medical MCQs – Page 159

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 Review each marked answer and report any item that may be outdated or unclear.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

3161. The shallow furrows on the enamel surface, where stria of Retzius end are known as _______________ ?
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A. perikymata

B. Enamel lamellae

C. Pellicle

D. Cracks

3162. Dentinal tubules are______________?
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A. Concave

B. Straight

C. S0shaped

D. None of the above

3163. Second arch derivatives are all except_________________?
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A. Styloid process

B. Malleus and incus

C. Stapes

D. Superior part of hyoid bone

3164. Cellular cementum is____________?
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A. First formed cementum

B. Less irregular

C. More calcified than acellular type

D. Less calcified than acellular type

3165. Pulp responds to all stimuli by pain because it has only_______________?
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A. Free nerve endings

B. Ruffini corpuscle

C. Krause end bulbs

D. Pacinian corpuscle

3166. Bundle bone is part of____________?
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A. Cementum

B. Periodontal ligament

C. Longbones

D. Alveolar bone

3167. Enamel is laid down______________?
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A. Mainly by ameloblasts

B. Mainly by odontoblasts

C. Only on odontoblasts

D. Only by ameloblasts

3168. Aging process affects pulp tissue by_____________?
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A. Decreasing the size and shape of pulp tissue and cellular component

B. Increases vascularity of the pulp

C. Decrease the calcific component of the pulp

D. Increase cellular component at the expenses of fibre component

3169. The total volumes of all permanent pulp organ______________?
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A. 3.8 cc

B. 0.38 cc

C. 0.58 cc

D. 0.02 cc

3170. S shape of dentinal tubules is due to______________?
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A. Peritubular dentin

B. Due to excess amount of organic component

C. Incremental deposition

D. Crowding of odontoblasts

3171. Disturbance during the morphodifferentition stage of tooth development will result in______________?
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A. Change in number of teeth

B. Change in form and shape of the teeth

C. Ameloblastoma

D. Hypoplasia

3172. Enamel pearls are found in_____________?
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A. None of the above

B. Occlusal surface of premolars

C. Furcation areas of permanent molars

D. On the incisal edges of incisors

3173. Periodontal fibres joining cemental surface of one tooth, to cemental surface of adjacent tooth are called____________?
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A. Gingivodental

B. Transseptal fibres

C. Cemental fibres

D. Horizontal fibres

3174. The bud, cap and bell stage of the developing tooth are based, on growth of the______________?
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A. Dental sac

B. Stellate reticulum

C. Enamel organ

D. Dental papilla

3175. Basal bone is____________?
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A. That part of the bone embracing apices of root of teeth

B. Lower border of the mandible

C. That part of the bone containing teeth

D. Ramus of the mandible

3176. At the cemento enamel junction, which of the following occurs_____________?
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A. Cementum does not meet enamel

B. Cementum meets enamel

C. All of the above

D. Cementum overlaps enamel

3177. The cells that form secondary dentin are_______________?
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A. Fibroblasts

B. Cementoblasts

C. Odontoblasts

D. Osteoblasts

3178. The average width of enamel rods is______________?
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A. 2mm

B. 5mm

C. 0.5mm

D. 10mm

3179. The radicular pulp is continous with tissues of the periapical area via the____________?
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A. Pulp chamber

B. Mental foramen

C. Apical foramen

D. Pulp canal

3180. Intermediate plexus is absent in which of the following principle fibres_____________?
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A. Gingival

B. Horizontal

C. Transseptal

D. Oblique

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