Lingual View

The crown and root both taper towards the lingual. The lingual aspect of crown is a series of convexities (mesial marginal ridge, distal marginal ridge, cingulum and the lingual aspect of the incisal ridge called the linguo-incisal ridge) and a concavity (lingual fossa). The cervical line is convex.

Mesial Outline of Crown

The mesial outline is convex. The mesial crest of curvature is at the junction of the middle and incisal thirds of the crown.

Distal Outline of Crown

The distal outline is more convex than the mesial outline and the distal crest of curvature is in the middle third of the crown.

Incisal Ridge

The incisal ridge is convex and curved mesiodistally. The linguo-incisal ridge is visible in this view.

Lingual Surface of Crown

The cingulum is present in the cervical third of the crown. The lingual anatomy of crown is characterized by the convex cingulum, mesial and distal marginal ridges and incisal ridge. The convexities of the lingual surface border the lingual fossa which is a large, centrally located region. Developmental pits and grooves can be present on the lingual surface of the crown (cingulum to lingual fossa) and can extend onto the root as a radicular groove.

Root

The root is convex on its lingual surface and tapers lingually consistent with its conical shape in cross-section.