3种品牌复合树脂体外电子比色色差分析

Electronic color difference analysis of 3 kinds of composite resins in vitro

目的为电子比色仪应用于复合树脂直接粘接修复材料选色提供依据。方法选择3个品牌(Ceram X、Tetric、Majesty)共23种色号的复合树脂,制备成厚度分别为1、2、3 mm的梯形树脂样本,将每个样本分别在黑、白两种背景下使用Crystal Eye分光光度比色仪进行比色,获取每个样本的CIE L*、a*和b*值,并与系统所给出的在Vita Classical比色系统下最接近的色号进行色差分析,获得色差值ΔE。以Vita Classical作为内置比色系统,分析品牌、背景、厚度因素对三种品牌树脂比色结果匹配率的影响。结果 3种品牌树脂的比色结果均受到比色背景和样本厚度的影响。比色时样本背面的黑、白背景对Tetric树脂和Majesty树脂的比色结果匹配率有影响,在黑背景下的比色结果匹配率明显高于在白背景下的比色结果匹配率(P<0.001),而对Ceram树脂的比色结果的匹配率没有影响(P>0.05)。样本的厚度对Tetric树脂和Majesty树脂比色结果匹配率有影响(P<0.05),随着厚度的增加,比色结果的匹配率有升高的趋势;而对Ceram树脂的比色结果匹配率无影响(P>0.05)。结论使用Crystal Eye分光光度比色仪对树脂比色时,黑、白两种背景和样本厚度因素均会对比色结果的匹配率产生影响,在黑背景下的比色结果匹配率明显高于在白背景下的比色结果匹配率,随着厚度的增加比色结果的匹配率有升高的趋势,影响的程度因为树脂的不同而有不同。

Objective To provide the basis for the application of electronic colorimeter into shade selection in composite resin adhesive restorations. Methods Three light-curing resin composites,a total of 23 shades,were investigated. Trapezoidal specimens of 1 mm,2 mm and 3 mm in thickness of each shade of resin composites were prepared,5 for each kind of thickness. Color was measured by Crystal Eye spectrophotometric colorimeter against white and black backgrounds. CIE L＊,a＊,b＊ values relative to CIE source were obtained,and color difference was analyzed under the Vita classical built shade guide. The system gave the most recommended shade and color difference ΔE was obtained. With Vita classical shade guides as a built-in,the factors of brand,background and the thickness of the resins affecting the match rate of the results of shade matching were analyzed. Results Background influenced the match rates of the results of shade matching to Tetric and Majesty,while not to Ceram X（P 〉0. 05）. The match rate of the results of shade matching over a black background was much higher than that over a white background（P〈0.001）.Thickness of the resins influenced the match rates of the results of shade matching to Tetric and Majesty（P〈0.05）,while not to Ceram X（P〉0.05）. As the thickness increased,the match rates of the results of shade matching showed a tendency to increase. Conclusion When using the CrystalEye spectrophotometer for colorimetric resin,both black and backgrounds and sample thickness factors have an effect on the match rate of the colorimetric results. The matching rate of colorimetric results in black background was significantly higher than the results in white background. As the thickness increases the matching rate of the colorimetric results tends to increase,the extent of the influence varies depending on the resin composites.