VITA Easyshade电脑比色仪的比色性能研究

The performance of VITA Easyshade compact

目的:研究分析VITA Easyshade电脑比色仪的比色性能。方法:选取40名志愿者的右上中切牙进行比色,2名视觉比色者(A和B)和2名VITA Easyshade电脑比色仪比色者(C和D),比较两种方法比色结果的一致性;2周后,4名比色者进行重复比色,比较同一比色方法不同时间的可重复性。选取40颗离体牙作为研究对象,在标准环境的暗箱中进行拍照,并用Adobe Photoshop CS3软件处理,得到离体牙在Lch表色系统中近似标准的色彩值;比较两种比色方法色彩值结果的差异性和准确性。结果:A和B两者之间的一致性为67.5%,C和D两者之间为92.5%,两种比色方法的一致性差异有统计学意义(P<0.05)。A、B、C、D四者的可重复性分别为70.0%、65.0%、87.5%、90.0%。对两种方法离体牙比色的色彩值对比分析,明度(L)、red(a~*)、yellow(b~*)、彩度(C)、色相(H)和总色差(ΔE)差值的差异均有统计学(P<0.05)。结论:VITA Easyshade电脑比色仪的一致性、可重复性及准确性均较视觉比色高,更能客观地反映牙齿的色彩,可用于辅助临床比色。

Objective： To exam the performance of VITA Easyshade compact and provide a reference for clinical,and do some comparative studies on VITA Easyshade computer-aided and visual shade matching. Methods： The maxillary right central incisors from 40 volunteers were measured,two doctors（ A and B） using visual shade matching and the other two doctors（ C and D） using VITA Easyshade Computer-aided shade matching,that two weeks later by using the same method and recording the results. Forty vitro premolars were measured,taking these pictures at approximately standard environment in a self-made standard light black box,and treated with Photoshop,get the color parameters. The difference of color parameter were compared,the accuracy of two methods were analysed. Results： The consistency of A and B reached 67. 5%,C and D reached 92. 5%,and The repeatability of A,B,C and D was 70. 0%,65. 0%,87. 5% and 90. 0% respectively. There were statistically significant difference in the color parameters of the Luminosity（ L）,red（ a~＊）,yellow（ b~＊）,chroma（ C）,hue（ H）and color difference（ ΔE） between two methods,respectively. Conclusion： Compared with visual shade matching,VITA Easyshade showed better consistency,repeatability and accuracy that can be used in clinical auxiliary.