Holtzmann L
Int Endod J. 1997 Nov;30(6):422-3. doi: 10.1046/j.1365-2591.1997.00106.x.
The dynamic concept of the root canal system, describing a variable morphology of multiple root canals inter-connected by anastomoses, has been established as the prevailing state in mandibular molars. This case report presents the treatment of a mandibular first molar with five root canals, of which three were located in the mesial root. A third middle root canal was found between the mesiobuccal and mesiolingual root canals. The morphological pattern of separate apical terminations of the three mesial root canals, as manifested in this case, is a very rare one and seldom encountered.
根管系统的动态概念，描述了通过吻合相互连接的多个根管的可变形态，已被确立为下颌磨牙的普遍状态。本病例报告展示了一例下颌第一磨牙有五条根管的治疗情况，其中三条位于近中根。在近中颊侧根管和近中舌侧根管之间发现了第三条中间根管。本病例中所表现出的三个近中根管各自根尖端独立的形态模式非常罕见，很少遇到。
