Each of the Following is a Characteristic of Contact Areas

Question

Each of the following is a characteristic of contact areas EXCEPT one.Which one is the EXCEPTION?
A) Stabilize teeth
B) Discourage food impaction
C) Are located in middle third of tooth
D) Protect interdental papilla
E) All are true.

Accepted Answer

Contact areas are located in different positions on the proximal surfaces depending on the location of teeth.A helpful rule: the more posterior the tooth,then the more cervical is the location of its contact area.From a facial view the contact areas of anterior teeth are located closer to the incisal surfaces of teeth whereas the posterior teeth have their contact areas nearer to the middle third of teeth.Viewed occlusally,the contact areas of anterior teeth are located in the center between the labial and lingual surfaces of the tooth.Also viewed occlusally,posterior teeth have contact areas slightly buccal to the center of teeth.Functional contact areas perform a multitude of protective functions including those listed in the question.