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Proximal surfaces

M

D

  • The crown is smaller than that of lower 6
  • The cervical R is less developed.

Anatomical landmarks

Elevations

  • 4 triangular ridges.
  • 2 marginal ridges.

M cusps are larger than D cusps why????????

Occlusal aspect

Lingual aspect

ML

DL

  • Two cusps ML and DL
  • Lingual DG

The geometric O.L is rectangular.

Lower 7

Buccal aspect

  • MD dimension is larger than BL

Smaller than lower 6 and has two buccal cusps,MB and DB

MB

DB

  • MB is wider.
  • Distal and lingual convergence.
  • Buccal DG ends in a buccal pit.
  • The roots are less diverge and more parallel.
  • The root trunk is longer than that of lower 6

Depressions

1 major central fossa and pit

2 minor fossae with pits (triangular fossae)

Central, B and L dev. grooves form a typical Cross pattern.

Supplemental grooves.

Lower third molar

B

L

O

M

D

Lower second and third molars

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