Question

Which cusp on a maxillary first molar has two ridges: one that forms part of a transverse ridge and the other that forms part of an oblique ridge?

A) Mesiolingual cusp
B) Mesiofacial cusp
C) Distolingual cusp
D) Distofacial cusp

Answer 1

The maxillary first molar has four cusps, and the cusp with two ridges forming part of a transverse ridge and an oblique ridge is the Mesiofacial cusp.

Step-by-step explanation:

The maxillary first molar has four cusps: the mesiolingual cusp, mesiofacial cusp, distolingual cusp, and distofacial cusp. The cusp in question, which has two ridges, one forming part of a transverse ridge and the other forming part of an oblique ridge, is the Mesiofacial cusp. The transverse ridge is formed by the connection between the mesiofacial cusp and the distofacial cusp, while the oblique ridge is formed by the connection between the mesiofacial cusp and the mesiolingual cusp.