medical MCQs – Page 498

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 Review each marked answer and report any item that may be outdated or unclear.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

9941. calcification in enamel starts at____________?
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A. Enamel matrix

B. CEJ

C. DEJ

D. Root

9942. Compared to the inter tubular dentin, peritubular dentin is characterized by which of the following ?
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A. Greater stainability

B. Lasser content of inorganic salts

C. Greater content of large collagen fibres

D. greater content of inorganic salts

9943. The radicular pulp is continous with tissues of the periapical area via the____________?
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A. Pulp chamber

B. Mental foramen

C. Pulp canal

D. Apical foramen

9944. Accentuated incremental lines in dentin due to disturbances in matrix and mineralization process is_____________?
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A. Incremental lines of retzius

B. None of the above

C. Incremental lines of vonebner

D. Contour lines of owen

9945. Ameloblasts is______________?
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A. A tissue from which tooth erupts

B. A tumour of the jaw

C. A cell from which tooth enamel is formed:

D. Pertaining to dentin

9946. In considering the process of eruption, the pre-functional eruptive stage of a tooth begins when the_____________?
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A. Dental lamina begins forming

B. Cap stage begins

C. Bud stage begins

D. Bell stage begins

9947. Stellate reticulum is seen in______________?
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A. Enamel organ

B. Dental lamina

C. All of the above

D. Hertwigs root sheath

9948. The periodontal ligament is approximately_____________?
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A. 0.75 mm in thickness

B. mm in thickness

C. 0.25 mm in thickness

D. 0.5 mm in thickness

9949. The formation of the dental lamina is initiated by______________?
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A. Forebrain

B. Odontoblasts

C. Neural crest cells

D. Rathkes pouch

9950. Thin leaf like structures that extend from enamel surface in to DEJ are____________?
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A. Enamel spindles

B. Enamel tufts

C. Enamel lamella

D. Perikymata

9951. Any insult to cells in apposition stage result in______________?
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A. Hutchinsons incisor

B. Enamel hypoplasia

C. Osteodentin formation

D. Anodontia

9952. Which of the following statement is correct_________________?
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A. The bodies of rods are near occlusal and incisal surfaces, where as the tails point cervically

B. All of the above

C. The apatite crystals are parallel to bodies and deviate 65 from the tails

D. In cross sections enamel rods appear hexagonal and resembles fish scales

9953. Inter globular dentin results due to_____________?
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A. Artifact in light microscopy

B. Disturbance in dentinal tubules

C. Failure of coalescence of calcospherities

D. Fracture of the dentin

9954. On microscopic examination enamel rods have___________?
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A. None of the above

B. Lanullate appearance in cross-section

C. Key hole appearance in cross section

D. Paddle appearance in cross section

9955. Chronological hypoplasia is_____________?
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A. Hypoplasia of systemic origin

B. Hypoplasia of local origin

C. Hypoplasia of hereditary origin

D. None of the above

9956. Which of the following is true of cellular cementum ?
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A. Seen at the coronal portion of the tooth

B. Forms after the eruption of the tooth

C. Formation is a slow process

D. Forms during root formation

9957. Which of the following is true______________?
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A. Cementum contain type I collagen predominantly

B. Cementodentinal junction is sometimes scallopes in deciduous teeth and smooth in permanent teeth

C. All of the above

D. The uncalcified matrix of cementum is called cementoid

9958. 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

9959. Temporary structures in enamel organ are (before enamel formation) ?
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A. Enamel knot

B. Enamel cord

C. Both A and B

D. Enamel Cuticle

9960. Organic portion can be separated from the mineral by_____________?
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A. Incineration/organic chelation

B. Devitrification

C. Combustion

D. Decalcification

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