551. Enamel tufts:
A. Contain cellular processes.
B. Can pass to dentin.
C. Are seen in decalcified sections.
D. Are grass like structure.

552. During the maturation stage of enamel formation, which of the following does not occur in the ameloblastic layer?
A. Water absorption.
B. Protein absorption.
C. Change in cellular organelles.
D. Secretion of enamel matrix.

553. When prismless enamel is formed, the secretory ameloblast does not contain:
A. Rough endoplasmic reticulum.
B. Tome’s process.
C. Nucleus.
D.Secretory granules.

554.Which of the following is true:
A. Enamel is the weakly mineralized tissue.
B. Enamel is the highly mineralized tissue.
C. Enamel is the highly permeable tissue.
D.Enamel is a non brittle tissue.

555. Neonatal lines are present in:
A. All permanent teeth.
B. Permanent canines.
C. All deciduous & first permanent molar.
D.Premolars.

556. Organic components of enamel are primarily removed from enamel by:
A. Secretory ameloblasts.
B.Maturativeameloblasts.
C. Transitional ameloblasts.
D.Enamel spindle.

557. The main difference between the rod and the interrod region is:
A. Crystal size.
B. Crystal orientation.
C. Crystal composition.
D. In the nature of the organic component.

558. The striae of Retzius:
A.Are parallel to the enamel rods.
B. Are parallel to the surface of the enamel in the cervical region.
C.Are not seen in the cuspal one third of the enamel.
D.Would be seen as concentric rings in a horizontal section of the crown.

559.Enamel is composed of:
A. Rod, interrod& rod sheath.
B. Only enamel prisms.
C. Needle shaped crystals.
D. Prism sheath.

560.The extensions from secretory ameloblast cells that give structure
to enamel rods are called:
A. Enamel tuft.
B. Tomes processes.
C. Enamel spindles.
D. Enamel lamellae.

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