(5) Oblique ridge. The oblique ridge (see figure 4-14) is a transverse ridge
of enamel found only on maxillary molars. It connects the mesiolingual cusp with the
distofacial cusp. This ridge is important for charting and for operative dentistry, since
the dentist tries to preserve this strong ridge whenever possible.
Figure 4-14. Oblique ridge.
(1) Fossa. A fossa (see figure 4-15) is a rounded or wedge-shaped
depression on the surface of a tooth.
Figure 4-15. Fossa.