571. The perikymata:
A. Is an optical phenomena resulting from changes in direction of enamel rods.
B. Is a highly mineralized outer enamel surface.
C. Is formed of transverse grooves, represents an outer manifestation ofbrown stria of Retzius.
D. Found at the cusp tip.

572. What is the result of cracks before tooth eruption:
A. Enamel lamella type A.
B. Enamel lamella type B.
C. Enamel lamella type C.
D. Enamel tufts.

573. The primary enamel cuticle is formed by the:
A. Outer dental epithelium.
B.Ameloblasts just before tooth eruption.
C. Fusion of oral epithelium and reduced enamel epithelium.
D.Ameloblasts after the enamel has been completed.

574. The surface enamel:
A. Is similar to the subsurface enamel.
B. Is softer than subsurface enamel.
C. Contains less mineral than subsurface enamel.
D. Highly mineralized than subssurface enamel.

575. The prism sheath:
A. Is a continuous sheath.
B. Is more calcified than the enamel rod.
C. Is less calcified than the enamel rod.
D. Is equally calcified when compared to the enamel rod.

576.The predominant inorganic portion of enamel is:
A. Calcium.
B. Carbonate.
C. Phosphate.
D. Fluoride.

577. Incremental lines of Retzius form grooves on the surface of the enamel termed:
A.Perikymata.
B. Neonatal lines.
C. Gnarled enamel.
D. Enamel cuticle

578. Which of the following is poorly calcified enamel?
A. Gnarled enamel.
B. True enamel lamellae.
C.Perikymata and gnarled enamel.
D.Interprismatic substance.

579. The cross striations characteristic of enamel rods represent:
A. Incremental growth pattern.
B. The junctional complex of ameloblasts.
C. Hunter-Schreger bands.
D. The inter rod region.

580. Enamel spindles:
A. Are areas of prismatic enamel.
B. Are present at the occlusal surfaces of enamel.
C. Are the terminal ends of odontoblastic processes.
D. Are located at the cemento-enamel junction.

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