Research progress of mandibular first molar preparation with nickel-titanium instruments under the guidance of CBCT

: Endodontic disease or periapical disease is one of the most common oral diseases in clinic. Root canal therapy (RCT) is currently the most common and effective method for the treatment of endodontic or periapical diseases. Root canal therapy (RCT) is currently the most common and effective method for the treatment of endodontic or periapical diseases. The complex root canal morphology of mandibular first molar is a major challenge for its root canal treatment. The application of nickel-titanium instruments has brought new breakthroughs in root canal therapy, but also brought some new hidden dangers. This article reviews the research status of cone beam computed tomography (CBCT) guided nickel-titanium instruments for mandibular first molar preparation in recent years.