Research progress on the middle mesial root canal in the mandibular molar

Of the various root canal morphologies in mandibular molars, the middle mesial root canal is located between the mesiobuccal root canal and the mesiolingual root canal. The middle mesial root canal is a partial or completely independent extra root canal. Because of its fine structure, concealment and even calcification of the root canal orifice, it is difficult to completely clean and fill this root canal and it is easily omitted by dentists. The current study reviewed recent progress in terms of the incidence rate, classification, influencing factors, and exploration and preparation techniques of the middle mesial root canal of the human mandibular molar to provide a reference for clinical diagnoses and treatment.