Lobe Forms and Geometric Concepts

Question 1

What is a defined, recessed, or concave area on the surface of a tooth found between two primary parts of a crown or root called?

Answer 1

Developmental depression

Question 2

Primary anterior teeth form from two centers of calcification. There are no mamelons and there are no developmental depressions.

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

Answer 2

D. The first statement is false; the second statement is true

Question 3

The geometric diagram that depicts the proximal surface on a permanent mandibular second molar is?

Answer 3

Rhombiod

Question 4

Four embrasures surround each contact area. They are air spaces labeled facial, lingual, occlusal or incisal, and gingival.

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

Answer 4

C. Both statements are true

Question 5

The geometric diagram that depicts the facial or lingual aspect on a permanent maxillary molar is?

Answer 5

Trapezoid