Question 1

Which of the following are noted as small,dark brushes with their bases near the dentinoenamel junction within mature enamel?

Accepted Answer

A)   Enamel tufts
B)   Enamel lamellae
C)   Enamel spindles
D)   Enamel rodsE) C) and D)
F) B) and C)

Question 2

Which of the following can occur to mature enamel with a case of bulimia?

Accepted Answer

A)   Abrasion
B)   Erosion
C)   Abfraction
D)   AttritionE) B) and C)
F) None of the above B

Question 3

Which of the following is not associated with the incremental nature of enamel?

Accepted Answer

A)   Tomes granular layer
B)   Lines of Retzius
C)   Perikymata
D)   Imbrication linesE) A) and B)
F) A) and C)

Question 4

Enamel matrix is a(n)  _____ product,because ameloblasts are derived from the inner enamel epithelium of the enamel organ.

Accepted Answer

A)   ectodermal
B)   endodermal
C)   mesodermal
D)   neural crest cellE) B) and C)
F) A) and B)

Question 5

What is the approximate amount of inorganic material in mature enamel?

Accepted Answer

A)   50%
B)   65%
C)   70%
D)   96%E) None of the above
F) A) and D) D

Question 6

Enamel _____form the crystalline structural unit of enamel.

Accepted Answer

A)   tubules
B)   cuticles
C)   granules
D)   rodsE) All of the above
F) None of the above

Question 7

The ______ refer(s)  to incremental lines that stain brown in preparations of mature enamel.

Accepted Answer

A)   Tomes granular layer
B)   Hunter-Schreger bands
C)   lines of Retzius
D)   imbrication lines of von EbnerE) B) and C)
F) None of the above

Question 8

Which of the following is a pronounced incremental line in enamel?

Accepted Answer

A)   Neonatal line
B)   Tomes granular layer
C)   Imbrication line of von Ebner
D)   Enamel lamellaE) A) and C)
F) All of the above

Question 9

Which of the following is not a usual way for erosion of enamel to occur?

Accepted Answer

A)   Bulimia
B)   Gastric reflux
C)   Drinking carbonated drinks
D)   Acid production by cariogenic bacteriaE) None of the above
F) C) and D)

Question 10

Enamel rods interdigitate at each cusp tip to form a complex known as:

Accepted Answer

A)   interrod enamel.
B)   gnarled enamel.
C)   perikymata.
D)   imbrication lines.E) A) and B)
F) B) and D)

Question 11

Enamel matrix is produced by the _____ cells.

Accepted Answer

A)   ameloblasts
B)   odontoblasts
C)   odontoclasts
D)   cementoblastsE) A) and B)
F) A) and C)

Question 12

The crystals in the enamel rod groups bend sinusoidally to the right or left at a slightly different angle than do adjacent groups,which is shown in the:

Accepted Answer

A)   Tomes granular layer.
B)   Hunter-Schreger bands.
C)   lines of Retzius.
D)   imbrication lines of von Ebner.E) B) and C)
F) B) and D)

Question 13

How does mature enamel appear on a radiograph as compared to dentin or pulp of the erupted tooth?

Accepted Answer

A)   Radiolucent
B)   Radiopaque
C)   Both dense and radiolucent
D)   Both dense and radiopaqueE) All of the above
F) A) and B)

Question 14

Which of the following occurs with the deposition of minerals into mature enamel?

Accepted Answer

A)   Demineralization
B)   Erosion
C)   Remineralization
D)   AbfractionE) A) and B)
F) A) and C) C

Question 15

After the ameloblasts are finished with both enamel appositional growth and maturation,they become part of the:

Accepted Answer

A)   odontoclast population.
B)   Hertwig epithelial root sheath.
C)   reduced enamel epithelium.
D)   cervical loop.E) All of the above
F) B) and D)

Question 16

Which of the following represent short dentinal tubules located near the dentinoenamel junction within mature enamel?

