具三個近心頰側根管與兩個遠心頰側根管之上顎第一大臼齒：病例報告

Maxillary First Molar with Three Mesiobuccal Canals and Two Distobuccal Canals: A Case Report

了解複雜的牙齒根管形態並且徹底的進行清創與封填是根管治療成功的基本要素。上顎第一大臼齒的根管具有相當程度的複雜性，因此提升了治療的困難度。治療時若發生根管遺漏則會降低根管治療的成功率。本病例報告為一例具有三個近心頰側根管與兩個遠心頰側根管的上顎第一大臼齒，藉由牙科顯微鏡、錐形射束電腦斷層掃描和超音波器械的輔助下進行非手術性根管治療。本文亦針對此類型根管形態進行文獻回顧與討論，分析其盛行率與形態分佈，有助於臨床牙醫師更一步的了解此複雜的根管系統。

A comprehensive understanding of complex root canal morphology and complete cleaning, shaping and obturation of the root canal system, are essential for successful endodontic treatment. Maxillary first molars feature a complex root canal morphology, which increases the complexity of treatment. Missed canals during root canal therapy can result in a lower success rate of endodontic treatment. This study reports a case of a maxillary right first molar that presented three root canals in the mesiobuccal root and two root canals in the distobuccal root. Non-surgical root canal treatment of the case, with the aid of a dental operating microscope (DOM), ultrasonic instruments, and cone beam computed tomography (CBCT) were described. This article also proposed a comprehensive review to provide a broader description of the canal configurations and their prevalence for the root canal system of the maxillary first molar, attempting to clarify the variations of the root canal system for clinicians.