4-17. MAXILLARY THIRD MOLAR
The maxillary third molar (figure 4-27) may occur in a great variety of forms. In
its most common form, it resembles the maxillary second molar but is smaller in all
dimensions. It is often called the wisdom tooth.
Figure 4-27. Maxillary right third molar.
Section III. MANDIBULAR TEETH
4-18. MANDIBULAR CENTRAL INCISOR
The mandibular central incisor (figure 4-28) is located adjacent to the median line
in the anterior portion of the mandibular dental arch. Its mesial surface contacts the
mesial surface of the central incisor of the opposite side. It is the smallest and most
symmetrical of all teeth. Developmental grooves are indistinct.
a. Facial Surface. The facial surface is flat in the incisal two-thirds and convex
in the cervical third. It is widest near the incisal edge. The incisal edge forms a straight
line at nearly right angles to the long axis and forms slightly acute angles with the
mesial and distal surfaces.
b. Lingual Surface. The lingual surface is narrower than the facial surface.
The incisal two-thirds is concave and bounded by mesial and distal marginal ridges. In
the cervical third, or cingulum area, it is convex.