Oral Histology MCQs
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After getting online registration through Army Official website, they have to clear Intelligence tests as well as academic tests.
Those candidates who has degree of BDS they must learn about the past tests of Oral Histology MCQs. Shaheen Forces Academy provides right direction for online registration, tests preparation, ISSB preparation material and even gives better guidelines for ISSB interview.
Candidates who have applied for Army Commission through Short Service Regular Commission, they must learn the following questions for passing initial academic tests.
In Pak Army, female can also apply through Short Service Regular Commission if they fulfil criteria. They will also become direct Captain and Major through Short Service Regular Commission.
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Oral Histology MCQs are given to Join Pakistan Army after MBBS & BDS
Which of the following is correct ?
A. Parotid – stenson’s duct – pure serous
B. Submandibular – Wharton’s duct – mixed and predominantly serous
C. Sublingual gland – bartholin’s duct – mixed and predominantly mucous
D. All of the above
Which of the following is correct?
A. Roof of mandible contains thin, compact bone
B. Articular tubercle is composed of spongy bone covered with thin compact bone
C. Condyle contains red bone marrow
D. All of the above
The components of future TMJ shows development at________?
A. 6 weeks
B. 18 weeks
C. 10 weeks
D. 16 weeks
Which of the following is true?
A. Cutting cone or resorption tunnel is the area of resorption seen in alveolar bone
B. CAMP or cyclic adenosine monophosphate levels are increased on pressure side of bone and this results in bone resorption
C. Immature born / embryonic bone seen during fracture healing contains less calcified material and greater number of large osteocytes
D. All of the above
Which of the following is true______?
A. All the bones of upper face develop by intra membranous ossification
B. Incus and malleus develops from mecketls cartilage
C. The third auditory ossicle or stapes develops from 2nd branchial arch
D. All of the above
Which of the following is not correct ?
A. In case of pituitary gigantis, all sinuses assume a larger volume than normal
B. In chronic infections, the pain may mimic neuralgia of dental origin
C. Malignant lesions of maxillary sinus produce their manifestations in maxillary teeth
D. None of the above
Which of the following is true?
A. Maxillary sinus communicates with environment through middle meatus and nasal vestibule
B. Maxillary sinus is four- sided pyramid
C. In most of the cases, the main ostium is present in posterior third of hiatus semilunar
D. All of the above
Which of the following is wrong?
A. The architecture of type I spongiosa is seen in mandible
B. Type II spongiosa is seen in maxilla
C. Condylar process & angle in mandible, and tuberosity in maxilla contain hemopoietic cellular marrow
D. Bundle bone contains a lesser amounts of calcium salts than other types of bony tissue
Which of the following is not true_______?
A. Alveolar bone proper surrounds the root and gives attachment to fibres of periodontal ligament
B. supporting alveolar bone surrounds the alveolar bone proper and supports the socket
C. The cortical plates are thinner in maxilla than in mandible
D. They are thickest in anterior portion of jaw
Which of the following is true_____?
A. Pulpal pressure is highest among body tissues
B. Majority of nerve that enter the pulp are non myelinated and are sympathetic in nature
C. Plexus of Rashkow or parietal layers of nerves is formed by network of peripheral axons located adjacent to cell rich zone
D. All of the above
Which of the following is not correct?
A. Free denticles are entirely surrounded by pulp tissue(free of dentin)
B. Embedded denticles are entirely surrounded by dentin (embedded in dentin)
C. Attached denticles are partly fused with dentin
D. False denticles contains many dentinal tubules
Which of the following is correct?
A. Fibronectin helps in attachment of fibroblasts to collagen
B. Cementicles are found in periodontal ligament of order individuals
C. The large nerve fibres are myelinated and are concerned with discerment of touch
D. The small nerve fibres may or may not be myelinated and are concerned with discrement of pain
E. All of the above
Myoepithelial cells are present in_______?
A. Striated duct
B. Intercalated & terminal duct
C. Serous cells
D. Mucous cells
Mucin in mucous cells usually demonstrated by_______?
A. PAP stain
B. H & E stain
C. Mucicarmine stain
D. Mallory stain
Which of the following is not present in saliva_______?
A. Lysozyme
B. Phosphate
C. Bicarbonate
D. Trypsin
The glands of Blandin and Nuhn are_______?
A. The posterior lingual glands
B. The anterior lingual glands located near the apex of tongue
C. The glossopalatine glands
D. The palatine glands
Pure mucous glands are_______?
A. Labial and buccal glands
B. Glosso palatine & palatine glands
C. Vonebners glands
D. Lingual glands
Vonebners gland are________?
A. glands at apex of tongue
B. Posterior lingual mucous glands
C. Posterior lingual serous glands
D. Glosso palatine glands
True about myoepithelial cell_______?
A. Also known as basket cell
B. Structure is similar to smooth muscle and contains actin & myosin
C. The cell expel secretions by contraction
D. All of the above
Bartholins duct is the name of________?
A. Parotid duct
B. Submandibular glands
C. Sublingual duct
D. Lacrimal duct
Wharton’s duct drains the_______?
A. Pancreas
B. Parotid
C. Lacrimal gland
D. Submandibular gland
Sublingual gland is a________?
A. Mixed gland
B. Serous gland
C. Mucous gland
D. Present in root of tongue
The content of saliva include all except____________?
A. Amylase
B. Urea
C. Lysoenzyme
D. Lipase
Of the total amount of saliva secreted by all the salivary glands, about 60% is secreted by the____?
A. Parotid glands
B. Sublingual glands
C. Submandibular glands
D. None of the above
Carmalt’s glands are_______?
A. Major salivary glands
B. Minor salivary glands (Retromolar)
C. Minor salivary gland ( lingual)
D. Taste Buds
The function of myoepithelial cells may be_______?
A. Initiating contraction
B. Support for the end piece during active secretion of saliva
C. Provide signals to the acinar secretary cells for structure organization
D. All of the above
An enzyme present in saliva which causes cell wall lysis_____?
A. Lysozhyme
B. Peroxidase
C. Lactoferin
D. Hyaluronidase
A purine which is found in saliva is_______?
A. Uric acid
B. Thymine
C. Adenosine
D. Hypolithinium
Acid neutralizing substance in saliva_________?
A. NH3
B. Carbonate
C. Bicarbonate
D. Chlorides
Total volume of saliva secreted by submandibular gland daily is__________?
A. 750 ml
B. 450 ml
C. 1500 ml
D. 1000 ml
Serous demilunes are seen in_______?
A. Salivary glands
B. Pancreas
C. Liver
D. Gastric glands
Main function of salivary duct is____?
A. To convey the saliva secreted by the terminal secretory units to oral cavity
B. Antibacterial action by secreting lysoenzymes and lactoferrin
C. Synthesis of secretory glycoproteins by Kallidrein an enzyme in striated duct cells
D. None of the above
Which of the following is correct about serous glands_______?
A. They are specialized for the synthesis, storage and secretion of proteins
B. They contain secretory granules in the apical Cytoplasm and the secretion of granule content occurs by exocrytosis
C. Serous cells are pyramidal in shape
D. All of the above
Saliva is secreted by_______?
A. Major salivary glands
B. Minor salivary glands
C. Major & minor salivary glands
D. Parotid gland
The duct(s) of gland(s) opening into the floor of the mouth is (are)____ _____?
A. Submandibular and sublingual
B. submandibular and parotid
C. Sublingual and parotid
D. Von Ebner
Among various glands, salivary gland secretion is unique in that, its secretions is unique in that, its secretion are controlled by______?
A. Hormones
B. Nerves
C. Chemicals
D. All of the above
The neutralization of saliva is due to_____?
A. Mucin
B. Ammonia
C. Amino acids
D. Bicarbonates
The normal pH of the saliva is about______?
A. 5.5
B. 9.5
C. 7.5
D. 8.5
Mandible develops by_______?
A. Endochondral ossification only
B. Membranous ossification only
C. Both of the above
D. None of the above
The marrow found in the mandible is______?
A. All fatty marrow
B. All red marrow
C. All fibrous marrow
D. A combination of fatty and fibrous marrow
Reversal lines which may be seen on the cribriform plate (alveolar bone proper) of the alveolar process indicate the cessation of____________?
A. Osteoblastic activity
B. Osteoclastic activity
C. Myeloid activity
D. Healing activity
Organ of chievity is seen near the______?
A. Medial surface of the mandible
B. Naso palatine foramen
C. Mental foramen
D. Foramen caecum
The maxillary sinus_______?
