Question 1

The cap stage begins when the concavity of the tooth buds becomes slightly concave.

Accepted Answer

A) True 
 B)False  True

Question 2

The clefting that occurs in the thickened vestibular lamina eventually becomes a mucogingival groove.The vestibular lamina is a thickening of oral epithelium in a lingual direction.

Accepted Answer

A)   Both statements are true.
B)   The first statement is true;the second statement is false.
C)   The first statement is false;the second statement is true.
D)   Both statements are false. C

Question 3

MATCHING
An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation.
-Successional lamina

Accepted Answer

A)  Forms permanent incisors,canines,and premolars
B)  Forms cementum
C)  Forms enamel
D)  Forms mucobuccal fold
E)  Forerunner of primary tooth germF) Forms pulp A

Question 4

The cells of the inner enamel epithelium (IEE)are structurally similar to the cells of the outer enamel epithelium (OEE)because they both originate from the basal layer of the oral epithelium.

Accepted Answer

A)   Both the statement and the reason are correct and related.
B)   Both the statement and the reason are correct but are NOT related.
C)   The statement is correct,but the reason is NOT correct.
D)   The statement is NOT correct,but the reason is correct.
E)   NEITHER the statement NOR the reason is correct.

Question 5

The dental sac is composed of several layers of flat mesodermal cells that partially surround the dental papilla and enamel organ.The dental sac is another name for the dental lamina.

Accepted Answer

A)   Both statements are true.
B)   The first statement is true;the second statement is false.
C)   The first statement is false;the second statement is true.
D)   Both statements are false.

Question 6

MATCHING
An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation.
-Dental sac

Accepted Answer

A)  Forms permanent incisors,canines,and premolars
B)  Forms cementum
C)  Forms enamel
D)  Forms mucobuccal fold
E)  Forerunner of primary tooth germF) Forms pulp

Question 7

MATCHING
An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation.
-Vestibular lamina

Accepted Answer

A)  Forms permanent incisors,canines,and premolars
B)  Forms cementum
C)  Forms enamel
D)  Forms mucobuccal fold
E)  Forerunner of primary tooth germF) Forms pulp

Question 8

Premolars are successional because they develop from a posterior growth of the dental,or general,lamina.

Accepted Answer

A)   Both the statement and the reason are correct and related.
B)   Both the statement and the reason are correct but are NOT related.
C)   The statement is correct,but the reason is NOT correct.
D)   The statement is NOT correct,but the reason is correct.
E)   NEITHER the statement NOR the reason is correct.

Question 9

At about the sixth embryonic week,there is a continued thickening in the dental lamina.These localized thickenings correspond to the positions of the 20 teeth of the future primary dentition.

Accepted Answer

A)   Both statements are true.
B)   The first statement is true;the second statement is false.
C)   The first statement is false;the second statement is true.
D)   Both statements are false.

Question 10

The first stage of development of enamel organ is the cap stage.

Accepted Answer

A) True 
 B)False

Question 11

MATCHING
An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation.
-Enamel organ

Accepted Answer

A)  Forms permanent incisors,canines,and premolars
B)  Forms cementum
C)  Forms enamel
D)  Forms mucobuccal fold
E)  Forerunner of primary tooth germF) Forms pulp

Question 12

Without thickening of the vestibular lamina in an occlusal direction the vestibule would not exist because clefting or splitting of the epithelium would not occur.

Accepted Answer

A)   Both the statement and the reason are correct and related.
B)   Both the statement and the reason are correct but are NOT related.
C)   The statement is correct,but the reason is NOT correct.
D)   The statement is NOT correct,but the reason is correct.
E)   NEITHER the statement NOR the reason is correct.

Question 13

The stratum intermedium develops during which stage?

