Question 1

Enamel is an impermeable tissue.

Accepted Answer

A) True 
 B)False  False

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

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 mm 
A)  1 µm 
B)  9 µm 
C)  2.5 mm 
D)  4.5 mm C

Question 4

Each enamel rod is formed by a single ameloblast.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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

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

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

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

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

Question 14

Name the organic component of enamel.

Accepted Answer

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

Question 15

Enamel is composed of ______ hydroxyapatite.

Accepted Answer

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

Question 16

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 17

Ameloblasts travel along parallel paths to produce straight enamel rods.

Accepted Answer

A) True 
 B)False

Question 18

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 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 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Enamel is an impermeable tissue.

Which of the following best defines perikymata?

Enamel is approximately ______thick at the occlusal or incisal surface.

Each enamel rod is formed by a single ameloblast.

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

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

Two ameloblast cells form the enamel rod _________.

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

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

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

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

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

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

Name the organic component of enamel.

Enamel is composed of ______ hydroxyapatite.

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

Ameloblasts travel along parallel paths to produce straight enamel rods.

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

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

Which of the following best defines incremental lines?

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 the 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 is an impermeable tissue.

Which of the following best defines perikymata?

Enamel is approximately ______thick at the occlusal or incisal surface.

Each enamel rod is formed by a single ameloblast.

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

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

Two ameloblast cells form the enamel rod _________.

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

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

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

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

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

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

Name the organic component of enamel.

Enamel is composed of ______ hydroxyapatite.

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

Ameloblasts travel along parallel paths to produce straight enamel rods.

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

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

Which of the following best defines incremental lines?

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 the Teeth

Dentin

Dental Pulp

Cementum

Periodontium: Periodontal Ligament

Periodontium: Alveolar Process and Cementum

Temporomandibular Joint

Oral Mucosa

Salivary Glands and Tonsils

Biofilms

Filters