medical MCQs – Page 502

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 Review each marked answer and report any item that may be outdated or unclear.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

10021. The percentage of inorganic matter in fully developed enamel is about____________?
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A. 76%

B. 86%

C. 96%

D. 66%

10022. Hertwigs root sheath is formed from______________?
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A. Outer enamel epithelium

B. Stratum inter medium

C. Stellate reticulum

D. Cervical loop

10023. The class of low molecular weight calcium binding proteins seen predominantly in developing enamel are_____________?
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A. Ameloplakin

B. Amelogenin

C. Enamelin

D. Tuftelin

10024. The cells of the enamel organ which differentiate into future ameloblasts are_____________?
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A. Cells of inner enamel epithelium

B. Cells of stratum intermedium

C. Cells of stellate reticulum

D. Cells of outer enamel epithelium

10025. Tooth develops from_______________?
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A. Ectoderm, mosoderm

B. Mesoderm

C. Ectoderm

D. Ectoderm and endoderm

10026. The type of dentin that is formed prior to root completion______________?
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A. Circum pulpal dentin

B. Peritubular dentin

C. Secondary dentin

D. Inter tubular dentin

10027. Width of PDL is_______________?
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A. 0.25 mm

B. 0.75 mm

C. 0.10 mm

D. 0.50 mm

10028. The enamel has no capacity of self repair because______________?
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A. It has no direct connection with the active cells of the dental pulp

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 only a small percent of organic content

10029. Intermediate cementum is___________?
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A. Apical third

B. Coronal third

C. Found at dentinocemental junction

D. Between enamel and cementum

10030. Neonatal lines are found in all of the following except____________?
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A. Dentin of permanent mandibular incisors

B. Enamel of permanent canines

C. Enamel and dentin of permanent first molars

D. Enamel of primary incisors

10031. Odontoblasts are derived from______________?
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A. Lymphocytes

B. Histocytes

C. Macrophages

D. Undifferentiated mesenchymal

10032. Accessory canals result from____________?
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A. Adherent epithelial rests

B. Break in Hertwigs root sheath

C. Defects in cementogenesis

D. Dividing epithelial bridges

10033. The formation of which of the following does not represent normal physiologiacl process of dentin formation_______________?
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A. All of the above

B. Tetiary dentin and sclerotic dentin

C. Primary and secondary dentin

D. Secondary dentin and circumpulpal dentin

10034. Unmyelinated nerve fibres of pulp are____________?
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A. Respond to hot and cold

B. Sensory in nature

C. carry pain sensation

D. Associated with blood vessels and are sympathetic in nature

10035. Nutrition for ameloblasts after 1st layer of enamel is laid is______________?
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A. Odontoblastic process

B. Dental sac

C. Ree

D. Dental Papilla

10036. The main function of horizontal fibres of P.D ligament is____________?
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A. Prevent rotation

B. Maintains the mesiodistal width

C. Prevent extrusion

D. All of the above

10037. The fibroblasts associated with capillaries are__________?
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A. Lymphocytes

B. Pericytes

C. Histocytes

D. Plasma cell

10038. Width of the periodontal ligament is least at______________?
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A. Fulcrum of rotation

B. Apical third

C. Cervical third

D. It has uniform width

10039. Enamel pearls are found in_____________?
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A. Occlusal surface of premolars

B. On the incisal edges of incisors

C. None of the above

D. Furcation areas of permanent molars

10040. Size of pulp chamber____________?
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A. Increases with age

B. Increased in some cases and decreases in some cases

C. Decreases with age

D. None of the above

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