Mickel Andre K, Chogle Sami, Bingham Robert, Self McKinley, Bogle John
Case School of Dental Medicine, Cleveland, Ohio, USA.
Gen Dent. 2007 May-Jun;55(3):221-3.
Many parameters must be addressed for endodontic therapy to succeed. Because conservation of tooth structure is vital, the pulp chamber and root canal orifices should be located by using a method that is consistent yet accurate. The correlation of occlusal anatomy with the locations of the root canal orifice may aid dentists with access design. This study sought to determine if a correlation existed between occlusal surface anatomy, pulp chamber location, and root canal orifice location. This in vitro study utilized 21 human mandibular first molars. For each specimen, amalgam restorations were placed in the respective cusp tips, with gutta-percha placed in each canal at the level of the furcation. The authors made digital radiographs and occlusal photographs of each complete specimen. The samples were sectioned horizontally at the level of the cementoenamel junction (CEJ). Using a digital software program, the radiographs were superimposed with the digital photographs and correlations of pulp chamber to locate the canal orifice and occlusal surface anatomy. The authors found that the pulp chamber of the mandibular first molar lies more lingual at the level of the CEJ. In addition, the orifices were consistent in their location relative to cusp tip anatomy, a discovery that may assist dentists with the access design.
为使根管治疗取得成功，必须考虑许多参数。由于保存牙体结构至关重要，牙髓腔和根管口的定位应采用既一致又准确的方法。咬合面解剖结构与根管口位置之间的相关性可能有助于牙医进行开髓设计。本研究旨在确定咬合面解剖结构、牙髓腔位置和根管口位置之间是否存在相关性。这项体外研究使用了21颗人类下颌第一磨牙。对于每个标本，在相应的牙尖放置银汞合金修复体，在根分叉水平的每个根管中放置牙胶。作者对每个完整的标本拍摄了数字化X线片和咬合面照片。样本在牙骨质釉质界（CEJ）水平进行水平切片。使用数字软件程序，将X线片与数字照片叠加，并对牙髓腔进行相关性分析，以确定根管口和咬合面解剖结构。作者发现，下颌第一磨牙的牙髓腔在CEJ水平处更偏向舌侧。此外，根管口相对于牙尖解剖结构的位置是一致的，这一发现可能有助于牙医进行开髓设计。
