English · Svenska · Deutsch · Español · Latina

Maxillary right first premolar

A two-cusped (buccal and palatal) premolar. It usually has two roots, which distinguishes it from most other premolars.

FDI: 14
Universal: 5
Palmer: UR4
Roots: Usually two (buccal and palatal)
Root canals: Usually two
Eruption: About 10–11 years

Form and anatomy

The crown has a buccal cusp and a slightly shorter palatal cusp, and seen from the occlusal side its outline is hexagonal. Unusually, the buccal cusp tip sits a little distal to centre, because its mesial cusp ridge is the longer one. A developmental depression on the mesial surface of the crown continues onto the root, and a groove often crosses the mesial marginal ridge; both make this surface harder to restore and clean. The central groove is long and runs mesiodistally between the two cusps. Most teeth have two roots, one buccal and one palatal, which may separate in the middle or apical third; single-rooted and occasional three-rooted forms also occur. Each root usually has its own canal, and the thin, curved roots call for care during extraction and root canal treatment.

Function

Transitions from tearing to grinding; holds and crushes food.

Clinical relevance

Frequently extracted for orthodontic space. Two canals are typical, so both must be located in endodontic treatment.

Neighbouring teeth

Mesial neighbour: Maxillary right canine
Distal neighbour: Maxillary right second premolar
Same tooth, other side: Maxillary left first premolar
Opposing tooth: Mandibular right first premolar

This text is a draft and has not yet been reviewed by a dental professional. Educational reference only, not for diagnosis or treatment.