| |
Back
MAXILLARY THIRD MOLAR | Up
Dental Volume 1 - Dentist training manual for military dentists | Next
MANDIBULAR THIRD MOLAR |
Occlusal Surface
Numerous fissures and grooves cover the occlusal
surface. There is no distinct oblique ridge.
Root Surface—The 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
erupt.
Facial Surface—The 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 Surfaces—The occlusal surface has five
cusps (fig. 4-45). The fifth cusp is called the distal
cusp.
Roots—The tooth has two roots, a mesial and a
distal.
MANDIBULAR SECOND MOLAR
The mandibular second molar (tooth #18 or #31),
illustrated in figure 4-46, is the seventh tooth from the
midline.
Figure 4-44.—Surfaces of mandibular first molar.
Figure 4-45.—Features of an occlusal surface of mandibular
first molar.
Figure 4-46.—Surfaces of mandibular second molar.
Facial Surface—The facial surface has only one
groove, the facial groove, which arises on the occlusal
surface, extends over the facial margin onto the facial
surface.
Occlusal Surfaces—The greatest difference
between the occlusal surfaces of the mandibular first
4-22
|