A. Opens in to the inferior meatus of nose
B. Has the 1st molar projecting into its floor
C. Is fully developed by the age of 8 years
D. Has good drainage in upright position
The type of epithelium lining maxillary sinus is______?
A. Simple columnar
B. Pseudo stratified columnar and cilliated
C. Stratified squamous
D. Simple squamous
Functional importance of maxillary sinus is______?
A. Lightening of skull weight and production of bactericidal lysozyme to the nasal cavity
B. Protects the brain against exposure to cold air by arresting air in sinus temporarily
C. Resonance of voice and enhancement of faciocranial resistance to mechanical shock
D. All of the above
The articular cartilage is characterized by all of the following features except______?
A. It is devoid of perichondrium
B. It has a rich nerve supply
C. It is avascular
D. It lacks the capacity to regenerate
The muscle which is commonly involved in myofacial pain dysfunction syndrome_______?
A. Lateral ptergoid
B. Massetor
C. Temporalis
D. Medial pterygoid
Fibres which continue from bone to ligament are_______?
A. Sharpey’s fibres
B. Tome’s fibres
C. Ray’s fibres
D. All of the above
Fibres which continue from bone to ligament are______?
A. Sharpey’s fibres
B. Tome’s fibres
C. Ray’s fibres
D. All of the above
Which of the following enzymes are involved in bone formation_______?
A. Alkaline phosphatase and urease
B. Catalase and phosphorylase
C. Alkaline phosphatase and phosphorylase
D. Acid phosphatase and catalase
When osteoblast lay new bone from outside to inside in a osteon, the active formation area is called______?
A. Haversion cone
B. Filling cone
C. Cutting cone
D. Howships cone
The intimal B cells of synovical memrbane of temporomandibular joint are_______?
A. Fibroblast like
B. Macrophage like
C. Lmphocyte like
D. Plasma cell like
Maxillary sinus is described as a four sided pyramid containing base, apex, roof and floor. The apex of maxillary sinus extends______?
A. Laterally into zygomatics process of maxilla
B. Medially into zygomatic process of maxilla
C. Laterally into lateral nasal wall
D. Superiorly into floor of orbit
The process of recesses formation in maxillary sinus is most frequently seen with______?
A. Zygomatic process
B. Frontal process
C. Alveolar process
D. Palatine process
Haversion systems (osteons) are found primarily in the________?
A. Spongy bone
B. Periosteum
C. Alveolar bone proper
D. Endosteum
Alveolar bone proper is also known as: or Which of the following is seen as lamina dura in an IOPA radiograph ?
A. Lamina lucida
B. Lamina densa
C. Lamina propria
D. Lamina dura
Basic metabolic unit of bone is_____?
A. Osteon
B. Osteoblast
C. Osteocyte
D. Osteoclast
Second arch derivatives are all except_________?
A. Stapes
B. Malleus and incus
C. Styloid process
D. Superior part of hyoid bone
The type of bone present in the labial area of anterior teeth is________?
A. Cortical
B. Cancellous
C. Osteophytic
D. Exophytic
The tooth present close to maxillary sinus is________?
A. 1st molar
B. 2nd premolar
C. 1st premolar
D. 2nd molar
Normal interincisal distance is_________?
A. 48 mm
B. 38 mm
C. 58 mm
D. 28 mm
The condyle of mandible is composed of_______?
A. Compact bone
B. Cancellous bone
C. Cancellous bone covered by thin layer of compact bone
D. Compact bone covered by cancellous bone
Role of meckel’s cartilage in development of mandible_______?
A. It has a major role
B. It has a minor role
C. It does not have any role
D. None of the above
Basal bone is_______?
A. That part of the bone embracing apices of root of teeth
B. Lower border of the mandible
C. Ramus of the mandible
D. That part of the bone containing teeth
Mature bone is otherwise called as______?
A. woven bone
B. Irregular bone
C. Lamellar bone
D. Resorbing bone
Bone at forming stage has_______?
A. Osteoclasts, osteoblasts, osteoid
B. Odontoblasts & megakaryocyte
C. Megakaryocytes, osteoblasts, osteoclasts
D. None of the above
Calcium content of lamina dura is______?
A. More than the other parts of alveolar bone
B. Less than the other parts of alveolar bone
C. Same as in other parts of alveolar bone
D. Less than the cementum
If a child’s teeth do not form, this would primarily effect the growth of the______?
A. Basal bone
B. Whole face
C. Mandible
D. Alveolar bone
Alveolar process helps in providing_____?
A. Support and retention to the complete denture
B. Boundaries for the tongue during speech
C. Attachment to muscles of facial expression
D. Support the natural teeth
The diameter of the largest arterial vessels in the pulp range from________?
A. 50-100 μm
B. 101-150 μm
C. 151-200 μm
D. 201-250 μm
Dystrophic calcifiaction is seen most commonly in which of the following oral tissues____?
A. Enamel
B. Pulp
C. Dentin
D. Periodontal ligament
Unmyelinated nerve fibres of pulp are_______?
A. Sensory in nature
B. Respond to hot and cold
C. carry pain sensation
D. Associated with blood vessels and are sympathetic in nature
Protein secreted by odontoblast______?
A. Chitin
B. Keratin
C. Collagen
D. Elastin
The development of pulp begins_____?
A. 6th week of IU
B. 8th week of IU
C. 10th week of IU
D. 18th week of IU
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Oral Histology MCQs for General Duty Dental Officers Tests
Regressive changes in pulp include_______?
A. Increased fibrotic component
B. Decreased cellular component
C. Calcification in blood vessels near apical foramen
D. All of the above
The 2nd most prominent cells in pulp are_______?
A. Fibroblasts
B. defense cells
C. Odontoblasts
D. Histocytes or resting wandering cell
The total volumes of all permanent pulp organ_______?
A. 0.38 cc
B. 0.58 cc
C. 0.02 cc
D. 3.8 cc
Aging process affects pulp tissue by_______?
A. Decreasing the size and shape of pulp tissue and cellular component
B. Increase cellular component at the expenses of fibre component
C. Increases vascularity of the pulp
D. Decrease the calcific component of the pulp
Pulp tissue contains all except_____?
A. Fibroblasts
B. Capillary
C. Osteoblasts
D. Ameloblasts
Propriceptors are seen in all except_______?
A. Skeletal muscle
B. TMJ
C. Pulp
D. None of the above
Pericytes are found______?
A. In thymus
B. Around capillaries of pulp
C. In gallbladder
D. Along with heparin on surface of mast cells
The cells of the dental pulp which are responsible for the deposition of reparative dentin are_________?
A. Osteoblasts
B. Odontoblasts
C. Ameloblasts
D. Osteocytes
The radicular pulp is continous with tissues of the periapical area via the______?
A. Pulp canal
B. Pulp chamber
C. Mental foramen
D. Apical foramen
Odontoblasts are derived from______?
A. Undifferentiated mesenchymal
B. Histocytes
C. Macrophages
D. Lymphocytes
Pulp responds to all stimuli by pain because it has only_______?
A. Free nerve endings
B. Krause end bulbs
C. Pacinian corpuscle
D. Ruffini corpuscle
The dental pulp contains nerve endings/receptors for______?
A. Pain
B. Pressure
C. Proprioception
D. Temperature
Pain originate in the pulp due to_________?
A. free nerve ending in cell rich zone
B. free nerve ending at sub odontoblastic layer
C. Krause bulb at the center of the pulp
D. Meisseners corpuscles at cell rich zone
Vitality of pulp depends on_______?
A. Blood supply
B. Nerve supply
C. Lymphatic supply
D. All of the above
The primary response of the pulp to tissue destruction is_______?
A. Necrosis
B. Ulceration
C. Calcific degeneration
D. Inflammation
The plexus of Rashkov is present in which of the following zones in pulp ?
A. Cell free zone
B. Cell rich zone
C. Odontoblastic zone
D. Pulp core
Size of pulp chamber________?
A. Increases with age
B. Decreases with age
C. Increased in some cases and decreases in some cases
D. None of the above
The average life time of primary pulp in oral cavity is_____?
A. 8.3 years
B. 2 years
C. 7 years
D. 3 years
The fibroblasts associated with capillaries are_____?
A. Plasma cell
B. Histocytes
C. Lymphocytes
D. Pericytes
The size of apical foramen of maxillary teeth in adult is_______?
