and second molars is that the occlusal surface of the
second molar has no fifth cusp.
RootsThe mandibular second molar has two
roots that are smaller than those of the first molar.
The mandibular third molar (tooth #17 or #32),
illustrated in figure 4-47, is the eighth tooth from the
midline. It appears in many forms, sizes, and shapes.
Since its function is similar to that of the other two
mandibular molars, its general appearance is the same.
It has smaller surfaces, more supplemental grooves,
and four or five cusps, which are not so sharply
differentiated as those of the first two molars.
RootsThe roots, generally two in number, are
shorter in length and tend to be fused together. In many
instances they show a distinct distal curve.
GLOSSARY OF UNIQUE DENTAL
The following list will be helpful to you in
understanding some of the anatomical terms used in
CuspA pointed or rounded elevation of enamel
found on cuspids and on the chewing surfaces of
bicuspids and molars.
CingulumFound on the lingual aspect of an anterior
tooth. It is a convex mount of enamel localized to the
cervical one-third of the crown.
FissureA linear fault that sometimes occurs in a
developmental groove by incomplete or imperfect
joining of the lobes. A pit is usually found at the end of a
developmental groove or a place where two fissures
FossaA rounded or angular depression of varying
Figure 4-47.Surfaces of mandibular third molar.
size found on the surface of a tooth.