Jain Dilip, Reddy Smitha, Venigalla Bhuvan Shome, Kamishetty Shekhar
Department of Conservative Dentistry and Endodontics, Sri Sai College of Dental Surgery, Hyderabad, Telangana, India.
J Conserv Dent. 2015 Sep-Oct;18(5):419-22. doi: 10.4103/0972-0707.164060.
Internal anatomy of pulp is complex. The first mandibular molars typically have two roots, one mesial with two root canals and another distal root, which contains one or two canals. A 20-year-old female patient reported with intermittent pain and incomplete root canal treatment in left lower back region since 1-week. Refined access cavity revealed initially two canals in mesial and two canals in the distal root. With operating microscope and cone beam computerized tomography, two additional canals (L-mesio-buccal and B-mesio-lingual) were identified in mesial root. One-year follow-up showed patient was asymptomatic and complete healing of periapical radiolucency.
牙髓的内部解剖结构复杂。第一恒下颌磨牙通常有两个牙根，一个近中根有两个根管，另一个远中根包含一个或两个根管。一名20岁女性患者自述自1周前起左下后牙区出现间歇性疼痛且根管治疗不完善。完善的开髓洞形最初显示近中根有两个根管，远中根有两个根管。借助手术显微镜和锥形束计算机断层扫描，在近中根发现了另外两个根管（近中颊侧L根管和近中舌侧B根管）。1年的随访显示患者无症状，根尖周透射区完全愈合。
