Numerous fissures and grooves cover the occlusal
surface. There is no distinct oblique ridge.
Root SurfaceThe root may have from one to as
many as eight divisions. These divisions are usually
fused and very often curved distally.
MANDIBULAR FIRST MOLAR
The mandibular first molar (tooth #19 or #30),
illustrated in figures 4-44 and 4-45, is the sixth tooth
from the midline. It is the first permanent tooth to
Facial SurfaceThe facial surface has two
grooves: the facial groove, which is an extension of the
facial groove from the occlusal surface and the
distofacial groove, an extension of the distofacial
groove from the occlusal surface.
Occlusal SurfacesThe occlusal surface has five
cusps (fig. 4-45). The fifth cusp is called the distal
RootsThe tooth has two roots, a mesial and a
MANDIBULAR SECOND MOLAR
The mandibular second molar (tooth #18 or #31),
illustrated in figure 4-46, is the seventh tooth from the
Figure 4-44.Surfaces of mandibular first molar.
Figure 4-45.Features of an occlusal surface of mandibular
Figure 4-46.Surfaces of mandibular second molar.
Facial SurfaceThe facial surface has only one
groove, the facial groove, which arises on the occlusal
surface, extends over the facial margin onto the facial
Occlusal SurfacesThe greatest difference
between the occlusal surfaces of the mandibular first