Question 1

Each enamel rod is formed by a single ameloblast.

Accepted Answer

A) True 
 B)False

Question 2

Which type of enamel contains many tiny spaces stained with pigment?

Accepted Answer

A)   Gnarled
B)   Prenatal
C)   Postnatal
D)   PrismlessE) B) and D)
F) C) and D)

Question 3

Which of the following best defines the neonatal line?

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 enamel.E) None of the above
F) A) and C)

Question 4

Enamel lamellae are not tubular defects,but leaf-like tracts.

Accepted Answer

A) True 
 B)False  True

Question 5

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) B) and D)
F) None of the above D

Question 6

Enamel is composed of ______ hydroxyapatite.

Accepted Answer

A)   26%
B)   53%
C)   90%
D)   96%E) B) and D)
F) None of the above

Question 7

Ameloblasts deposit 4 µm of enamel rods daily.

Accepted Answer

A) True 
 B)False

Question 8

Etching the surface of enamel stimulates remineralization.

Accepted Answer

A) True 
 B)False

Question 9

Which statement is true?

Accepted Answer

A)   Tubular defects are associated with enamel lamellae.
B)   Lamellae provide increased resistance to dental caries.
C)   Breathing cold air is a risk factor in developing enamel lamellae.
D)   Enamel lamellae are microscopic cracks in the surface of enamel.E) A) and B)
F) All of the above

Question 10

Incremental lines result from the rhythmic,recurrent deposition of enamel.

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A)   rod
B)   tuft
C)   spindle
D)   lamellaeE) C) and D)
F) None of the above

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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 enamel.E) C) and D)
F) B) and D) C

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

Enamel varies in density and hardness.

Accepted Answer

A) True 
 B)False

Question 17

Enamel is an impermeable tissue.

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

The surface of the enamel rod is called the rod

Accepted Answer

A)   margin.
B)   periphery.
C)   sheath.
D)   core.E) A) and D)
F) C) and D)

Question 20

Perikymata are found in which location?

Accepted Answer

A)   Cusp tip
B)   Cervical third of the root
C)   Middle third of the crown's lingual aspect
D)   Cervical third of the crown's facial aspectE) A) and D)
F) A) and C)

Exam 7: Enamel

Each enamel rod is formed by a single ameloblast.

Correct AnswerverifiedShow Answer

Which type of enamel contains many tiny spaces stained with pigment?

Correct AnswerverifiedShow Answer

Which of the following best defines the neonatal line?

Correct AnswerverifiedShow Answer

Enamel lamellae are not tubular defects,but leaf-like tracts.

Correct AnswerverifiedTrue

Which of the following best defines incremental lines?

Correct AnswerverifiedD

Enamel is composed of ______ hydroxyapatite.

Correct AnswerverifiedShow Answer

Ameloblasts deposit 4 µm of enamel rods daily.

Correct AnswerverifiedShow Answer

Etching the surface of enamel stimulates remineralization.

Correct AnswerverifiedShow Answer

Which statement is true?

Correct AnswerverifiedShow Answer

Incremental lines result from the rhythmic,recurrent deposition of enamel.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following best defines perikymata?

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

Enamel varies in density and hardness.

Correct AnswerverifiedShow Answer

Enamel is an impermeable tissue.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The surface of the enamel rod is called the rod

Correct AnswerverifiedShow Answer

Perikymata are found in which location?

Correct AnswerverifiedShow Answer

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True

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D

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C

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