Thayer T A
University of Nebraska Medical Center, College of Dentistry, Department of Orthodontics, Lincoln.
Am J Orthod Dentofacial Orthop. 1990 May;97(5):422-6. doi: 10.1016/0889-5406(90)70114-R.
Lateral cephalometric radiographs of 35 males between the ages of 11 years and 24 years, all of whom had Class II, Division 1 malocclusions, were traced and Wits appraisals were completed with the use of two occlusal planes: the functional occlusal plane and the bisected occlusal plane. These two values were then statistically related to two dental parameters (overjet and incisor angulation [1 to 1]) and one skeletal parameter (angle ANB) by means of the Pearson product-moment correlation with a predetermined level of statistical significance at p less than 0.05. The findings demonstrated that Wits values for both occlusal planes were significantly correlated to both skeletal and dental parameters. Each Wits value also shared variance with the Wits value for the other occlusal plane. Both Wits measures seem to vary to the same degree when compared to the other measures, as demonstrated by the r values. From the results of this experiment, three conclusions can be drawn: (1) either occlusal plane can be used in the calculation of the Wits appraisal to aid in the diagnosis of the severity or degree of anteroposterior jaw disharmony, (2) the bisected occlusal plane Wits appraisal value showed a higher relationship to dental measures than the functional occlusal plane Wits appraisal value, and (3) the functional occlusal plane Wits value shared slightly more variance with skeletal measures.
对35名年龄在11岁至24岁之间的男性进行了头颅侧位X线片检查，这些男性均为安氏II类1分类错牙合畸形。通过使用两个咬合平面（功能性咬合平面和等分咬合平面）进行描迹并完成Wits评估。然后，通过Pearson积差相关分析，将这两个值与两个牙齿参数（覆盖和切牙角度[1:1]）和一个骨骼参数（ANB角）进行统计学关联，设定统计学显著性水平为p<0.05。结果表明，两个咬合平面的Wits值与骨骼和牙齿参数均显著相关。每个Wits值也与另一个咬合平面的Wits值共享方差。如r值所示，与其他测量值相比，两种Wits测量值的变化程度似乎相同。从本实验结果可以得出三个结论：（1）在计算Wits评估时，任一咬合平面均可用于辅助诊断前后颌不协调的严重程度或程度；（2）等分咬合平面的Wits评估值与牙齿测量值的相关性高于功能性咬合平面的Wits评估值；（3）功能性咬合平面的Wits值与骨骼测量值共享的方差略多。