A. 0.4 mm
B. 0.3 mm
C. 0.2 mm
D. 0.7 mm
The number of pulp organs in a person in______?
A. 32
B. 50
C. 52
D. 62
The cell free zone in pulp lies_____?
A. Above odontoblast
B. Below odontoblast
C. In radicular pulp
D. In pulp horn
Cells occurring in greatest number in pulp are_______?
A. Cementoblasts
B. Fibroblasts
C. Osteoblasts
D. Ameloblasts
The odontoblasts killed during cavity preparation are derived from_____?
A. Unaffected odontoblasts from the pulp
B. Undifferentiated cells
C. Histocytes
D. Osteoblasts
Histologically the dental pulp most closely resembles_______?
A. Nerve tissue
B. Vascular tissue
C. Granulation tissue
D. Loose connective tissue
The dental pulp is derived form_______?
A. Dental papilla
B. Dental sac
C. Odontoblasts
D. Stellate reticulum
Weil’s zone of pulp is______?
A. Cell degenerated zone
B. Cell rich zone
C. Cell regenerated zone
D. cell free zone
The primary function of the dental pulp is_____?
A. Nutritive
B. Production of dentin
C. Production of enamel
D. Vascular supply to the teeth
All of the following are true about functions of dental pulp except_______?
A. Formation of dentin
B. Nerve supply to dentin
C. Sends impulses to CNS
D. Nerve supply to enamel through fibres
Which of the following structures is not found in a living pulp ?
A. Collagen fibres
B. Haversian fibres
C. Non-myelinated nerve fibres
D. Reticulum
In a dried skull, holes on the lingual aspects of the deciduous teeth are called______?
A. Volkmann canals
B. Canals of Hirchfeld and Zuckerland
C. Herversian canals
D. Gubernacular canals
The type of bone present in the labial area of anterior teeth is______?
A. Cortical
B. Cancellous
C. Osteophytics
D. Exophytic
Width of PDL is________?
A. 0.10 mm
B. 0.50 mm
C. 0.25 mm
D. 0.75 mm
The periodontal ligament is approximately________?
A. 0.25 mm in thickness
B. 0.5 mm in thickness
C. 0.75 mm in thickness
D. mm in thickness
Development of supporting tissues of the tooth is initiated by_______?
A. Cells of dental follicle
B. Cells of odontogenic layer
C. Cementoblasts
D. Cells of the gingiva
Width of the periodontal ligament is least at_______?
A. Cervical third
B. Apical third
C. Fulcrum of rotation
D. It has uniform width
Cementicles are found in the________?
A. Gingiva
B. Periodontal ligament
C. Alveolar bone
D. Cementum
Periodontal ligament is made up of_______?
A. Type I collagen
B. Type I and Type III collagen
C. Type I and Type II collagen
D. Type I and Type IV collagen
Interdependency of osteoblasts and osteoclasts in bone remodeling is called as_______?
A. Lacunae
B. Coupling
C. Reversal lines
D. Canaliculi
Periodontal fibres joining cemental surface of one tooth, to cemental surface of adjacent tooth are called____________?
A. Gingivodental
B. Cemental fibres
C. Horizontal fibres
D. Transseptal fibres
Sharpey’s fibres are derived from_______?
A. Hertwig’s root sheath
B. Epithelial rests of malassez
C. Alveolar bone
D. Dental follicle
Periodontal ligament has predominantly_______?
A. Type II collagen fibres
B. Oxytalan fibres
C. Elastic fibres
D. Type I collagen fibres
Which of the following groups of fibres are not attached to alveolar bone ?
A. Transseptal
B. Horizontal
C. Oblique
D. Apical
The most abundant principle fibre group in periodontal ligament is_______?
A. Horizontal
B. Transeptal
C. Apical
D. Oblique
In mammals independent and tough suspension for teeth is provided by________?
A. Alveolar sockets
B. Cementum
C. Gubernacular cords
D. Periodontal membrane
Group of fibres, which resist the masticatory forces_______?
A. Dentogingival
B. Transeptal
C. Oblique
D. Horizontal
Fibres of periodontal ligament embedded in the bone are_______?
A. Sharpey’s fibres
B. Tomes fibres
C. Elastic fibres
D. Ray’s fibres
The attached apparatus of tooth is composed of_____?
A. Gingiva, cementum and alveolar bone
B. Gingiva and cementum
C. Cementum and periodontal ligament
D. Peridontal ligament the cementum and the alveolar bone
Age changes in periodeontal ligament include which of the following ?
A. Increased fibroplasia
B. Increased vascularity
C. Increased thickness
D. Decreased in number of cementicles
Collagen molecule exhibits all of the following features except_____?
A. Triple pleated sheath
B. Mostly contains glycine residues
C. Exhibit cross striations at 64 μm
D. Intracellular in nature
Which of the following is not the principle fibre group of the periodontal ligament______?
A. Horizontal
B. Oblique
C. Alveolar crest
D. Transseplat
A special feature of the periodontal ligament fibroblasts is_______?
A. The number or organelles
B. Presence of actin fibres and shape change
C. size of the cells
D. Collagen fibre formation
The component of future T.M.J shows development at ______?
A. 6 weeks
B. 10 weeks
C. 18 weeks
D. 16 weeks
Centre of the disc in TMJ is_______?
A. Avascular
B. Devoid of nervous tissue
C. Avascular & deviod of nervous tissue
D. None of the above
Narrowing of periodontal ligament in labially placed mandibular canine with age is due to_____?
A. Due to deposition of cementum and bone
B. Down growths of gingival epithelium
C. Gingival cysts formed from cell rests
D. Reversal of function of horizontal and oblique fibres
The main function of horizontal fibres of P.D ligament is_________?
A. Prevent extrusion
B. Prevent rotation
C. Maintains the mesiodistal width
D. All of the above
The rest of malassez in the periodontal ligament are derived from______?
A. Dental pulp
B. Lamina propria
C. Odontogenic epithelium
D. Vestibular lamina
The most abundant group of fibres in the PDL are_______?
A. Trans-septal
B. Horizontal
C. Oblique
D. Apical
True about osteoclasts________?
A. Monocytes are precursor cells of osteoclasts
B. The plasma membrane of osteoclasts adjacent to bone that is being resorbed is known as striated or ruffled border
C. Contain lysosomes with acid phosphates
D. All of the above are true
Sharpey’s fibres are present in_______?
A. Bone
B. Periosteum
C. Periodontal ligament
D. All of the above
Intermediate plexus is absent in which of the following principle fibres_______?
A. Gingival
B. Oblique
C. Horizontal
D. Transseptal
The calcified mass found in the PDL are_______?
A. Cementicles
B. Osteoblasts
C. Cementoclasts
D. Osteoclasts
Principal fibres of periodontal ligament are attached to_______?
A. Alveolar bone proper
B. Bundle bone
C. Lamellar bone
D. Cortical bone
Collagen biosynthesis occurs inside the______?
A. Chondroblasts
B. Odontoblasts
C. Osteoblasts
D. Fibroblasts
Bone adjacent to periodontal ligament that contains a great number of sharpey’s fibres is known as_____?
A. Lamina dura
B. Bundle bone
C. Lamina propria
D. Lamina densa
Intermediate plexus is seen in the______?
A. Cementum
B. PDL
C. Pulp
D. Dentin
The vascular supply of the periodontal ligament is______?
A. Greatest in the middle-third of a single rotted tooth
B. Greatest in the middle-third of a multirooted tooth
C. A net like plexus that runs closer to the cementum than to the bone
D. A net like plexus that runs closer to the bone than to the cementum
All of the following cells of periodontal ligament are of mesenchymal origin except_______?
A. Fibroblasts
B. Multi totipotent cells
C. Cementoblasts
D. Cell rests of malassez
Remnants of the Hertwig’s root sheath are found in___?
A. Gingiva
B. Alveolar bone
C. Periodontal ligament
D. Cementum
Anchoring fibrills are composed of_______?
A. Type V and VII collagen
B. Type I and III collagen
C. Type IV collagen
D. Type IV and III Collagen
The periodontal ligament______?
A. Derives its blood supply primarily from the branches of vessels entering the pulp
B. Has a slow rate of turn over
C. Contains epithelial cells
D. Comprises primarily of type II collagen
Which dental tissue doesn’t contain nerves ?
A. Bone
B. Dentin
C. Cementum
D. Pulp
Which of the following is least mineralized ?
