渗透树脂治疗正畸后牙面白垩斑的一年疗效观察

Efficacy of one year treatment of icon infiltration resin on post-orthodontic white spots

目的:评价渗透树脂对正畸后牙面脱矿(白垩斑)的治疗效果及颜色稳定性。方法:对正畸治疗后6颗上颌前牙均出现脱矿的患者8名(患牙共48颗)进行渗透树脂治疗。术前、术后即刻、术后1周、6个月和12个月分别在同等条件下拍摄照片。效果分为3级:有效、部分有效和无效。部分有效的患牙测量术前、术后白垩斑(whitespot,W)及患牙唇面的面积(tooth,T),计算出W/T比值(%),统计方法采用两个样本的非参数Wilcoxon秩和检验;数码照片以JPG格式导入Photoshop图像分析软件,转化为8位灰度文件,以柱状图的形式显示被治疗区域牙面的灰度值,对比不同时间点牙面颜色的变化情况,采用非参数Wilcoxon秩和检验。结果:有效患牙11颗(22.9%,11/48),部分有效37颗(77.1%,37/48),无效0颗。部分有效的患牙术前W/T(%)平均值是31.37%,术后下降为7.99%,P<0.05。术前白垩斑区域灰度平均值是188.07±5.62,术后1周灰度值是143.20±7.03,经Wilcoxon秩和检验,P<0.05;术后6个月和12个月灰度值分别是136.33±4.54和139.57±3.70,分别与术后1周相比,P>0.05。结论:渗透树脂能明显改善正畸治疗后白垩斑患牙的美观,渗透治疗后的牙面颜色在1年观察期内表现稳定。

Objective ： To clinically evaluate the effectiveness of icon infiltration resin on masking post- orthodontic white spots. Methods： Eight post-orthodontic patients with 6 maxillary anterior teeth showing signs of decalcification （ total 48 teeth） were enrolled in this study. All teeth were treated with icon resin infiltration according to manufacturer＇ s recommendation. Standardized digital photographs were taken be- fore, immediately after and 1 week, 6 and 12 months after treatment. Before taking pictures the assigned teeth were cleaned using pumice and rubber polishing cups. The results were classified into three groups： completely masked, partially masked, and unchanged. Pictures of partially masked teeth were analyzed using image analysis software （ Image-pro plus 6.0）, size of the white spot lesion （W） and the whole tooth facial surface （T） were measured, then W/T ratio （in % ） was calculated. The images were impor- ted into image analysis software （Photoshop） which presented the images into histograms of gray scale from （0 to 255 ）. Results： Among the 48 teeth, ly masked, whereas 37 teeth （77. 1% , 37/48 changed. For partially masked teeth, W/T ratio 11 teeth （22.9% , 11/48） were classified as complete- ） were classified as partially masked and no tooth un- decreased significantly after treatment from 31.37 % to 7.99% （by Wilcoxon＇s signed rank test, P 〈 0.05 ）. The means at gray scale for the initial and 1 week photographs after treatment were 188.07±5.62 and 143.20±7.03 respectively, and there was signifi- cant difference by Wilcoxon＇s signed rank test （P 〈 0.05 ）. The data of 6 and 12 months after treatment were 136.33±4.54 and 139.57±3.70 respectively, there were no significant differences （P 〉0.05） in comparison to 1 week after treatment. Conclusion： Resin infiltration was proven to be an effective treatment for masking white spot lesions. The surface color of infiltrated lesions remained stable after 12 mnnths.