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Central fossa—Centrally located depression found on
the occlusal surface of molars and mandibular second
bicuspids. The other bicuspids have mesial and distal
triangular fossa, but do not have a central fossa.
Lingual fossa—Irregular, shallow depression found on
the lingual surfaces of an incisor or cuspid.
Triangular fossa—Located adjacent to the marginal
ridges on the occlusal surfaces of posterior teeth. Two
types of triangular fossae are mesial and distal.
Groove—A small linear depression on the surface of a
tooth.
Developmental groove-Fissure between the cusps on
the crown of the tooth. Cusp tips are the initial site
where enamel develops. As the enamel develops and
spreads laterally, it touches enamel developing from
other cusps.
This junction forms a developmental
groove. Such grooves appear on the labial, buccal, and
lingual surfaces, and are least apparent on the labial
aspect of anteriors.
Supplemental groove—A minor, auxiliary groove that
branches off from a much more prominent
developmental groove. They do not represent the
junction of primary tooth parts and gives the occlusal
surface a wrinkled appearance.
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