Mesial View

The crown is triangular in shape or wedge-shaped like all of the anterior teeth from this view with the apex of the triangle at the incisal ridge and the base of the triangle at the cervix of the tooth.

Facial Outline of Crown

The crest of curvature labially is located in the cervical third of the crown. The labial outline of the crown is convex especially in the cervical third. The crown is less convex from the crest of curvature to the incisal ridge.

Lingual Outline of Crown

The cingulum is convex in the cervical third of the crown. From the cingulum to the incisal ridge, the lingual crown surface is concave. The lingual surface again becomes convex approaching the incisal ridge.

Cervical line

Note the greater curvature of the cervical line on the mesial surface of the maxillary central incisor compared to the maxillary lateral incisor. At approximately 3.5mm, the curvature of the cervical line on the mesial surface of the permanent maxillary central incisor exhibits the greatest vertical extent of any surface of any tooth in the dentition.

Mesial Surface of the Crown

The crown is generally convex in this view.

Incisal ridge

The location of the incisal ridges of the permanent maxillary incisors are described as being on a line bisecting the root or slightly labial to a line bisecting the root. This should be compared to the mandibular incisors which have the incisal ridge lingual to a line bisecting the root. This feature that allows differentiation of teeth in a class between the arches is called an arch trait.

Root

The root is conical in form and the majority of the root taper occurs in the apical half of the root.