A. Cementoid
B. Incremental line
C. Cellular cementum
D. Acellular cementum
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MCQs on Oral Histology to Join Pakistan Army as a Captain Doctor or Dental Surgeon
Root lengthening is contributed by_______?
A. Cellular cementum
B. Acellular cementum
C. Intermediate cementum
D. All of the above
Trauma or excessive occlusal forces causes________?
A. Hyperplasia of cementum
B. Hypertrophy of cementum
C. Resorption of cementum
D. None of the above
At the CEJ cementum overlaps enamel about_______?
A. 55 to 60%
B. 60 to 65%
C. 65 to 70%
D. 70 to 75%
Cementum is_______?
A. Avascular
B. Vascular
C. Has blood supply initially only
D. None of the above
If overgrowth of cementum does not improve the functional qualities of cementum, it is termed as_______?
A. Hyperplasia
B. Hypoplasia
C. Hypertrophy
D. Excementoses
Intermediate cemental layer_______?
A. Does not exhibit features of either dentin of cementum
B. Predominantly seen in apical tow thirds of roots of molars and premolars and is rare in incisors or deciduous teeth
C. Represents area of entrapment of hertwig’s sheath in dentin or cementum
D. All of the above are correct
Cementum that forms in conjunction with root end formation and eruption___?
A. Cellular cementum
B. Acellular cementum
C. Both of the above
D. None of the above
Which of the following is a rare occurrence_____?
A. Enamel meet cementum at a point
B. Enamel overlaps cementum
C. Cementum overlaps enamel
D. Both never meet
Maximum fluoride content is seen in______?
A. Dental cementum
B. Dental pulp
C. Enamel
D. Dentin
Secondary cementum is generally confined to______?
A. Cervical third of the root
B. Middle third of the root
C. Apical third of the root
D. No secondary cementum forms
Cellular cementum and compact bone contain______?
A. Sharpehy’s fibres and elastic fibres
B. Collagen fibres and blood vessels
C. Canaliculi and incremental lines
D. Lacunae and elastic fibres
Cellular cementum is________?
A. First formed cementum
B. Less calcified than acellular type
C. More calcified than acellular type
D. Less irregular
Bundle bone is part of_____?
A. Periodontal ligament
B. Alveolar bone
C. Cementum
D. Longbones
Hardness of fully mineralized cementum is_______?
A. Less than dentin
B. More than dentin
C. Equal dentin
D. None of the above
Which of the following is true of cellular cementum ?
A. Forms during root formation
B. Forms after the eruption of the tooth
C. Seen at the coronal portion of the tooth
D. Formation is a slow process
The cementuoenamel junction is approximately at the level at which the root canal becomes______?
A. Twisted
B. Curved
C. Pulp chamber
D. Lateral canal
Intermediate cementum is_____?
A. Highly defined cellular zone near cemento – dentinal junction (CDJ)
B. Highly defined fibrillar zone near CDJ
C. Poorly defined zone near cemento-dentinal junction
D. Both a and B
Inorganic content of cementum is______?
A. 45 to 50%
B. 50 to 55%
C. 55 to 60%
D. 60 to 65%
The region in which cementum formation is most rapid is______?
A. Middle
B. Coronal
C. Apical
D. Interradicular
Which of the following statement is true____?
A. Cementum is thinnest at CEJ (20-50μm)
B. Cementum is thickest towards the apex (150-200μm)
C. The apical foramen is surrounded by cementum
D. All of the above
Reestablishing the former outline of the root surface is______?
A. Anatomic repair
B. Functional repair
C. Physiological repair
D. Hyperplasia
Intermediate cementum is_______?
A. Between enamel and cementum
B. Found at dentinocemental junction
C. Apical third
D. Coronal third
Which of the following is correct?
A. Cementum is more resistant to resorption than bone
B. Bone is more resistant to resorption than cementum
C. Both are equally resorbable
D. None of the above
Chronic periapical inflammation is usually associated with_____?
A. Ankylosis
B. Resorption of cementum
C. Hypertrophy of cementum
D. Hyperplasia of cementum
If cementum is not formed____?
A. Ankylosis may occur
B. Exforliation of teeth occur
C. Delayed eruption
D. No change occurs
Which of the following is true_______?
A. The uncalcified matrix of cementum is called cementoid
B. Cementum contain type I collagen predominantly
C. Cementodentinal junction is sometimes scallopes in deciduous teeth and smooth in permanent teeth
D. All of the above
Acellular cementum is typically found in_____?
A. Coronal half of root
B. Apical half of root
C. Apex of root
D. Entire root
At the cemento enamel junction, which of the following occurs_____?
A. Cementum meets enamel
B. Cementum overlaps enamel
C. Cementum does not meet enamel
D. All of the above
Inorganic content of cementum is_______?
A. Less than bone
B. More than bone
C. Equal to that of bone
D. More than that of enamel
Butt joint in cementoenamel junctions seen is ______% of cases?
A. 10%
B. 30%
C. 60%
D. 90%
Cementum______?
A. Is derived from the sheath of hertwig
B. Is acellular in the apical third of the tooth
C. Often overlaps the enamel
D. Does not contain collagen fibres
Which of the following is correct?
A. Reparative dentin is characterized by having fewer and more twisted tubules than normal dentin and may include odontoblasts
B. Dead tracts appear black in transmitted and white in reflected ligth
C. Sclerotic transparent dentin appears transparent or light in transmitted light and dark in reflected light
D. All of the above
Matrix vesicles________?
A. Are found in mantle dentin
B. Contain collagen
C. Produce alkaline phosphatase
D. Inhibit mineralization
One of the following statement is unique about circumpulpal dentine_____?
A. Collagen fibers are oriented perpendicular to DEJ
B. Vonkorff fibers are present
C. Contain phosphophoryn
D. Requires matrix vesicle for mineralization
The most accepted theory for dentin sensitivity is: or Which of the following is the most accepted theory of transmission of dental sensation_______?
A. Transduction theory
B. Direct neural stimulation
C. Hydrodynamic theory
D. Hydrostatic theory
In adult teeth, the type of dentin present underlying dentin-enamel junction is________?
A. Predentin
B. Mantle dentin
C. Interglobular dentin
D. Tertiary dentin
Fluid flow, in or out of the dentinal tubules is proportional to the tuble diameter by_______?
A. Third power of the diameter
B. Sixth power of the diameter
C. Square of the diameter
D. Fourth power of the diameter
The formation of which of the following does not represent normal physiologiacl process of dentin formation______?
A. Primary and secondary dentin
B. Secondary dentin and circumpulpal dentin
C. Tetiary dentin and sclerotic dentin
D. All of the above
Regarding teeth which statement is wrong ?
A. Enamel is harder than dentine
B. Enamel has no cells
C. Ameloblast secrete enamel and dentine
D. Odontoblast produce dentin
Excess deposition of calcium in the dentinal tubules is referred to as_____?
A. Sclerotic dentin
B. Mantal dentin
C. Interglobular dentin
D. Intertubular dentin
1st formed dental tissue_______?
A. Enamel
B. Dentin
C. Cementum
D. Bone
The pain transmission through dentin is_______?
A. Direct neural stimulation
B. Fluid or hydrodynamic theory
C. Transduction theory
D. All of the above
The type of dentin that is formed prior to root completion_______?
A. Inter tubular dentin
B. Peritubular dentin
C. Circum pulpal dentin
D. Secondary dentin
Organic portion can be separated from the mineral by_____?
A. Incineration/organic chelation
B. Decalcification
C. Devitrification
D. Combustion
Shape of crown and the size of the roots is determined by_______?
A. Pulp
B. Dentin
C. Enamel
D. Cementum
Sclerotic dentin has following features____?
A. Caries susceptible
B. Insensitive
C. Hypersensitive
D. Resistant to caries
Inter globular dentin results due to_____________?
A. Failure of coalescence of calcospherities
B. Fracture of the dentin
C. Artifact in light microscopy
D. Disturbance in dentinal tubules
The main bulk of dentin is formed by_______?
A. Peritubular denti
B. Mantle dentin
C. Inter tubular dentin
D. Predentin
Tome’s firbres are______?
A. With out but not with in the dentin
B. Odontoblastic processes in dental tubules
C. Type of sharpey’s fibres
D. Originate from tome’s granular layer
Korffs fibres are seen in______________?
A. Mantle dentin
B. Secondary dentin
C. Reactionary dentin
D. Indeed dermal tubules
The type of tertiary dentin which contains cellular inclusions is found in______?