Accepted Answer

A)   Early bud
B)   Late bud
C)   Cap
D)   Bell

Question 14

MATCHING
An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation.
-Dental papilla

Accepted Answer

A)  Forms permanent incisors,canines,and premolars
B)  Forms cementum
C)  Forms enamel
D)  Forms mucobuccal fold
E)  Forerunner of primary tooth germF) Forms pulp

Question 15

The cells between the dental papilla and the outer enamel epithelium (OEE)compose the stellate reticulum.Originating from deep layers of the oral epithelium,cells of the stellate reticulum are mesenchymal in origin.

Accepted Answer

A)   Both statements are true.
B)   The first statement is true;the second statement is false.
C)   The first statement is false;the second statement is true.
D)   Both statements are false.

Question 16

The outermost part of the structure of the cap stage is the outer enamel epithelium (OEE).This tissue,a continuation of the basal layer of oral epithelium,is composed of predominately pyramidal and conical-shaped cells.

Accepted Answer

A)   Both statements are true.
B)   The first statement is true;the second statement is false.
C)   The first statement is false;the second statement is true.
D)   Both statements are false.

Question 17

The dental lamina thickens first at the anterior midline.

Accepted Answer

A) True 
 B)False

Question 18

The successional lamina forms all permanent teeth EXCEPT for one type.Which type is the EXCEPTION?

Accepted Answer

A)   Incisors
B)   Canines
C)   Premolars
D)   Molars

Question 19

Skin,hair,enamel,and cementum can be adversely affected by ectodermal dysplasia because this condition causes poor development of structures arising from ectoderm.

Accepted Answer

A)   Both the statement and the reason are correct and related.
B)   Both the statement and the reason are correct but are NOT related.
C)   The statement is correct,but the reason is NOT correct.
D)   The statement is NOT correct,but the reason is correct.
E)   NEITHER the statement NOR the reason is correct.

Question 20

Enamel organ originates from the

Accepted Answer

A)   endoderm
B)   ectoderm
C)   mesoderm
D)   ameloblasts

Exam 19: Dental Lamina and Enamel Organ

The cap stage begins when the concavity of the tooth buds becomes slightly concave.

The clefting that occurs in the thickened vestibular lamina eventually becomes a mucogingival groove.The vestibular lamina is a thickening of oral epithelium in a lingual direction.

MATCHING An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation. -Successional lamina

The cells of the inner enamel epithelium (IEE) are structurally similar to the cells of the outer enamel epithelium (OEE) because they both originate from the basal layer of the oral epithelium.

The dental sac is composed of several layers of flat mesodermal cells that partially surround the dental papilla and enamel organ.The dental sac is another name for the dental lamina.

MATCHING An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation. -Dental sac

MATCHING An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation. -Vestibular lamina

Premolars are successional because they develop from a posterior growth of the dental,or general,lamina.

At about the sixth embryonic week,there is a continued thickening in the dental lamina.These localized thickenings correspond to the positions of the 20 teeth of the future primary dentition.

The first stage of development of enamel organ is the cap stage.

MATCHING An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation. -Enamel organ

Without thickening of the vestibular lamina in an occlusal direction the vestibule would not exist because clefting or splitting of the epithelium would not occur.

The stratum intermedium develops during which stage?

MATCHING An understanding of the formation of the dental lamina and enamel organ provides dental professionals with a foundation in embryology.Match each descriptive term with its appropriate anatomic formation. -Dental papilla

The cells between the dental papilla and the outer enamel epithelium (OEE) compose the stellate reticulum.Originating from deep layers of the oral epithelium,cells of the stellate reticulum are mesenchymal in origin.

The outermost part of the structure of the cap stage is the outer enamel epithelium (OEE) .This tissue,a continuation of the basal layer of oral epithelium,is composed of predominately pyramidal and conical-shaped cells.

The dental lamina thickens first at the anterior midline.

The successional lamina forms all permanent teeth EXCEPT for one type.Which type is the EXCEPTION?

Skin,hair,enamel,and cementum can be adversely affected by ectodermal dysplasia because this condition causes poor development of structures arising from ectoderm.

Enamel organ originates from the