Figure 2.

Diagrammatic representations of the various root and canal configurations in maxillary molars named according to the proposed nomenclature. (a) Names of the canals will not be altered if all canals are located in their respective principle roots; MB: mesiobuccal, P-MB: palate-mesiobuccal, DB: distobuccal, and P: palatal. (b) Presence of a palatally located additional root alters the naming of the canals to signify the additional root by use of the suffix “R.” P-MBR signifies a palato-mesiobuccal canal in a palato-mesiobuccal root. (c) Maxillary molar with a C-shaped canal involving the DB and P canals which is denoted as C-DB-P. (d) Maxillary molar with a single root and a central canal denoted as Cn. (e) Illustration of the palatal root section of a palatal canal with a trifurcation, denoted as tri-P. (f) Maxillary molar with fused buccal roots containing distinct MB and DB canal denoted by addition of the letter F to the names of the canals in the fused root, that is, MBF, and DBF.