Tooth Attrition of Normal and TMD Subjects

关节磨损被认为是异常功能性磨损和磨牙症的最明显体征。当它们频繁发生时，诸如磨牙症和紧咬的行为可能有助于颞下颌关节紊乱病的产生。本研究的目的是评估80名正常人和40名磨牙症受试者的牙齿磨损模型。使用Murphy方法的个体牙齿评分进行了比较。Murphy方法涉及将每个牙齿的磨损面模式与一组标准的牙齿磨损模式（前牙为0至6级，后牙为0至8级）进行匹配。另一种方法用于将个体牙齿磨损评分减少到代表每个模型的单个评分。首先提取临床咬合面，然后提取牙齿磨损区域。然后用NIH Image图形软件测量这些面积。并与正常人和磨牙症患者进行比较。在正常人的结果中，Murphy评分的总和随着年龄的增长而增加。磨牙症患者的临床咬合面和小关节面积的关系是正常人的2倍。在下额牙是1.5倍。

Attrition is considered the most visible sign of abnormal functional wear and of bruxism. When they occur frequently behaviors such as bruxism and clenching may contribute to the production of temporomandibular joint disorders. The purpose of this study was to evaluate the tooth attrition of the eighty Normal and forty Bruxism subjects on dental casts. The individual tooth scores using the Murphy method were compared. The Murphy method involved matching each tooth's wear facet pattern against a standard set of tooth wear patterns (0 to 6 scale for anterior teeth and 0 to 8 scale for posterior teeth). The other method was used to reduce the individual tooth attrition scores to a single score representing each cast. First the clinical occlusal surface was extracted and second, tooth wear area was extracted. And then measured these areas with NIH Image graphic software. All of the data was compared with normal subjects and bruxism subjects. In the results of the normal subjects, the total of the Murphy score increased with subject's age. The relationship with the clinical occlusal surface and facet areas in the bruxism subjects was two times large at the upper frontal teeth compared with normal subjects. At the lower frontal teeth was 1.5 times.