oral histology MCQs – Page 8

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

oral histology Mcqs
141. 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

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

B. Pulp & Periodontal ligament

C. All of the above

D. Pulp only

143. 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

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

B. Initiation

C. Apposition

D. Calcification

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

B. Cementoclasts

C. Osteoclasts

D. Osteoblasts

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

B. 2mm

C. 10mm

D. 0.5mm

147. 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
148. 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

149. 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
150. 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

151. 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

152. 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
153. 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

154. 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

155. 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

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

B. Acellular cementum

C. Cementoid

D. Incremental line

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

B. 86%

C. 96%

D. 66%

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

B. Stratum inter medium

C. Stellate reticulum

D. Cervical loop
159. 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

160. 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