使用双侧闪光灯摄影比色技术对上颌中切牙进行比色的可行性研究

摘要

Objective:To study the feasibility of bilaterla flashlight imaging technique for color comparison of maxillary central incisors and to understand the color difference between left and right maxillary central incisors in young people.Methods:Digital photographs of the maxillary central incisors of 155 volunteers were taken by digital camera and bilateral flash.Computer software was used to measure the L * (lightness),a * (red-green) and b * (yellow-blue) color coordinates of each tooth in a photograph.The intra-class correlation coefficient (ICC) of reliability was used to compare the color coordinates between the two images of each right maxillary central incisor to test the consistency of this technique.Paired sample t test was used for statistical analysis of L *,a * and b * values of left and right maxillary central incisors,so as to compare the color differences of left and right maxillary central incisors.Results:The ICC test values of L *,a * and b * were within an excellent reliability range (0.75-1.00).The a * coordinate (red-green chromaticity) of left and right maxillary central incisors was significantly different in the incisal region,middle region and cervical region,and the L * coordinate (brightness) was significantly different only in the incisal region of the maxillary central incisors on both sides,and the b * coordinate (yellow-blue chromaticity) was significantly different only in the cervical region of the maxillary central incisors on both sides.Conclusion:Using the bilateral flashlight imaging technique produces a consistent results in the process of tooth color measurement.In young people,the color of the upper central incisors is not the same on both sides.%目的:研究使用数码相机双侧闪光灯摄影比色技术对上颌中切牙进行比色的可行性,并了解青年人上颌左右中切牙的颜色差异.方法:采用数码相机和双侧闪光灯获取155例志愿者的两侧上颌中切牙的数码照片.利用计算机软件对每颗牙齿照片的的L*(明度)、a*(红绿色度)和b*(黄蓝色度)的颜色坐标进行测量.采用可靠性内相关系数(ICC)比较每颗右上颌中切牙两次拍照之间的色彩差异,检验该技术的一致性.采用配对样本t检验对左右上颌中切牙的L*、a*、b*值分别进行统计学分析,比较左右上颌中切牙的颜色差异.结果:L*、a*、b*的ICC检验值均在良好的可信度范围内(0.75～1.00).左右两侧上颌中切牙的红绿色度a*在切端、中部和颈部均有明显差异,明度L*仅在两侧上颌中切牙的切端具有明显差异,黄蓝色度b*仅在两侧上颌中切牙的牙颈部有明显差异.结论:使用双侧闪光灯摄影比色技术在牙齿比色过程中可以输出稳定的结果,具有较高的可信度;青年人左右两侧上颌中切牙的颜色并不是完全相同的.