Lingual View

Both the crown and root 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 linguoincisal ridge) and a concavity (lingual fossa). The cervical line is convex.

Mesial Outline of Crown

The mesial outline is slightly convex (much less so compared to the distal outline) and the mesial crest of curvature is at the mesioincisal corner of the crown.

Distal Outline of Crown

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

Incisal Ridge

The incisal ridge from the lingual view is convex and the linguo-incisal ridge is visible.

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. These convexities of the lingual surface border the concave lingual fossa which is a large, centrally located region. Developmental grooves can be present on the lingual surface of the crown (cingulum to lingual fossa).

Root

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