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普通牙髓学教科书里有关恒牙的牙根、根管形态多是根据白种人的资料而描述的。牙冠形态的种族差异已有详述,牙根和根管的种族差异却没有系统的研究,本研究的目的是确定中国人种下颌第二磨牙的牙根融合频率及根管形态。材料和方法研究所用100颗离体牙是按随机原则选定的,这些牙齿均有确凿证据保证是中国人的。每个牙齿在石英卤素光源下用放大镜观察牙根融合情况,一个牙根如果和另一牙根相融合超过其根长的一半就被视为融合根。每个离体牙齿用专门设计的固位装置,从不同的角度拍两张以上的X线片,用放大镜观察记录根
Ordinary endodontics textbooks on the root of permanent teeth, root canal morphology is mostly based on Caucasian data described. Racial morphology of the racial differences have been described in detail, there is no systematic study of racial and root canal racial differences. The purpose of this study was to determine the frequency of root fusion and root canal morphology in the Chinese mandibular second molar. Materials and methods used in the study of 100 isolated teeth are selected on a random basis, these teeth have conclusive evidence to ensure that the Chinese. Each tooth was observed with a magnifying glass under a quartz halogen light source for root fusion. A root that is fused to another root more than half its root length is considered a fusion root. Each tooth with a specially designed retention device, from different angles to take more than two X-ray film, with a magnifying glass to observe the root record