【摘要】 目的确定楔状缺损侧影深度指标对实际缺损程度的代表性。方法选取69副牙石膏模型上的193颗上颌患楔状缺损牙齿,游标卡尺测量牙颈部缺损的侧影深度、宽度和高度,计算测量体积;其中9颗牙齿楔状缺损用复合树脂修复,取出修复体称重,换算缺损实际体积。结果以实际体积为Y,测量体积为X,建立线性回归方程:Y=0．4735+2．5948X;确定系数R2=0．9472,回归系数经检验F=125．57,P<0．01。表明该回归方程成立,实际体积与测量体积的相关性好。建立线性回归方程:实际体积(缺损)=0．4735+2．5948X侧影深度×宽度×高度(缺损)／6。楔状缺损侧影深度与实际体积有显著相关关系。结论楔状缺损一维测度可以代表牙颈部缺损程度。更多还原

【Abstract】 Objective To determine the reliability of the tooth wear index in representing the profile of tooth cervical defect. Methods One hundred and ninety-three teeth with wedge-shaped defects were selected in 69 plaster casts. The sizes of every wedge-shaped defect were measured by using vernire caliper and the volumes of those were calculated. Otherwise, by weighting the restoration of defects, the real volumes of the 9 teeth defects were calculated by formulating. Results The formulation for calculatin of the real volume of the defects was presented as: volume = 0.4735 + 2.5948 X (deep of profile X height X broad of defects)/6. The profile of the defect was strongly related to the volume. Conclusions The value of one dimension measure of the wedge-shaped defects may present the tooth wear index.更多还原