oral histology MCQs – Page 14

Practise focused oral histology questions with marked answers for exam preparation and subject revision.

oral histology Mcqs
261. Shape of crown and the size of the roots is determined by______________?
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A. Cementum

B. Enamel

C. Dentin

D. Pulp

262. Enamel is laid down______________?
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A. Only on odontoblasts

B. Mainly by odontoblasts

C. Mainly by ameloblasts

D. Only by ameloblasts
263. Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are______________?
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A. Bent

B. Shallow

C. Curved

D. Straight

264. The cell free zone in pulp lies____________?
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A. In pulp horn

B. Above odontoblast

C. In radicular pulp

D. Below odontoblast
265. The type of tertiary dentin which contains cellular inclusions is found in_____________?
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A. Osteodentin

B. Mantle dentin

C. Sclerotic dentin

D. Predentin

266. The cap stage in tooth development is characterized by_____________?
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A. Formation of hammock ligament

B. Increased mitotic activity

C. reversal of functional polarity

D. morphodifferentiation

267. The dentin adjacent to the dentinoenamel junction is called the______________?
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A. Circumpulpal dentin

B. Mantle dentin

C. Predentin

D. Secondary dentin

268. All of the following are true about functions of dental pulp except______________?
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A. Formation of dentin

B. Nerve supply to enamel through fibres

C. Sends impulses to CNS

D. Nerve supply to dentin

269. Secondary cementum is generally confined to_____________?
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A. Cervical third of the root

B. No secondary cementum forms

C. Apical third of the root

D. Middle third of the root

270. Protein secreted by odontoblast_____________?
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A. Collagen

B. Elastin

C. Chitin

D. Keratin

271. Length of enamel rods is_____________?
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A. Greater than the thickness of enamel

B. None of the above

C. Equal to the thickness of enimal

D. Less than the thickness of enamel

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

B. Interglobular dentin

C. Mantle dentin

D. Predentin

273. Interdependency of osteoblasts and osteoclasts in bone remodeling is called as_____________?
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A. Reversal lines

B. Canaliculi

C. Lacunae

D. Coupling
274. The successors of deciduous teeth develops form_______________?
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A. Stellate reticulum

B. Successional lamina

C. Neutral ectodermal cells

D. Dental lamina

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

B. White in transmitted light and dark in reflected light

C. Black in transmitted light and white in reflected light

D. Dentinal tubules

276. Neonatal line is also referred to as______________?
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A. Retzius line

B. Incremental lines

C. Line of enamel tufts

D. Line of cross striations

277. Enamel can act in a sense like a_______________?
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A. Permeable membrane

B. Impermeable membrane

C. Infrapermeable membrane

D. Semipermeable membrane
278. All are true about the striae of retzius except___________?
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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

279. Cementum that forms in conjunction with root end formation and eruption_____________?
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A. Cellular cementum

B. Acellular cementum

C. Both of the above

D. None of the above

280. Dentinogenesis by odontoblasts first begins at_____________?
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A. Pulpal end

B. Cusp tip

C. Cervical area

D. Tooth bud stage