Morphological Study of Root Canals of Maxillary Molars by Cone-Beam Computed Tomography

Table 2

Classification of the root canal system proposed by Weine et al. [14] and Vertucci [15].

Morphological type by Weine et al. [14]	Description
Type I	Single canal from the pulp chamber to the apex.
Type II	Two separate canals leave the pulp chamber and join short of the apex to form one canal.
Type III	Two separate and distinct canals from the pulp chamber to the apex.
Type IV	A single canal leaves the pulp chamber and divides into two canals with two separate foramina.
Morphological type by Vertucci [15]	Description
Type I	A single canal extending from the pulp chamber to the apex.
Type II	Two canals leave the pulp chamber and join short of the apex to form a single canal.
Type III	A single canal leaves the pulp chamber, divides into two inside the root, and then merges to form one canal.
Type IV	Two separate and distinct canals extending from the pulp chamber to the apex.
Type V	A single canal leaves the pulp chamber and divides into two canals with separate apical foramina.
Type VI	Two separate canals leave the pulp chamber, merge in the body of the root, and redivide short of the apex to exit as two distinct canals.
Type VII	A single canal leaves the pulp chamber, divides into two canals that then merge in the middle third of the root, and finally redivide into two distinct canals short of the apex.
Type VIII	Three separate canals extending from the pulp chamber to the apex.