Question 1

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

Accepted Answer

A) True 
 B)False  True

Question 2

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. 
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. C

Question 3

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 enamel 
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 enamel D

Question 4

Enamel is composed of ______ hydroxyapatite.

Accepted Answer

A)  26% 
B)  53% 
C)  90% 
D)  96% 
A)  26% 
B)  53% 
C)  90% 
D)  96%

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

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. 
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.

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Each enamel rod is formed by a single ameloblast.

Accepted Answer

A) True 
 B)False

Question 11

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. 
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.

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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 aspect 
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 aspect

Question 14

Enamel varies in density and hardness.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A)  Gnarled 
B)  Prenatal 
C)  Postnatal 
D)  Prismless 
A)  Gnarled 
B)  Prenatal 
C)  Postnatal 
D)  Prismless

Question 16

Enamel is an impermeable tissue.

Accepted Answer

A) True 
 B)False

Question 17

Ameloblasts deposit 4 µm of enamel rods daily.

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

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

Question 19

Etching the surface of enamel stimulates remineralization.

Accepted Answer

A) True 
 B)False

Question 20

The surface of the enamel rod is called the rod

Accepted Answer

A)  margin. 
B)  periphery. 
C)  sheath. 
D)  core. 
A)  margin. 
B)  periphery. 
C)  sheath. 
D)  core.

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

Which of the following best defines perikymata?

Which of the following best defines incremental lines?

Enamel is composed of ______ hydroxyapatite.

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

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

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

Which statement is true?

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

Each enamel rod is formed by a single ameloblast.

Which of the following best defines the neonatal line?

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

Perikymata are found in which location?

Enamel varies in density and hardness.

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

Enamel is an impermeable tissue.

Ameloblasts deposit 4 µm of enamel rods daily.

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

Etching the surface of enamel stimulates remineralization.

The surface of the enamel rod is called the rod

Development and Structure of Cells and Tissues

Structure and Function of Cells, tissues, and Organs

Development of the Oral Facial Region

Development of the Face and Palate

Development of Teeth

Eruption and Shedding of Teeth

Dentin

Dental Pulp

Cementum

Periodontium: Periodontal Ligament

Periodontium: Alveolar Process and Cementum

Temporomandibular Joint

Oral Mucosa

Salivary Glands and Tonsils

Biofilms

Filters

Exam 7: Enamel

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

Which of the following best defines perikymata?

Which of the following best defines incremental lines?

Enamel is composed of ______ hydroxyapatite.

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

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

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

Which statement is true?

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

Each enamel rod is formed by a single ameloblast.

Which of the following best defines the neonatal line?

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

Perikymata are found in which location?

Enamel varies in density and hardness.

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

Enamel is an impermeable tissue.

Ameloblasts deposit 4 µm of enamel rods daily.

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

Etching the surface of enamel stimulates remineralization.

The surface of the enamel rod is called the rod

Development and Structure of Cells and Tissues

Structure and Function of Cells, tissues, and Organs

Development of the Oral Facial Region

Development of the Face and Palate

Development of Teeth

Eruption and Shedding of Teeth

Dentin

Dental Pulp

Cementum

Periodontium: Periodontal Ligament

Periodontium: Alveolar Process and Cementum

Temporomandibular Joint

Oral Mucosa

Salivary Glands and Tonsils

Biofilms

Filters