Which one of the following morphological characteristic is representative of all posterior maxillary teeth?: (A) Marked mesial concavity on crowns and roots., (B) Tips of cusps are well within the confines of the root trunks., (C) From mesial/distal aspect, crowns are rhomboidal in shape., (D) From mesial/distal aspect, all maxillary posterior crowns are trapezoidal with shortest uneven side toward occlusal surface.
Answer is D. From MD aspect, all posterior teeth have a trapezoidal outline with shortest uneven side toward the occlusal surface.
A, Present posteriorily on first premolar;
B, Exceptions may be the DB root of the maxillary second molar;
C, From mesial and distal aspect, all posterior mandibular teeth, not maxillary posterior teeth, have a rhomboidal outline