The internal anatomy of the mesiobuccal root (MB) of maxillary molars is complex and commonly presents 2 main root canals, named MB1 and MB2, but also a high incidence of fine anatomical structures, which may include the presence of a 'middle mesial canal', the so-called MB3. MB3 canal can be defined as a third main root canal located in between MB1 and MB2 main canals of the MB root of maxillary molars. Literature regarding morphological description of MB3 canal is scarce and most of the information comes as a clinical report or an incidental finding of laboratorial studies, but not as the main topic of the research.
More information about this topic in a well-designed micro-CT study is going to be published very soon...
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