While it can be difficult to locate, there is a fourth canal in upper first molars known as the MB2 canal. Dentists ask me about this canal and where to find it during my lectures on endodontics all the time.
The MB2 is located within the broad mesiolingual root, and according to literature, is approximately 1.82 mm palatal to MB1. In many cases, this canal is very elusive because of its small size and unusual placement within the pulp chamber. When looking with a highspeed, improper vision can make it difficult to see the canal. This pertains to the tip of the access bur being visually blocked by the head of the motor, making it very difficult to trough along the chamber safely to find the canal.
A remedy to this problem is to use a longer bur shank that moves the tip away from the head of the motor and gives you proper vision to see what the tip is actually doing!
Munce Discovery Burs are your solution to this problem. With a long skinny shank and several tip sizes from ¼ to 4 round, there are plenty of choices. The burs can be ordered in deep and shallow troughers, giving you immense flexibility, depending on the case.
If vision is your issue when looking for canals, Munce Discovery Burs are your solution.
Click here for more information on Munce Discovery Burs from CJM Engineering.