A. Sclerotic dentin
B. Mantle dentin
C. Predentin
D. Osteodentin
The organic lining of the calcified dentinal tubules is known as________?
A. Lamina propria
B. Lamina lucida
C. Lamina limitans
D. Lamina densa
The cells that form secondary dentin are______?
A. Cementoblasts
B. Fibroblasts
C. Odontoblasts
D. Osteoblasts
Which of the areas of the tooth is most sensitive during cavity preparation ?
A. Enamel (anterior teeth)
B. Enamel (Posterior teeth)
C. Dentin
D. Dentinoenamel junction
Transmission of stimulus across dentin is_______?
A. Direct activation of nerve endings
B. Correlated with the innervation density of the dentin
C. Stimulus induced fluid flow
D. There is no transmission of stimulus across dentin
During the formation of primary teeth_______________?
A. Enamel forms more cervically than dentin
B. Enamel forms faster than dentin
C. Dentin forms faster than enamel
D. Processes of their cells remain in content with each other
Compared to the inter tubular dentin, peritubular dentin is characterized by which of the following ?
A. Greater stainability
B. Lasser content of inorganic salts
C. greater content of inorganic salts
D. Greater content of large collagen fibres
All factors govering dentine permeability EXCEPT_________?
A. Smear layer
B. Fluid convection
C. Length of dentinal tubules
D. Diffusion coefficient
The average diameter of coronal dentinal tubules near the pulp is______?
A. 0.2-0.5 microns
B. 2-3 microns
C. 0.2-0.3 microns
D. 7 microns
All of the following is true about dentinal tubules except________?
A. Inner pulpal layer contains more dentinal tubules than outer dentin layer
B. The diameter of dentin tubules ranges from 5 to 7μm
C. The diameter of dentinal tubule is more at pulpal layer than outer layer
D. The bonding is more on the inner layer of dentin compared to outer surface
S shape of dentinal tubules is due to________?
A. Incremental deposition
B. Peritubular dentin
C. Crowding of odontoblasts
D. Due to excess amount of organic component
Dentin formed through out the life is______?
A. Sclerotic dentin
B. Secondary dentin
C. Reparative dentin
D. All of the above
Dentinal tubules are calcified in______?
A. Sclerotic dentin
B. Primary dentin
C. Secondary dentin
D. Interglobular dentin
Which of the following is correct?
A. Each rod is formed by 4 ameloblasts
B. Each ameloblast contributes to 4 different rods
C. Head of the rod is formed by one ameloblasts, and tail is formed by three other ameloblasts
D. All of the above
Accentuated incremental lines in dentin due to disturbances in matrix and mineralization process is_____?
A. Incremental lines of retzius
B. Incremental lines of vonebner
C. Contour lines of owen
D. None of the above
Formula of hydroxyapatite crystal is______?
A. Ca3 (Po4)2 CaCo3
B. 3Ca (Po4)2 Ca(OH)2
C. CaPo4 Ca(OH)2
D. None of the above
Physically and chemically, the dentin is closely related to______?
A. Bone
B. Acellular cementum
C. Enamel
D. None of the above
Which of the following statement is correct?
A. Enamel cannot form in absence of dentin
B. The formation of enamel and dentin are independent of each other
C. Enamel formation can occur in absence of dentin
D. None of the above
The microhardness of dentin is about_______?
A. 1/2 that of enamel
B. 1/7 that of enamel
C. 1/4 that of enamel
D. 1/5 that of enamel
Dentinogenesis by odontoblasts first begins at_______?
A. Pulpal end
B. Cusp tip
C. Tooth bud stage
D. Cervical area
The zone of dentin most recently formed and uncalcified is known as_____?
A. Mantle dentin
B. Circumpulpal dentin
C. Predentin
D. Secondary dentin
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The dentin receptors are unique because_______?
A. They elicit pain to hot and cold
B. They elicit pain to touch and pressure
C. They elicit pain to chemicals
D. Elicit only pain as a response
Mirgration of odontoblasts into dentinal tubules occurs during _______?
A. Cavity preparation
B. Dehydration
C. Water irrigation
D. None of the above
The dentin adjacent to the dentinoenamel junction is called the______?
A. Mantle dentin
B. Circumpulpal dentin
C. Predentin
D. Secondary dentin
Which of the following dentinal layers is more mineralized_______?
A. Peritubular dentin
B. Inter tubular dentin
C. Dentinal tubules
D. Circum pulpal dentin
Dead tracts in ground section appears as_____?
A. Dentinal tubules
B. Coarse fibril bundles arranged at right angle to the dentinal surface
C. Black in transmitted light and white in reflected light
D. White in transmitted light and dark in reflected light
Dentinal tubules are_______?
A. Concave
B. Straight
C. S0shaped
D. None of the above
Dental lamina is active up to________?
A. 1 year
B. 2 years
C. 3 years
D. 4 years
Ectodermal cells in tooth bud are responsible for________?
A. Determination of shape of crown and root
B. Formation of periodontal ligament
C. Formation of cementum
D. Formation of pulp
In considering the process of eruption, the pre-functional eruptive stage of a tooth begins when the______?
A. Bud stage begins
B. Cap stage begins
C. Bell stage begins
D. Dental lamina begins forming
Hertwig’s epithelial root sheath is made up of_____?
A. Outer and inner enamel epithelium
B. Stratum intermedium
C. Stellate reticulum
D. Hyaline layer of Hopewell-smill
Following is derivative of dental lamina_______?
A. Epithelial rests of Malassez
B. Enamel pearls
C. Rests of serrae
D. All of the above
Accessory canals result from____?
A. Defects in cementogenesis
B. Dividing epithelial bridges
C. Break in Hertwig’s root sheath
D. Adherent epithelial rests
A supernumerary tooth results from a deviation during______?
A. Initiation
B. Differentiation
C. Apposition
D. Calcification
Blood supply of ameloblast for most of its life cycle comes form_____?
A. Dental papilla
B. Reduced enamel organ
C. Dental Sac
D. Dental pulp
The successors of deciduous teeth develops form______?
A. Successional lamina
B. Dental lamina
C. Stellate reticulum
D. Neutral ectodermal cells
Outer and inner enamel epithelium first seen in_____?
A. Bud stage
B. Advanced bell stage
C. Cap stage
D. Bell stage
High levels of albumin is present in_____?
A. Inner enamel epithelium
B. Outer enamel epithelium
C. Stellate reticulum
D. Stratum intermedium
Membrana performative is seen in_________?
A. Bell stage
B. Cap stage
C. Bud stage
D. Advanced bell stage
Any insult to cells in apposition stage result in________?
A. Hutchinson’s incisor
B. Osteodentin formation
C. Enamel hypoplasia
D. Anodontia
Cementum formation is seen____?
A. After dentin formation
B. Before dentin formation
C. Both are formed at same time
D. None of the above
Morphological stages of tooth development are explained based on_____?
A. Shape of enamel organ
B. Shape of tooth germ
C. Function of enamel organ
D. Shape of dental papilla
Tooth develops from_____?
A. Ectoderm, mosoderm
B. Ectoderm
C. Mesoderm
D. Ectoderm and endoderm
The relationship between the pulpal and periodontal tissue complex begins during dental development at______?
A. Adolescent stage
B. 5-10 years
C. Embryonic stage
D. None of the above
The cells of the enamel organ which differentiate into future ameloblasts are_______?
A. Cells of inner enamel epithelium
B. Cells of outer enamel epithelium
C. Cells of stellate reticulum
D. Cells of stratum intermedium
The cap stage in tooth development is characterized by_____?
A. morphodifferentiation
B. reversal of functional polarity
C. Formation of hammock ligament
D. Increased mitotic activity
In cap stage, regulating factor for cusp shape formation is present in______?
A. Dental papilla
B. Dental follicle
C. Inner enamel epithelium
D. Enamel Knot
Which of the following is not an ecto-mesenchymal derivative ?
A. Dentin
B. Cementum
C. Pulp
D. Enamel
The disturbances occurred during Calcification stage of tooth development is seen in______?
A. Peg laterals
B. Microdontia
C. Supernumerary tooth
D. Interglobular dentin
Stellate reticulum is seen in___?
A. Dental lamina
B. Enamel organ
C. Hertwig’s root sheath
D. All of the above
Order of development of tooth germ is_______?
A. Bell-bud-cap
B. Cap-bell-bud
C. Bud-cap-bell
D. Bell-cap-bud
Atypical or osteodentin is formed due to disturbance during______?
