medical MCQs – Page 501

Practise multiple-choice questions from medical for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

medical Mcqs

1. oral anatomy 2. microbiology 3. oral pathology and medicine 4. physiology 5. biochemistry 6. general anatomy 7. dental materials 8. pharmacology 9. pathology 10. oral histology

10001. Which of the following anomalies occur during the initiation and proliferation of tooth development ?
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A. Oligodontia

B. Enamel hypoplasia

C. Amelogenisis imperfecta

D. Dentinogenesis imperfecta

10002. In a dried skull, holes on the lingual aspects of the deciduous teeth are called_____________?
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A. Canals of Hirchfeld and Zuckerland

B. Herversian canals

C. Volkmann canals

D. Gubernacular canals

10003. Dental lamina is active up to_______________?
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A. 1 year

B. 3 years

C. 4 years

D. 2 years

10004. Specific gravity of enamel is_____________?
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A. 4.8

B. 2.8

C. 2.3

D. 3.8

10005. The odontoblasts killed during cavity preparation are derived from_____________?
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A. Histocytes

B. Undifferentiated cells

C. Osteoblasts

D. Unaffected odontoblasts from the pulp

10006. Dental papilla gives rise to_____________?
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A. Pulp & Dentin

B. Pulp & Periodontal ligament

C. All of the above

D. Pulp only

10007. The thickness of prismless enamel in diciduous teeth is______________?
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A. 100 ? m

B. 50 ? m

C. 25 ? m

D. 75 ? m

10008. A supernumerary tooth results from a deviation during_____________?
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A. Differentiation

B. Initiation

C. Apposition

D. Calcification

10009. The calcified mass found in the PDL are_____________?
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A. Cementicles

B. Cementoclasts

C. Osteoclasts

D. Osteoblasts

10010. The average width of enamel rods is______________?
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A. 5mm

B. 2mm

C. 10mm

D. 0.5mm

10011. Calcium content of lamina dura is______________?
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A. Same as in other parts of alveolar bone

B. Less than the cementum

C. Less than the other parts of alveolar bone

D. More than the other parts of alveolar bone

10012. Among the following the structure that is most calcified is_______________?
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A. Enamel spindle

B. Enamel tuft

C. Enamel rod

D. Enamel lamella

10013. Pericytes are found___________?
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A. In thymus

B. In gallbladder

C. Along with heparin on surface of mast cells

D. Around capillaries of pulp

10014. Regressive changes in pulp include____________?
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A. All of the above

B. Increased fibrotic component

C. Calcification in blood vessels near apical foramen

D. Decreased cellular component

10015. Transmission of stimulus across dentin is______________?
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A. Stimulus induced fluid flow

B. There is no transmission of stimulus across dentin

C. Direct activation of nerve endings

D. Correlated with the innervation density of the dentin

10016. Narrowing of periodontal ligament in labially placed mandibular canine with age is due to_____________?
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A. Down growths of gingival epithelium

B. Reversal of function of horizontal and oblique fibres

C. Gingival cysts formed from cell rests

D. Due to deposition of cementum and bone

10017. Inorganic content of cementum is_____________?
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A. More than that of enamel

B. More than bone

C. Less than bone

D. Equal to that of bone

10018. One of the following statement is unique about circumpulpal dentine______________?
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A. Contain phosphophoryn

B. Requires matrix vesicle for mineralization

C. Collagen fibers are oriented perpendicular to DEJ

D. Vonkorff fibers are present

10019. Which of the following structures is not of ectodermal origin_______________?
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A. Enamel spindles

B. Hunter schreger bands

C. Enamel tufts

D. Enamel lamellae

10020. Which of the following is least mineralized ?
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A. Cellular cementum

B. Acellular cementum

C. Cementoid

D. Incremental line

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