Abstract: The MB2 canal or as we call it master reason of failure of root canal treatment of upper molars is a very common anatomical finding that presents with a higher percentage than we can even know in our studies and reviews.
Still their prevalence percentage is not the nightmare we face, the real nightmare that every clinician fears is after locating to negotiate and shape in a safe repeatable and predictable way.
Despite the debate of the necessity of doing pre operative CBCT that may help or not locating the MB2
Zoning technique is one of the promising shaping techniques that we can apply in Endodontics and depending mainly on dividing the canal into three main thirds Coronally, Middle and Apical thirds especially in dealing with multi-planar curvatures.
I will clarify how to locate, negotiate and shape MB2 CANAL in a safe predictable easy way.
Objectives: Clinicians should be familiar with all options in facing MB2 canal cases even before referral if needed.
Clinicians should be familiar to locate and negotiate MB2 canals.
Clinicians should be able to understand zone technique and its application in MB2 canal shaping.