A. Morphodifferentiation
B. Histodifferentiation
C. Apposition
D. Initiation
Enamel pearls are found in_______?
A. Occlusal surface of premolars
B. Furcation areas of permanent molars
C. On the incisal edges of incisors
D. None of the above
Nutrition for ameloblasts after 1st layer of enamel is laid is______?
A. Dental sac
B. Odontoblastic process
C. Ree
D. Dental Papilla
Temporary structures in enamel organ are (before enamel formation) ?
A. Enamel knot
B. Enamel cord
C. Both A and B
D. Enamel Cuticle
Lip furrow band is______?
A. Vestibular lamina
B. Successional lamina
C. Dental lamina
D. Basal lamina
Which of the following anomalies occur during the initiation and proliferation of tooth development ?
A. Amelogenisis imperfecta
B. Dentinogenesis imperfecta
C. Enamel hypoplasia
D. Oligodontia
The hertwig’s epithelial root shealth is essential to development of the root because it________?
A. Gives rise to cementoblasts that produce cementum of the root
B. Moulds the shape of roots and stimulates differentiation of odontoblasts
C. Given rise to odontoblasts that lay down dentin of the root
D. Remians as an essential constituents of the periodontal ligament
The formation of the dental lamina is initiated by______?
A. Forebrain
B. Rathke’s pouch
C. Neural crest cells
D. Odontoblasts
In multirooted teeth, formation of multiple roots is due to presence of______?
A. Epithelial diaphragm
B. Cell rests of Malassez
C. Toot bud division or bell stage
D. None of the above
First appearance of tooth formation occurs in______?
A. 6th week IU
B. 2nd week IU
C. 9th week IU
D. 4th week IU
Disturbance during the morphodifferentition stage of tooth development will result in______?
A. Change in number of teeth
B. Ameloblastoma
C. Change in form and shape of the teeth
D. Hypoplasia
Dental papilla gives rise to_____?
A. Pulp only
B. Pulp & Dentin
C. Pulp & Periodontal ligament
D. All of the above
The bud, cap and bell stage of the developing tooth are based, on growth of the______?
A. Stellate reticulum
B. Dental papilla
C. Enamel organ
D. Dental sac
Enamel can act in a sense like a______?
A. Permeable membrane
B. Impermeable membrane
C. Semipermeable membrane
D. Infrapermeable membrane
Dark bonds that are present in enamel rods at intervals of 4 μms are_______?
A. Neonantal bands
B. Cross striations
C. Striae of Retzius
D. Hunter-Schregar bands
The average width of enamel rods is______?
A. 10mm
B. 5mm
C. 2mm
D. 0.5mm
The shallow furrows on the enamel surface, where stria of Retzius end are known as __ ?
A. Cracks
B. Pellicle
C. perikymata
D. Enamel lamellae
The key hole, pattern appearance in the cross section is feature of______________?
A. Aprismatic enamel
B. Prismatic enamel
C. Intertubular dentin
D. Intratubular dentin
The class of low molecular weight calcium binding proteins seen predominantly in developing enamel are______?
A. Enamelin
B. Amelogenin
C. Tuftelin
D. Ameloplakin
Metalloprotienases are used in which stage of the amelogenesis_____?
A. Organising
B. Formative/ Secretory
C. Protective
D. Desmolytic
Nutritional supply of the ameloblasts during most of their life cycle is from the______?
A. Dental pulp
B. Odontoblastic processes
C. Dental sac
D. Reduced dental organ
Neonatal line is also referred to as______?
A. Retzius line
B. Line of cross striations
C. Incremental lines
D. Line of enamel tufts
Among the following the structure that is most calcified is______?
A. Enamel lamella
B. Enamel rod
C. Enamel spindle
D. Enamel tuft
Synthesis of enamel matrix proteins occurs in the_____?
A. Outer enamel epithelium
B. Ameloblast
C. Stratum intermedium
D. Stratum granulosum
Enamel is laid down_____?
A. Mainly by odontoblasts
B. Mainly by ameloblasts
C. Only on odontoblasts
D. Only by ameloblasts
The striking difference between enamel and other mineralized tissues is_______?
A. Presence of high percentage of organic matrix
B. Presence of incremental lines
C. Enamel has high reparative capacity
D. Most of organic component is lost during mineralization
Formation of dentin by odontoblasts begins in______?
A. Morphogenic stage
B. Organizing stage
C. Desmolytic stage
D. Formative stage
Chronological hypoplasia is___?
A. Hypoplasia of local origin
B. Hypoplasia of systemic origin
C. Hypoplasia of hereditary origin
D. None of the above
Dentino enamel junction is______?
A. Non-scalloped
B. Straight
C. Scalloped and the convexities are directed towards dentin
D. Scalloped and the convexities are directed towards enamel
True about direction of enamel rods______?
A. They originate at right angle to dentin surface
B. They are almost vertical near the incisal edge (or) cusp tip areas
C. In the cervical third of deciduous crowns they are almost horizontal in direction
D. In cervical region of permanent teeth, they deviate in apical direction
E. All of the above
The diameter of the rod is_____?
A. 4 μ m
B. 9 μ m
C. 7 μ m
D. 2 μ m
Inorganic content of enamel is about_______?
A. 35%
B. 50%
C. 4%
D. 96%
Calcification in enamel starts at______?
A. Enamel matrix
B. Root
C. CEJ
D. DEJ
The enamel has no capacity of self repair because_______?
A. It has only a small percent of organic content
B. Its formative cells are lost once it is completely formed
C. It is essentially a keratin tissue and has no blood vessels
D. It has no direct connection with the active cells of the dental pulp
The formative cells of which of the following dental tissues disappear once tissue is formed______?
A. Enamel
B. Dentin
C. Periodontal ligament
D. Cementum
On microscopic examination enamel rods have______?
A. Key hole appearance in cross section
B. Paddle appearance in cross section
C. Lanullate appearance in cross-section
D. None of the above
All are true about the striae of retzius except______?
A. Constitute the rest lines with in the enamel rods
B. Have high inorganic content
C. They are areas of increased porosity
D. Allow the movement of water and small ions
Ionic exchange between enamel surface and environment______________?
A. Does not take place once enamel surface and environment
B. Stops after 2 years of eruption
C. Continues till adult life
D. Continues through out life
Incremental lines of retzius are seen in_______?
A. Enamel
B. Dentin
C. Cementum
D. Pulp
Blunt cell processes seen on the developing ameloblasts are celled as______?
A. Tomes fibres
B. Tomes layer
C. Tomes processes
D. Odontoblastic processes
Following is not an external manifestation of enamel______?
A. Enamel tufts
B. Enamel lamella
C. Incremental lines of enamel
D. Enamel cuticle
Hunter Schreger band are______?
A. Dark and light bands of enamel seen in longitudinal ground section
B. Dark and light bands of enamel seen in horizontal ground section
C. Dark and light brands of dentin seen in longitudinal section
D. Dark and light bands of dentin seen in horizontal
The percentage of inorganic matter in fully developed enamel is about_______?
A. 66%
B. 76%
C. 86%
D. 96%
Non acidic, nonionic protein which helps in enamel mineralization ________?
A. Tuftelin
B. Sheathlin
C. Enamelin
D. Amelogenin
Which of the following is correct about enamel crystals ?
A. Same as dentin crystals
B. Contains organic portion in the center
C. Roughly texagonal in shape
D. Their diameter is about 5 microns in size
Maximum amount of phosphate is seen in______?
A. Bone
B. Enamel
C. Gingiva
D. Dentin
Neonatal lines are seen in______?
A. Enamel of deciduous incisiors
B. Enamel of permanent incisors
C. Enamel of premolars
D. Dentin of all teeth, as if is formed first
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Narled enamel is seen in______?
A. Proximal surface of tooth
B. Cervical region of tooth
C. Cusp tips of tooth
D. All of the above
The thickness of prismless enamel in deciduous teeth is______?
A. 25 μ m
B. 50 μ m
C. 75 μ m
D. 100 μ m
Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are________?
A. Straight
B. Shallow
C. Bent
D. Curved
Incremental lines of Retzius appear______?
A. As lines in the enamel running at right angles to the enamel surface
B. As lines in the dentin running at right angles to the dentino-enamel junction
C. In enamel and follow the apposition pattern
D. In dentin and follow the appositional pattern
Enamel spindles are formed by_______?
A. Cracks
B. Ameloblasts
C. Odontoblasts
D. Hypocalcified rods
The small ridges, perikymata, seen on facial surfaces of canines are the result of______?
