Question 1

Name the organic component of enamel.

Accepted Answer

The answer of Name the organic component of enamel....

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

Enamel is composed of ______ hydroxyapatite.

Accepted Answer

A)   26%
B)   53%
C)   90%
D)   96%E) A) and C)
F) B) and C)

Question 4

Which of the following best defines incremental lines?

Accepted Answer

A)   Ridges visible on the surface of enamel
B)   Termination of dentinal tubules in enamel
C)   Alternating dark and light bands of enamel rod groups
D)   Lines that result from the rhythmic recurrent deposition of enamelE) C) and D)
F) B) and D)

Question 5

Light and dark enamel rod groups are known as striae of Retzius.

Accepted Answer

A) True 
 B)False

Question 6

Ameloblasts migrate away from the dentinoenamel junction as they produce enamel rods.

Accepted Answer

A) True 
 B)False

Question 7

Two ameloblast cells form the enamel rod _________.

Accepted Answer

The answer of Two ameloblast cells form the enamel rod...

Question 8

Which of the following best defines perikymata?

Accepted Answer

A)   Termination of dentinal tubules in enamel
B)   Alternating dark and light bands of enamel rod groups
C)   Growth lines visible as ridges on the surface of enamel
D)   Lines that result from the rhythmic recurrent deposition of enamelE) A) and D)
F) A) and C) C

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

The neonatal line is best defined as which of the following?

Accepted Answer

A)   An accentuated incremental line
B)   A defect caused by the misdirection of enamel rods
C)   Light and dark enamel rod groups, made visible with light
D)   A series of dark growth rings noticeable in the cross section of enamelE) B) and D)
F) A) and C)

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

Enamel is an impermeable tissue.

Accepted Answer

A) True 
 B)False  False

Question 14

A tuft is a developmental defect in enamel filled with _________ material.

Accepted Answer

The answer of A tuft is a developmental defect in...

Question 15

Hunter-Schreger bands extend through half to two thirds of the enamel.

Accepted Answer

A) True 
 B)False

Question 16

An enamel ______ houses a small extension of a living odontoblast.

Accepted Answer

A)   rod
B)   tuft
C)   spindle
D)   lamellaeE) All of the above
F) C) and D)

Question 17

Enamel is approximately ______thick at the occlusal or incisal surface.

Accepted Answer

A)   1 µm
B)   9 µm
C)   2.5 mm
D)   4.5 mmE) A) and B)
F) C) and D) C

Question 18

Ameloblasts travel along parallel paths to produce straight enamel rods.

Accepted Answer

A) True 
 B)False

Question 19

Prismless enamel is characterized by numerous and pronounced Hunter-Schreger bands.

Accepted Answer

A) True 
 B)False

Question 20

Each enamel rod is formed by a single ameloblast.

Accepted Answer

A) True 
 B)False

Exam 7: Enamel

Name the organic component of enamel.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Enamel is composed of ______ hydroxyapatite.

Correct AnswerverifiedShow Answer

Which of the following best defines incremental lines?

Correct AnswerverifiedShow Answer

Light and dark enamel rod groups are known as striae of Retzius.

Correct AnswerverifiedShow Answer

Ameloblasts migrate away from the dentinoenamel junction as they produce enamel rods.

Correct AnswerverifiedShow Answer

Two ameloblast cells form the enamel rod _________.

Correct AnswerverifiedShow Answer

Which of the following best defines perikymata?

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The neonatal line is best defined as which of the following?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Enamel is an impermeable tissue.

Correct AnswerverifiedFalse

A tuft is a developmental defect in enamel filled with _________ material.

Correct AnswerverifiedShow Answer

Hunter-Schreger bands extend through half to two thirds of the enamel.

Correct AnswerverifiedShow Answer

An enamel ______ houses a small extension of a living odontoblast.

Correct AnswerverifiedShow Answer

Enamel is approximately ______thick at the occlusal or incisal surface.

Correct AnswerverifiedC

Ameloblasts travel along parallel paths to produce straight enamel rods.

Correct AnswerverifiedShow Answer

Prismless enamel is characterized by numerous and pronounced Hunter-Schreger bands.

Correct AnswerverifiedShow Answer

Each enamel rod is formed by a single ameloblast.

Correct AnswerverifiedShow Answer

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C

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False

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C

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