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20. How many teeth (out of 32) in the normal dentition oppose only ONE other tooth?

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A. None B. 1

C. 2 D. 4


ANS.D.


Because of the shift of the mandibular teeth in a mesial direction due to the smaller size of the anterior teeth, most teeth have two opposing teeth. That is, they oppose their counterpart in the other arch, and a tooth either mesial or distal to that counterpart. There are two classes of exceptions. One of the exceptions is the mandibular central incisors. These two teeth (#24 and #25) oppose only the maxilary centrals (#8 and #9). The other exception is the maxillary third molars (#1 and #16), which oppose only the mandibular third molars.

Note that the mandibular third molars oppose both the maxillary second and third molars.


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