medical MCQs – Page 158

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 Review each marked answer and report any item that may be outdated or unclear.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

3141. Dentinogenesis by odontoblasts first begins at_____________?
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A. Tooth bud stage

B. Pulpal end

C. Cervical area

D. Cusp tip

3142. Remnants of the Hertwigs root sheath are found in____________?
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A. Gingiva

B. Alveolar bone

C. Periodontal ligament

D. Cementum

3143. The dentin receptors are unique because_____________?
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A. Elicit only pain as a response

B. They elicit pain to chemicals

C. They elicit pain to hot and cold

D. They elicit pain to touch and pressure

3144. The marrow found in the mandible is____________?
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A. All fatty marrow

B. All fibrous marrow

C. A combination of fatty and fibrous marrow

D. All red marrow

3145. Periodontal ligament has predominantly_________?
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A. Oxytalan fibres

B. Elastic fibres

C. Type II collagen fibres

D. Type I collagen fibres

3146. Which of the following is not the principle fibre group of the periodontal ligament___________?
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A. Oblique

B. Transseplat

C. Horizontal

D. Alveolar crest

3147. Protein secreted by odontoblast_____________?
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A. Elastin

B. Collagen

C. Chitin

D. Keratin

3148. The cells of the dental pulp which are responsible for the deposition of reparative dentin are_________?
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A. Osteocytes

B. Osteoblasts

C. Ameloblasts

D. Odontoblasts

3149. The zone of dentin most recently formed and uncalcified is known as____________?
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A. Mantle dentin

B. Predentin

C. Secondary dentin

D. Circumpulpal dentin

3150. The formation of the dental lamina is initiated by______________?
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A. Forebrain

B. Rathkes pouch

C. Odontoblasts

D. Neural crest cells

3151. The pain transmission through dentin is______________?
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A. Direct neural stimulation

B. All of the above

C. Transduction theory

D. Fluid or hydrodynamic theory

3152. The fibroblasts associated with capillaries are__________?
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A. Pericytes

B. Plasma cell

C. Histocytes

D. Lymphocytes

3153. The intimal B cells of synovical memrbane of temporomandibular joint are_______________?
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A. Macrophage like

B. Lmphocyte like

C. Plasma cell like

D. Fibroblast like

3154. All of the following are true about functions of dental pulp except______________?
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A. Nerve supply to dentin

B. Formation of dentin

C. Nerve supply to enamel through fibres

D. Sends impulses to CNS

3155. The duct(s) of gland(s) opening into the floor of the mouth is (are)_______________?
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A. Von Ebner

B. Submandibular and sublingual

C. submandibular and parotid

D. Sublingual and parotid

3156. The rest of malassez in the periodontal ligament are derived from_____________?
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A. Lamina propria

B. Odontogenic epithelium

C. Dental pulp

D. Vestibular lamina

3157. The hertwigs epithelial root shealth is essential to development of the root because it_______________?
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A. Given rise to odontoblasts that lay down dentin of the root

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

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

D. Remians as an essential constituents of the periodontal ligament

3158. Width of PDL is_______________?
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A. 0.50 mm

B. 0.75 mm

C. 0.25 mm

D. 0.10 mm

3159. The odontoblasts killed during cavity preparation are derived from_____________?
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A. Unaffected odontoblasts from the pulp

B. Osteoblasts

C. Histocytes

D. Undifferentiated cells

3160. Which of the following structures is not found in a living pulp ?
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A. Non-myelinated nerve fibres

B. Collagen fibres

C. Haversian fibres

D. Reticulum

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