Upper premolars

The upper premolars have an outline similar to a rectangle or an ellipse, and their vestibular surfaces resemble the labial surface of a canine. The approximal surfaces have a rectangular shape and are convex at the point of contact (on the contrary, they are concave in the cervical direction).

First upper premolar
Two cusps – the buccal cusp points distally and is higher and sharper than the palatal cusp. As the only one of all premolars, it has the largest percentage of cases (60%)

two roots and 92% two canals. The roots are gracile and twisted - difficult to treat endodontically. Frequent extraction for orthodontic reasons. This is pillar II. class according to Voldřich.

Second upper premolar
It is smaller in volume than the first premolar, to which it is very similar except for a few differences. Unlike the first upper premolar, both cusps are the same height. In 90%, it has only one root, which has a close relationship with the maxillary cavity. Like all premolars, they belong to pillars II. class according to Voldřich.

related articles

 * Morphology of teeth
 * Lower premolars