651. Human primary dentin contains:
A. Mantle &circumpulpal dentin.
B. Tomes’ process.
C. Cell bodies.
D.Atubular dentin.

652. Which of the following is considered as age changes?
A. Transparent dentin.
B. Cellular cementum.
C. Primary dentin.
D.Enamel spindle.

653. Reparative dentin:
A. Contain regular and numerous dentinal tubules.
B. Obliterates the apical foramen.
C. Forms on localized regions of the pulpal surface of the dentin.
D. Formation is induced by the cells of the inner dental epithelium.

654. Matrix vesicles are present during:
A. The initial mineralization of dentin.
B. The initial mineralization of enamel.
C. The initial mineralization of cementicles.
D. The initial mineralization of denticles.

655. Which of the following is least prominent in odontoblasts and secretory ameloblasts?
A. Rough endoplasmic reticulum.
B. Mitochondria.
C. Golgi apparatus.
D. Lysosomes.

656. Collagenous fibers are not found in:
A. Mantle dentin.
B. Reparative dentin.
C. The outer prismless layer.
D. The dental sac.

657. Obliteration of the dentinal tubules by mineral deposits:
A. Occurs only when the dentin becomes exposed to the oral fluids.
B. Produces dead tracts.
C. First occurs in predentin.
D.Is seen in sclerotic and transparent dentine.

658. Tome’s granular layer is:
A. An extension of odontoblast processes into enamel.
B.A region lacking dentinal tubules.
C. Following the incremental lines.
D.Derived from the epithelial rests of Malassez.

659.Amelogenesis and dentinogenesis are similar in which respect?
A. Both processes involve the secretion of collagenous fibersimpregnation with hydroxy-apatite crystals.
B.Both processes involve maturation with hydroxyappatite crystals.
C.Both processes start simultaneously at the early crown stage.
D.Both processes continue throughout the life of the tooth.

660. Which of the following has the highest mineral content?
A.Predentin.
B. Peritubular dentin.
C.Intertubular dentin.
D.Cementum.

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