medical MCQs – Page 504

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 Review each marked answer and report any item that may be outdated or unclear.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

10061. Dentino enamel junction is_________________?
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A. Straight

B. Scalloped and the convexities are directed towards enamel

C. Scalloped and the convexities are directed towards dentin

D. Non-scalloped

10062. Korffs fibres are seen in______________?
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A. Mantle dentin

B. Reactionary dentin

C. Secondary dentin

D. Indeed dermal tubules

10063. All factors govering dentine permeability EXCEPT_______________?
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A. Smear layer

B. Length of dentinal tubules

C. Fluid convection

D. Diffusion coefficient

10064. The vascular supply of the periodontal ligament is______________?
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A. A net like plexus that runs closer to the bone than to the cementum

B. Greatest in the middle-third of a multirooted tooth

C. Greatest in the middle-third of a single rotted tooth

D. A net like plexus that runs closer to the cementum than to the bone

10065. The development of pulp begins__________?
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A. 6th week of IU

B. 18th week of IU

C. 8th week of IU

D. 10th week of IU

10066. Dentinal tubules are______________?
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A. None of the above

B. Straight

C. Concave

D. S0shaped

10067. Which of the following is correct?
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A. Sclerotic transparent dentin appears transparent or light in transmitted light and dark in reflected light

B. All of the above

C. Reparative dentin is characterized by having fewer and more twisted tubules than normal dentin and may include odontoblasts

D. Dead tracts appear black in transmitted and white in reflected ligth

10068. Following is not an external manifestation of enamel________________?
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A. Enamel tufts

B. Incremental lines of enamel

C. Enamel lamella

D. Enamel cuticle

10069. The striking difference between enamel and other mineralized tissues is______________?
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A. Most of organic component is lost during mineralization

B. Presence of incremental lines

C. Enamel has high reparative capacity

D. Presence of high percentage of organic matrix

10070. Cementicles are found in the_____________?
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A. Cementum

B. Alveolar bone

C. Gingiva

D. Periodontal ligament

10071. Formation of dentin by odontoblasts begins in_______________?
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A. Organizing stage

B. Desmolytic stage

C. Morphogenic stage

D. Formative stage

10072. The average diameter of coronal dentinal tubules near the pulp is____________?
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A. 7 microns

B. 2-3 microns

C. 0.2-0.3 microns

D. 0.2-0.5 microns

10073. Which of the areas of the tooth is most sensitive during cavity preparation ?
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A. Enamel (anterior teeth)

B. Dentin

C. Dentinoenamel junction

D. Enamel (Posterior teeth)

10074. Pulp tissue contains all except____________?
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A. Capillary

B. Ameloblasts

C. Osteoblasts

D. Fibroblasts

10075. At the cemento enamel junction, which of the following occurs_____________?
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A. Cementum does not meet enamel

B. Cementum overlaps enamel

C. All of the above

D. Cementum meets enamel

10076. First appearance of tooth formation occurs in____________?
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A. 9th week IU

B. 4th week IU

C. 2nd week IU

D. 6th week IU

10077. The zone of dentin most recently formed and uncalcified is known as____________?
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A. Circumpulpal dentin

B. Secondary dentin

C. Predentin

D. Mantle dentin

10078. The type of bone present in the labial area of anterior teeth is_______________?
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A. Exophytic

B. Osteophytics

C. Cancellous

D. Cortical

10079. S shape of dentinal tubules is due to______________?
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A. Incremental deposition

B. Peritubular dentin

C. Crowding of odontoblasts

D. Due to excess amount of organic component

10080. Which of the following is correct?
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A. All of the above

B. Each ameloblast contributes to 4 different rods

C. Each rod is formed by 4 ameloblasts

D. Head of the rod is formed by one ameloblasts, and tail is formed by three other ameloblasts

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