Section Iii Mandibular Teeth 418 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.

mesial view distal view

Figure 4-28. Mandibular right central incisor.

mesial view distal view

Figure 4-28. Mandibular right central incisor.

c. Mesial Surface. The mesial surface is triangular in shape. It is almost flat in its entire length. The contact area is located in the incisal third.

d. Distal Surface. The distal surface resembles the mesial surface except for being slightly more convex.

e. Incisal Edge. The incisal edge appears slightly curved from mesial to distal. Its thickness increases with wear.

f. Root. The root is narrow mesiodistally, but broad faciolingually. The apical portion may have a slight distal inclination.

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