The crown of a tooth that is divided lengthwise with the division being parallel to the occlusal or incisal surface of the tooth has which of the following divisions?
A)Mesial third, middle third, and distal third
B)Occlusal third, middle third, and cervical third
C)Facial third, middle third, and lingual third
D)Incisal third, middle third, and lingual third

Question

Quizplus · Accepted Answer

The mesial,middle,and distal thirds compose the mesiodistal division.This division is lengthwise in a mesial-to-distal (front-to-back)direction.
The crosswise division parallel to the occlusal or incisal surface is the occlusocervical division.It consists of the occlusal,middle,and cervical thirds.
The facial,middle,and lingual thirds compose the buccolingual division.This division is lengthwise in a labial- or buccal-to-lingual direction.
There is no division that includes incisal,middle,and lingual thirds.

The Crown of a Tooth That Is Divided Lengthwise with the Division