颅底重叠法Wits值的评价

目的 探讨颅底重叠法测量Ｅｉｔｓ值与常规Ｗｔｉｓ值测量法对评价治疗前后颌骨矢状关系改变的可靠性。方法 样本为４８例经过正畸治疗的错卧倒患者的头颅侧位片，用计算机数字化仪测量法分别测量常规Ｗｉｔｓ值、颅底重叠法Ｗｉｔｓ值及ＡＮＢ角在治疗前后的变化，用ＳＡＳ软件包对３者间的相关笥进行统计分析。结果 重叠法Ｗｉｔｓ值与ＡＮＢ角之间的相关笥明显高于常规Ｗｉｔｓ值，相关系数高达０．８４９，差异具有高度显著性

Evaluation of Wits appraisal with superimposition method

Objective To compare the conventional Wits appraisal with superimposed Wits appraisal in evaluation of sagittal jaw relationship change between pre and post orthodontic treatment. Methods The sample consists of 48 case pre and post treatment lateral head films. Computerized digitizing is used to get the cephalometric landmarks and measure conventional Wits value, superimposed Wits value and ANB angle. The correlation analysis among these three measures was done by SAS statistical package. Results The change of ANB angle has higher correlation with the change of superimposed Wits than that of the conventional Wits. The r value is as high as 0.849 ( P <0.001). Conclusion The superimposed Wits appraisal reflects the change of sagittal jaw relationship more objectively than the conventional one.