A. Hyperplasia
B. Hypoplacification
C. Normal development
D. Interstitial development
Ameloblasts is________?
A. A cell from which tooth enamel is formed:
B. A tissue from which tooth erupts
C. A tumour of the jaw
D. Pertaining to dentin
Shape of enamel rod is____?
A. Key hole or paddle shaped
B. Square
C. Round
D. None of the above
Moth eaten appearance of of enamel is seen in_______?
A. Odontodysplasia
B. Amelogenisis stage
C. Desmolytic stage
D. Mottled enamel
Hertwig’s root sheath is formed from____?
A. Stratum inter medium
B. Stellate reticulum
C. Outer enamel epithelium
D. Cervical loop
Thin leaf like structures that extend from enamel surface in to DEJ are_______?
A. Enamel spindles
B. Enamel lamella
C. Enamel tufts
D. Perikymata
Which of the following statement is correct________?
A. In cross sections enamel rods appear hexagonal and resembles fish scales
B. The bodies of rods are near occlusal and incisal surfaces, where as the tails point cervically
C. The apatite crystals are parallel to bodies and deviate 65° from the tails
D. All of the above
Length of enamel rods is____?
A. Greater than the thickness of enamel
B. Less than the thickness of enamel
C. Equal to the thickness of enimal
D. None of the above
Specific gravity of enamel is________?
A. 2.8
B. 3.8
C. 4.8
D. 2.3
The type of fibrous element in enamel is_____________?
A. Tono filament
B. Keratin like fibre
C. Collagen fibre
D. Vimentin filament
Which of the following tissues have no reparative capacity_____?
A. Enamel
B. Dentin
C. Cementum
D. Periodontal ligament
Which of the following structures is not of ectodermal origin_______?
A. Hunter schreger bands
B. Enamel spindles
C. Enamel tufts
D. Enamel lamellae
Neonatal lines are found in all of the following except_____?
A. Enamel of primary incisors
B. Enamel of permanent canines
C. Enamel and dentin of permanent first molars
D. Dentin of permanent mandibular incisors
Approximately how many enamel rods will be present in a maxillary molar ?
A. 5 million
B. 7 million
C. 9 million
D. 12 million
All are true regarding the enamel spindles except______?
A. Produced by ameloblasts
B. Found in the region of cusps
C. Surrounded by inter prismatic enamel
D. Terminate as rounded process
Interwining of the enamel rods at the cusp timps and the incisal edges of a tooth is called_______?
A. Enamel spindles
B. Gnarled enamel
C. Incremental lies of woven
D. Incremental lines of retzius
Ratio of diameter of enamel rods in the DEJ to the enamel surface is________?
A. 1:4
B. 1:1
C. 1:2
D. 2:1
Enamel tufts are_______?
A. Thin tuft like structure extending from enamel surface of dentin enamel junction
B. Tuft like structure arising from dentin-enamel junction towards enamel surface
C. Odontoblastic processes extending into enamel
D. None of the above
The enamel of the posterior teeth is thickest at_____?
A. Cervical third of buccal surface
B. Middle third of buccal surface
C. Middle third of lingual surface
D. Occlusal surface
perikymata are the external surface manifestations of_____________?
A. Enamel rods
B. Incremental lines of retzius
C. Nasmyth’s membrane
D. Pellicle
Which of the following statement is false______?
A. Resorption of roots of deciduous incisors and canines begins on their lingual surfaces
B. Resorption of roots of deciduous molars begins on their inner surfaces
C. Shedding of deciduous teeth is delayed in the absence of their successor teeth
D. None of the above
Which of the following is correct______?
A. Non-keratinized epithelium is characterized by absence of stratum granulosum and stratum corneum, The surface cells are nucleated
B. Parakeratinished epithelium is characterized by superficial cells with pyknotic nuclei and absence of stratum granulosum
C. In ortho keratinisation the superficial cells lose their nuclei, but stratum granulosum is present
D. All of the above
Long connective tissue papillae and keratinized epithelia are a feature of these parts of oral mucosa____________?
A. gingiva and alveolar mucosa
B. Hard palate and gingiva
C. Buccal andalveolar mucosa
D. Hard and soft palate
All of the following is lined by stratified squamous epithelium, except ?
A. Lips
B. Tongue
C. Roof of the soft palate
D. Oropharynx
Membrane coating granules may_____?
A. Appear as circular with an amorphous core in keratinized epithelium
B. Originate from golgi system
C. Packed with tonofilaments
D. Helps in adhesion of fully keratinized epithelial cells
Basement membrane______?
A. Contains lamina lucida & Lamina dura
B. Consists luratihyaline granules
C. consists of lamina densa and lamina lucida
D. consists of desmosomes and hemi desmosomes
The high level clear cell present in the oral epithelium is______?
A. Melanocyte
B. Lymphocyte
C. Merkel cell
D. Langerhans cell
Vonebilers glands open into which papilla______?
A. Foliate
B. Filiform
C. Circumvallate
D. Fungiform
Dendritic cell located in the stratified squamous keratinizing epithelium of the oral cavity include________?
A. Keratinocytes
B. Mast cells
C. Melanocytes
D. Myoepithelila cells
After the eruption of crown, reduced enamel is known as______?
A. Primary attachment epithelium
B. Secondary attachment epithelium
C. Primary enamel cuticle
D. Reduced enamel epithelium
The vermilion border requires frequent moistening because________?
A. It contains more No. of sweat glands
B. It contains more do. of sebaceous glands
C. It contains less number of sebaceous glands
D. It contains less number of sweat glands
Stippling’s_______?
A. Due to alternate elevations and depressions in epithelium
B. Functional adaptation to mechanical impact
C. Disappeared in progressing gingivitis due to edema and this change is reversible
D. All of the above
Which of the following is non-keratinocyte ?
A. Langhan’s cell
B. RBC
C. Langerhans cell
D. Grey cell
Partially keratinized papilla is______?
A. Fungiform
B. Filiform
C. Circumvallate
D. Foliate
Keratohyaline granules are more evident in_________?
A. Keratinised
B. Non keratinized
C. Parakeratinised
D. Orthokeratinized
Epithelium of the inner surface of the gingival sulcus________?
A. Has no rete pegs
B. Has prominent rete pegs
C. Is keratinized
D. Is para-keratinized
Elongated rete pegs are seen in______?
A. Alveolar mucosa
B. Floor of the mouth
C. Attached gingiva
D. Buccal mucosa
The connective tissue of the gingiva is known as the____?
A. Lamina dura
B. Dental cuticle
C. Lamina propria
D. Fibroblasts
Color of the normal gingiva is______?
A. Pink
B. Red
C. Coral pink
D. None of the above
Epithelium of oral mucous membrane is_______?
A. Keratinized
B. Non keratinized
C. Ortho, para and non keratinized
D. Only para keratinized
The position of mucogingival line________?
A. Shifts apically with age
B. Shifts coronally with age
C. Constant throughout the life
D. None of the above
Keratohyaline granules are found in______?
A. St. granulosum
B. St. spinosum
C. St. basale
D. Prickle cell layer
In the tongue bitter taste is more perceived at_______?
A. Tip
B. Sides
C. Back
D. Front
The major cells seen in gingiva are_______?
A. Fibro blast
B. Odontoblasts
C. Cementoblasts
D. Merkel cells
Cells of the spinous layer are generally______?
A. Larger than the basal cells
B. Smaller than the basal cells
C. same size as that of basal cells
D. None of the above
Which of the following has immune function in the oral mucous membrane______?
A. Melanocyte
B. Merkel cells
C. Langerhan cell
D. Keratinocyte
The range of level of fluoride secreted by the glands into the mouth is_______?
A. 0.004-0.005 ppm
B. 0.006-0.007 ppm
C. 0.007-0.005 ppm
D. 0.007-0.08 ppm
Protein making up the bulk of keratohyaline granules in stratum granulosum of keratinized epithelium is________?
A. Involucrin
B. Vinculin
C. Filaggrin
D. Nectin
Which papillae are completely keratinized_____?
A. Fungiform
B. Filiform
C. Circumvallate
D. Foliate
Stratum Germinativum of the oral epithelium is the term given to________?
A. Basal cell layer
B. Granular cell layer
C. Spinous cells and granular cells
D. Basal cells and parabasal spinous cells
The oral epithelium is attached to the enamel via_______?
