Vertucci Classification Sert and Bayiril

Gulabivala’s supplemental canal configurations

Type I Type II Type III Type IV

Type V Type VI Type VII

Walker Weine

Weine’s classification of canal configurationsType I – a single canal extends from the pulp chamber to the apical foramen.Type II – two separate canals leave the chamber but merge before the apex to form one

apical foramen.Type III – two separate canals leave the chamber and exit the root in separate apical

foramina.Type IV – a single canal leaves the chamber, but divides before the apex into two separate canals with separate apical foramina.

Canals of MB root Canals of DB root Canals of palatal root MB1: mesiobuccal (MB) DB1: distobuccal (DB) Palatal (P) MB2: second mesiobuccal (SMB) DB2: second distobuccal (SDB) Mesiopalatal (MP)

MB3: mesiobuccopalatal (MBP) DB3: distobuccopalatal (DBP) Distopalatal (DP)

Yeung Yi Hsu classification isthmi

Type I Two or Three canals with no communications.

Type II Two canals with definite connection between them.

Type III Three canals that are present with a definite connection. (incomplete "C" shaped canals with three canals are also included).

Type IV Canals extended into the isthmus area.

Type V True connections or corriodor throughout the section exist.