Accepted Answer

A)   Enamel tufts
B)   Enamel lamellae
C)   Enamel spindles
D)   Enamel rodsE) A) and D)
F) A) and B)

Question 17

Which of the following are partially mineralized vertical sheets of enamel matrix that extend from the dentinoenamel junction near the tooth's cervix to the outer occlusal surface?

Accepted Answer

A)   Enamel tufts
B)   Enamel lamellae
C)   Enamel spindles
D)   Enamel rodsE) None of the above
F) A) and B)

Question 18

In what part of the erupted tooth is mature enamel noted?

Accepted Answer

A)   Anatomical crown
B)   Anatomical root
C)   Both anatomical crown and clinical crown
D)   Both anatomical root and clinical rootE) B) and C)
F) A) and D)

Question 19

Enamel can be lost by _____ ,which is caused by increasing the tensile and compressive forces during tooth flexure,which possibly occurs during parafunctional habits with their occlusal loading.

Accepted Answer

A)   abrasion
B)   erosion
C)   abfraction
D)   attritionE) C) and D)
F) All of the above

Question 20

Which of the following cell types are not renewable during the lifetime of the tooth?

Accepted Answer

A)   Ameloblasts
B)   Odontoblasts
C)   Odontoclasts
D)   CementoblastsE) C) and D)
F) A) and D)

Exam 12: Enamel

Which of the following are noted as small,dark brushes with their bases near the dentinoenamel junction within mature enamel?

Correct AnswerverifiedShow Answer

Which of the following can occur to mature enamel with a case of bulimia?

Correct AnswerverifiedB

Which of the following is not associated with the incremental nature of enamel?

Correct AnswerverifiedShow Answer

Enamel matrix is a(n) _____ product,because ameloblasts are derived from the inner enamel epithelium of the enamel organ.

Correct AnswerverifiedShow Answer

What is the approximate amount of inorganic material in mature enamel?

Correct AnswerverifiedD

Enamel _____form the crystalline structural unit of enamel.

Correct AnswerverifiedShow Answer

The ______ refer(s) to incremental lines that stain brown in preparations of mature enamel.

Correct AnswerverifiedShow Answer

Which of the following is a pronounced incremental line in enamel?

Correct AnswerverifiedShow Answer

Which of the following is not a usual way for erosion of enamel to occur?

Correct AnswerverifiedShow Answer

Enamel rods interdigitate at each cusp tip to form a complex known as:

Correct AnswerverifiedShow Answer

Enamel matrix is produced by the _____ cells.

Correct AnswerverifiedShow Answer

The crystals in the enamel rod groups bend sinusoidally to the right or left at a slightly different angle than do adjacent groups,which is shown in the:

Correct AnswerverifiedShow Answer

How does mature enamel appear on a radiograph as compared to dentin or pulp of the erupted tooth?

Correct AnswerverifiedShow Answer

Which of the following occurs with the deposition of minerals into mature enamel?

Correct AnswerverifiedC

After the ameloblasts are finished with both enamel appositional growth and maturation,they become part of the:

Correct AnswerverifiedShow Answer

Which of the following represent short dentinal tubules located near the dentinoenamel junction within mature enamel?

Correct AnswerverifiedShow Answer

Which of the following are partially mineralized vertical sheets of enamel matrix that extend from the dentinoenamel junction near the tooth's cervix to the outer occlusal surface?

Correct AnswerverifiedShow Answer

In what part of the erupted tooth is mature enamel noted?

Correct AnswerverifiedShow Answer

Enamel can be lost by _____ ,which is caused by increasing the tensile and compressive forces during tooth flexure,which possibly occurs during parafunctional habits with their occlusal loading.

Correct AnswerverifiedShow Answer

Which of the following cell types are not renewable during the lifetime of the tooth?

Correct AnswerverifiedShow Answer

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B

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D

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C

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