Topics in Tooth Morphology

Lower 4 (First Premolar)

From the DentTest dentistry textbook. Last updated 6 August 2026.

Key features:

Aspect

Area

Features

Buccal

Crown

  • Mesial slope shorter than distal slope

Cusps

  • Two cusps; 1 buccal, 1 lingual

  • Buccal cusp larger than lingual cusp

Root

  • Single root curved distally

Lingual

Cusps

  • Lingual cusp more mesial than buccal cusp

Mesial/distal

Cusps

  • Buccal cusp tilts lingually

  • Lingual cusp overhangs root

Occlusal

Crown

  • Shape: rounded square

  • Fossae: two fossa, distal > mesial