Tooth Attrition of Normal and TMD Subjects

磨损被认为是异常功能磨损和磨牙症最明显的迹象。当它们频繁发生时，如磨牙和咬牙等行为可能有助于产生颞下颌关节紊乱。本研究的目的是评估80名正常和40名磨牙患者在牙模上的牙齿磨损情况。比较采用墨菲法的单个牙齿评分。墨菲方法将每颗牙齿的磨损面模式与一套标准的牙齿磨损模式（前牙为0到6级，后牙为0到8级）进行匹配。另一种方法是将单个牙齿磨损分数降低到代表每个铸型的单个分数。首先拔除临床咬合面，然后拔除牙齿磨损区。然后用NIH图像软件测量这些区域。所有数据均与正常受试者和磨牙症受试者进行比较。在正常被试的结果中，墨菲分数的总和随着被试年龄的增长而增加。磨牙患者上额牙与临床咬合面和牙突面积的关系是正常人的2倍。下门牙是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.