Summary:
Purpose: to determine MB root canal configuration and incidence of MB2 in maxillary 1st molar.
N=208 extracted maxillary 1st molars.
Materials/Methods:
•from the mesial side of the tooth, teeth were sectioned in buccolingual direction using coarse sandpaper disk.
•Then they were viewed and classified.
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 (aid in communication).


