20.
All of the following tooth surfaces are axial surfaces EXCEPT the ____________
surface.
a. Facial.
b. Lingual.
c.
Mesial.
d. Distal.
e. Occlusal.
21.
Each crown is divided into horizontal thirds. Select the appropriate terminology for
posterior teeth.
a. Facial, middle, and lingual.
b. Occlusal, middle, and cervical.
c.
Mesial, middle, and distal.
d. Cervical, middle, and apical.
e. Incisal, middle, and gingival.
22.
In the imaginary division of teeth for descriptive purposes, the apical third of a
mandibular tooth lies in the:
a. Upper third of the crown.
b. Upper third of the root.
c.
Middle third of the crown.
d. Lower third of the root.
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