前牙冠修复体色差容忍度的初步研究

A primary study of color tolerance of anterior tooth crown prosthesis

目的通过研究前牙陶瓷冠修复体的色差容忍度,为提高修复成功率提供有效配色方案。方法选取30名口腔修复科临床患者的单侧上颌中切牙缺损的冠修复体与对侧天然上颌中切牙为实验对象,使用数码相机在标准环境下分别采集单侧天然牙、修复体与天然牙的数码图像,在对图像进行色彩校正后,利用Photoshop识色软件进行色度分析。根据患者和医师对修复体颜色的满意度将修复体分成满意组和不满意组,对2组的色差数据进行Wilcoxon检验。结果颜色满意组修复体与天然牙的总色差△E为2.5503,颜色不满意组修复体与天然牙的总色差△E为4.0772,2组总色差的差异具有统计学意义(P<0.01)。当修复体明度L*、b*、饱和度C*大于天然牙时,颜色满意组与颜色不满意组间△L*、△b*、△C*的差异无统计学意义(P>0.05);当修复体明度L*、b*、饱和度C*小于天然牙时,颜色满意组与颜色不满意组间△L*、△b*、△C*的差异有统计学意义(P<0.01)。颜色满意组与颜色不满意组间色度差△a*和色相差△H°间的差异均有统计学意义(P<0.05,P<0.01)。结论控制口腔修复体与天然牙间的色差,是配色成功的关键因素;充分利用口腔修复体色差容忍度,将在一定程度上有利于提高修复体的成功率。

Objective To study the color tolerance of anterior ceramic crown and seek an effective approach for color-matching of oral prostheses. Methods 30 single maxillary incisor ceramic prostheses and the corresponding nature teeth were measured by a digital camera in a steady environment for image taking and color measurement, which based on the standard recommended by CIE. The color tolerance was analyzed in two groups based on satisfaction and dissatisfaction of prostheses color-matching. Results The AE of satisfaction group was 2.550 3, while the △E of dissatisfaction group was 4.077 2. There was significant difference between chromatic aberration of satisfaction group and dissatisfaction group （P〈0.01）. When the lightness and saturation of prosthesis were higher than nature teeth, there was no significant difference between △L＊、△b＊、△C＊ of satisfaction group and dissatisfaction group（P〉0.05）. When the lightness and saturation of prosthesis were smaller than nature teeth, there was significant difference between △L＊、 △b＊、△C＊ of satisfaction group and dissatisfaction group（P〈0.01）. There was significant difference between △a＊,△H° of satisfaction group and dissatisfaction group （P〈0.05, P〈0.01）. Conclusion Control of color difference is the key for shade matching of anterior tooth prosthesis. Applying the color tolerance is beneficial to improving the prosthesis quality.