medical MCQs – Page 162

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 Review each marked answer and report any item that may be outdated or unclear.

3221. The key hole, pattern appearance in the cross section is feature of______________?
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A. Intratubular dentin

B. Prismatic enamel

C. Intertubular dentin

D. Aprismatic enamel

3222. Dead tracts in ground section appears as_____________?
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A. Coarse fibril bundles arranged at right angle to the dentinal surface

B. Black in transmitted light and white in reflected light

C. White in transmitted light and dark in reflected light

D. Dentinal tubules

3223. The plexus of Rashkov is present in which of the following zones in pulp ?
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A. Cell rich zone

B. Cell free zone

C. Odontoblastic zone

D. Pulp core

3224. One of the following statement is unique about circumpulpal dentine______________?
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A. Collagen fibers are oriented perpendicular to DEJ

B. Contain phosphophoryn

C. Requires matrix vesicle for mineralization

D. Vonkorff fibers are present

3225. In adult teeth, the type of dentin present underlying dentin-enamel junction is_______________?
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A. Predentin

B. Mantle dentin

C. Interglobular dentin

D. Tertiary dentin

3226. Inter globular dentin results due to_____________?
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A. Fracture of the dentin

B. Failure of coalescence of calcospherities

C. Disturbance in dentinal tubules

D. Artifact in light microscopy

3227. If a childs teeth do not form, this would primarily effect the growth of the_____________?
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A. Mandible

B. Alveolar bone

C. Basal bone

D. Whole face

3228. calcification in enamel starts at____________?
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A. Root

B. CEJ

C. DEJ

D. Enamel matrix

3229. Chronic periapical inflammation is usually associated with____________?
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A. Hyperplasia of cementum

B. Ankylosis

C. Hypertrophy of cementum

D. Resorption of cementum

3230. In considering the process of eruption, the pre-functional eruptive stage of a tooth begins when the_____________?
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A. Dental lamina begins forming

B. Bud stage begins

C. Cap stage begins

D. Bell stage begins

3231. In multirooted teeth, formation of multiple roots is due to presence of_____________?
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A. Epithelial diaphragm

B. Cell rests of Malassez

C. None of the above

D. Toot bud division or bell stage

3232. Compared to the inter tubular dentin, peritubular dentin is characterized by which of the following ?
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A. Greater content of large collagen fibres

B. Lasser content of inorganic salts

C. Greater stainability

D. greater content of inorganic salts
3233. True about direction of enamel rods______________?
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A. They are almost vertical near the incisal edge (or) cusp tip areas

B. In cervical region of permanent teeth, they deviate in apical direction

C. All of the above

D. They originate at right angle to dentin surface

E. In the cervical third of deciduous crowns they are almost horizontal in direction

3234. The class of low molecular weight calcium binding proteins seen predominantly in developing enamel are_____________?
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A. Enamelin

B. Ameloplakin

C. Amelogenin

D. Tuftelin

3235. Bone at forming stage has_________________?
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A. Odontoblasts & megakaryocyte

B. None of the above

C. Megakaryocytes, osteoblasts, osteoclasts

D. Osteoclasts, osteoblasts, osteoid
3236. The dentin adjacent to the dentinoenamel junction is called the______________?
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A. Mantle dentin

B. Secondary dentin

C. Circumpulpal dentin

D. Predentin

3237. Membrana performative is seen in_________________?
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A. Cap stage

B. Advanced bell stage

C. Bell stage

D. Bud stage

3238. Fibres which continue from bone to ligament are_____________?
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A. Sharpeys fibres

B. Tomes fibres

C. Rays fibres

D. All of the above

3239. In a dried skull, holes on the lingual aspects of the deciduous teeth are called_____________?
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A. Herversian canals

B. Canals of Hirchfeld and Zuckerland

C. Volkmann canals

D. Gubernacular canals
3240. The organic lining of the calcified dentinal tubules is known as_______________?
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A. Lamina densa

B. Lamina lucida

C. Lamina limitans

D. Lamina propria