A. Reticular fibers
B. Collagen fibers
C. Hemidesmosomes
D. Desmosomes
Buccal mucosa is________?
A. Keratinized
B. Non-keratinized
C. Parakeratinised
D. Orthokeratinized
Masticatory mucosa is____________?
A. Para keratinised
B. Ortho keratinised
C. Non keratinised
D. Sub keratinised
The anatomic crown is shorter than the clinical crown of a tooth in which of the following instances_______?
A. Impaction
B. Gingivitis
C. Occlusal wear
D. Gingival recession
Epithelial attachment is_________?
A. Attachment of ameloblasts to the tooth
B. Microscopically it resembles basal lamina
C. Derived from secondary attachment epithelium
D. All of the above
The mucous membrane of cheeks and lips________?
A. It attached to buccinator muscle in cheeks
B. It attached to orbicularis oris in lips
C. A & B are correct
D. None of the above
The function of merkel cells is________?
A. Sensory function
B. Secretory function
C. Neuro sensory
D. Nutritive function
Jacobson’s organ is_____?
A. Auxillary olfactory sense organ
B. Ellipsoid/Cigar shaped
C. Undergoes degeneration after 4 months of intrauterine life
D. All of the above
Stratum germinatum is_____?
A. Stratum basale
B. Stratum granulosum
C. Stratum basale and parabasal spinous cells
D. Stratum spinosum
Supporting cells of taste buds are called as______?
A. Sustenticular cells
B. Taste cells
C. Von ebner cells
D. Acini
Bulk of lamina propria of the gingiva is made of collagen type______?
A. I
B. II
C. III
D. IV
Minor salivary glands are present in the submucosa through out the oral mucosa except for the________?
A. Gingiva and anterior part of hard palate
B. Tongue and soft palate
C. Retromolar area and hard palate
D. Lip and posterior third of the hard palate
Difference between the skin and mucosa of cheek is_______?
A. Thin lamina and non keratinized mucosa of cheek
B. Keratinized mucosa of cheek
C. Rete pegs
D. Thick lamina propria on skin of cheek
The thinnest epithelium of oral cavity is found in the_____?
A. Buccal gingiva
B. Lingual gingiva
C. Oral surface of lip
D. Sublingual mucosa (floor of mouth)
The red zones of lips have______?
A. 30% Sebaceous glands
B. 75% sebaceous glands
C. very small number of sebaceous glands, if any
D. Absolutely no sebaceous glands
Masticatory mucosa in the oral cavity covers the________?
A. Floor of the mouth and soft palate
B. Alveolar mucosa and vestibular fornix
C. Lip and cheek
D. Gingiva and hard palate
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MCQs on Oral Histology – Development and Growth of Teeth
Merkel cells are found in which of the following tissue _________?
A. Epidermis
B. Papillary layer of dermis
C. Reticular of dermis
D. Hypodermis
Non keratinized epithelium is found over____?
A. Attached gingiva
B. Free gingiva
C. Interdental papilla
D. Gingival sulcus
Stratum granulosum is not present in_______?
A. Hyper orthokeratosis
B. Hyper parakeratosis
C. Non keratinized epithelium
D. Sulcular epithelium
Biomechanism that unites the epithelium to the tooth surface is_______?
A. Internal basal lamina
B. Junctional epithelium
C. Reduced enamel epithelium
D. Epithelial attachment
Epithelial cells which ultimately keratinize are known as_______?
A. Keratinizing cells
B. Melanocytes
C. Non-Keratinizing cells
D. Clear cells
Lamina densa of the gingival basement membrane is rich in_____________?
A. Type I and III collagen
B. Type III collagen
C. Type IV collagen
D. Type I collagen
In which of the following papillae of the tongue are the taste buds predominantly located ?
A. Circumvallate
B. Filliform
C. Foliate
D. Fungiform
Osteoblasts appear basic gram staining due to_______?
A. Increased ribonucleic acid
B. Acidic ground substance
C. Increased mitochondria
D. Presence of basic ground substance
The maximum rate of eruption, as the tooth cusps reach the surface epithelium is around ________ μm/day?
A. 100
B. 75
C. 50
D. 25
Calcified tissue is absent in______?
A. Enamel
B. Dentin
C. Cementum
D. Pulp
Which of the following factors are primarily contributory to the shedding of deciduous tooth ?
A. Hydrostatic
B. Vascular pressure
C. Oncotic pressure
D. Masticatory pressure
The apical foramen of a fully developed permanent tooth is usually lined by______?
A. Dentin
B. Cementum
C. Epithelial rest cells
D. The Epithelial diaphragm
Specific stain for fat cells is_______?
A. Eosin & haematoxylin
B. Carbol fuschin
C. Sudan III
D. Cresyl violet
Extracted teeth should be preserved in______?
A. Saline
B. Xylene
C. 10% Formalin
D. 10% alcohol
Oral tissue for microscopic examination is prepared by______?
A. Embedded in paraffin and sectioned
B. Embedded in paradion and sectioned
C. Frozen and sectioned
D. Specimens ground into thin sections
E. All of the above
Which enzyme is associated with the mineralization______?
A. Acid phosphatase
B. Alkaline phosphatase
C. Adenosine triphosphate
D. Amino peptidase
Hammock ligament is present______?
A. Between temporal and sphenoid bone
B. Between hamular notch and mandible
C. In apical area of a tooth
D. As a part of deep cervical fascia
The most accepted theory of tooth eruption is_____?
A. Hydrodynamic theory
B. Clone theory
C. Periodontal ligament traction theory
D. Vascular theory
Teeth with out antagonist if erupt is called______?
A. Stable
B. Over erupted
C. Supra erupted
D. Submerged
Movement of tooth to close the intermaxillary gap during eruption is due to_______?
A. Physiological tooth migration
B. Active eruption
C. Passive eruption
D. None of the above
In mineralization which one of the following is known as Epitaxy ?
A. Booster Mechanism
B. Seeding theory
C. Alkaline Phosphatase theory
D. Cartier/s Adenosine Triphosphate theory
The first sign of future deciduous teeth as a thickening of oral ectoderm appears at about________?
A. 25th day of Intra uterine life
B. 34th day of Intra uterine life
C. 56th day of Intra uterine life
D. 20 wks of Intra uterine life
The deciduous teeth can be differentiated from permanent teeth by_______?
A. Enamel prismatic arrangement
B. Dentinal tubule arrangement
C. Primary and secondary dentin
D. Mineral content
Which type of collagen fibers demonstrates Chicken wire configuration ?
A. Type I
B. Type II
C. Type III
D. Type IV
Accentuated incremental lines in dentin are_______?
A. Incremental lines of retzius
B. Incremental lines of von Ebner
C. Contour lines lines of owen
D. None of the above
Gubernacular canal and gubernacular cord are seen in relation to______?
A. Permanent teeth
B. Deciduous teeth
C. Succedaneous teeth
D. None of the above
The cells, which are responsible for removal of bone matrix in bone resorption, are_______?
A. Osteoblast
B. Fibrocytes
C. Polymorphs
D. Osteoclasts
Frozen sections can be used for the demonstration of________?
A. Fat
B. Mucin
C. Cartilage
D. Iron
Dehydration of specimen is carried out by_____?
A. By using 10% formalin
B. By using liquid or solid Co2
C. By using increasing percentages of alcohol
D. By using 5% nitric acid
A suitable fixative for a routine biopsy specimen is________?
A. 10% formalin
B. 40% formalin
C. 20% formalin
D. 10% alcohol
Epithelial attachment is derived from______?
A. Reduced enamel epithelium
B. Dental papilla
C. Inner enamel epithelium
D. Dental sac
Tooth buds of permanent mandibular incisors are situated________?
A. Lingual to primary teeth
B. Inferior to primary teeth
C. Labial to primary teeth
D. A and B
Gubernacular canal guides the eruption of_______?
A. Primary teeth
B. Permanent teeth
C. Both A and B
D. None of the above
Resorption of dental tissue is caused by______?
A. Osteoclasts
B. Osteoblasts
C. Odontoclasts
D. Odontoblasts
Tooth eruption is due to_____?
A. Osteoclastic activity
B. Proliferation of cells at crypt
C. Exforliation of primary tooth
D. Eruptive force
In resorption of roots of the primary teeth, the dental pulp_______?
A. Plays a passive role
B. Becomes a fibrotic non-vital mass
C. Initiates resorption from the inner surface of roots
D. Aids in formation of secondary dentin slowing down resorption
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