oral histology MCQs – Page 9

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

oral histology Mcqs

161. Tooth develops from_______________?
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A. Ectoderm, mosoderm

B. Mesoderm

C. Ectoderm

D. Ectoderm and endoderm

162. 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

163. Width of PDL is_______________?
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A. 0.25 mm

B. 0.75 mm

C. 0.10 mm

D. 0.50 mm

164. 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

165. Intermediate cementum is___________?
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A. Apical third

B. Coronal third

C. Found at dentinocemental junction

D. Between enamel and cementum

166. 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

167. Odontoblasts are derived from______________?
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A. Lymphocytes

B. Histocytes

C. Macrophages

D. Undifferentiated mesenchymal

168. 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

169. 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

170. 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

171. 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

172. 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

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

B. Pericytes

C. Histocytes

D. Plasma cell

174. 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

175. 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

176. 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

177. The most abundant principle fibre group in periodontal ligament is____________?
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A. Transeptal

B. Horizontal

C. Apical

D. Oblique

178. The hertwigs epithelial root shealth is essential to development of the root because it_______________?
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A. Remians as an essential constituents of the periodontal ligament

B. Given rise to odontoblasts that lay down dentin of the root

C. Moulds the shape of roots and stimulates differentiation of odontoblasts

D. Gives rise to cementoblasts that produce cementum of the root

179. Outer and inner enamel epithelium first seen in____________?
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A. Advanced bell stage

B. Bud stage

C. Bell stage

D. Cap stage

180. During the formation of primary teeth_______________?
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A. Dentin forms faster than enamel

B. Enamel forms faster than dentin

C. Enamel forms more cervically than dentin

D. Processes of their cells remain in content with each other

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