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Which of the following does not facilitate the spread of dental caries?


A) Enamel tufts
B) Enamel lamellae
C) Incremental lines
D) Prismless enamel

E) A) and B)
F) B) and C)

Correct Answer

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Enamel is approximately ______ thick at the occlusal or incisal surface.


A) 1 µm
B) 9 µm
C) 2.5 mm
D) 4.5 mm

E) None of the above
F) A) and B)

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Enamel rods extend from the dentinoenamel junction to the enamel outer surface.

A) True
B) False

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A developmental defect at the dentinoenamel junction of enamel that is filled with organic material is called (a/an)


A) enamel rod.
B) enamel tuft.
C) enamel lamellae.
D) enamel spindle.

E) A) and C)
F) C) and D)

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In the Hunter-Schreger phenomenon,adjacent rod groups lie at right angles to each other.

A) True
B) False

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Two ameloblast cells form the enamel rod


A) head.
B) neck.
C) body.
D) tail.

E) All of the above
F) C) and D)

Correct Answer

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The organic component of enamel is called


A) hydroxyapatite.
B) enamelin.
C) gnarled enamel.
D) perikymata.

E) None of the above
F) All of the above

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Ameloblasts travel along parallel paths to produce straight enamel rods.

A) True
B) False

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Enamel rods extend perpendicular to the dentoenamel junction,but curve slightly toward the cusp tip.

A) True
B) False

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Ameloblasts produce _______ as they migrate.


A) cementoid
B) enamel rods
C) epithelial rests
D) dentinal tubules

E) A) and C)
F) A) and B)

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Which part of the enamel rod is most sensitive to demineralization?


A) Tail
B) Core
C) Head
D) Sheath

E) A) and B)
F) None of the above

Correct Answer

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Lamellae are cracks in the surface of enamel and are visible to the naked eye.

A) True
B) False

Correct Answer

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