The first maxillary premolar contains two cusps called the buccal and lingual cusps. The lingual cusp is shorter and smaller, and it is slightly displaced to the mesial surface. The highest point of each cusp is called the cusp apex.
The maxillary first premolar has two cusps, a buccal and a lingual, each being sharply defined. The buccal cusp is usually about 1 mm longer than the lingual cusp. The crown is angular, and the buccal line angles are prominent.
The maxillary first premolar is the
first posterior tooth in the maxillary dental arch. There are four premolars in the maxillary dental arch two in each quadrant. The term premolar is used for these teeth because these teeth are anterior to the permanent molars. The maxillary first premolar has two cusps one buccal and one palatal cusp.
There are two cusps on maxillary first premolars, and the buccal (closest to the cheek) cusp is sharp enough to resemble the prehensile teeth found in carnivorous animals. There are no deciduous maxillary premolars. Around 10-11 years of age, the primary molars are shed and the permanent premolars erupt in their place.
The first maxillary premolar is
narrower mesiodistally than it is buccolingually, and it has an oval occlusal outline with a very sharp mesiobuccal line angle. From the height of the contour, the buccal outline of this tooth is flatter, but the lingual is more rounded.