Canal Configuration in the Mesiobuccal Root of the Maxillary First Molar and Its Endodontic Significance

By Weine F, Healey H, Gerstein H, Evanson L.

Date: 01/1969
Journal: Oral Pathology


•Purpose: to determine MB root canal configuration and incidence of MB2  in maxillary 1st molar.

•N= 208 extracted maxillary 1st molars.


•The MB roots were sectioned from a mesial approach in a BL direction, using a coarse sandpaper disk.

•The root canals were exposed, when possible, from the roof of the pulp chamber to the apex, and the typical configurations were classified and tabulated.

Most highlighted Results: 

3 canals configuration were observed: 

•Type I: single canal/single foramen.(48.5%).

•Type II: 2 canals/ 1 foramen, joining 1-4 mm from apex.(37.5%).

•Type III: 2 canals/2 foramina.(14%). •type IV: 1 canal / 2 foramina

Clinical significance:

•Established simple classification system to help in communication.