shaped tooth, the canals are located in a 180° arc. The mesial buccal canal is MUCH more distal than you see in the more common 2 rooted mandibular second molar.There has been a great deal of research focused on root canal anatomy (I’m sure you remember TRYING to stay awake in dental anatomy class) but the results from various studies don’t always agree with each other. One study will say that the upper first molar has an MB2 canal 50% of the time, and the next study 95%. These discrepancies are a result of the study design. Some studies simply have too few NUMBERS to give an accurate statistic. Older studies relied on grinding or sectioning the teeth, which destroyed the anatomy they were trying to see. Many of the older studies didn’t involve microscopes, so some canals might have been missed. Don’t let the differences in the research confuse you. It is important to look at the numbers and try to understand the anatomy of the root canal space in each tooth. Averaging the numbers from the studies MAY give the best idea of canal anatomy. Recent studies use micro-CT scanning, which can be assembled into 3-D IMAGES. This is the process that Dr. Buchanan uses to produce the 3-D images on this Web site. Brown and Herbranson (3-D Tooth Atlas) have also produced an amazing compilation of canal anatomy using tomography.HOPE IT HELPS YOU.MARK ME AS BRAINLIEST .