同品牌体瓷梯度匹配颜色的研究

目的 本课题旨对牙用体瓷材料颜色变化和匹配规律作一定程度的定量研究；为临床配色工作提供理论依据。方法 利用最新的颜色分光光度计对同品牌体瓷梯度配色进行一定程度的定量研究。结果 对于同品牌体瓷，A系列色号进行梯度匹配，其色度变化为非线性的曲线关系，大编号颜色的份量的增加，其a＊、b＊有一定程度的增加，但其增加程度不成比例。结论 高明度的陶瓷材料中加入少量的低明度的陶瓷材料对颜色的总体影响较大，其影响主要表现在明度的变化上；低明度的陶瓷材料中加入少量的高明度材料对颜色的总体影响不大．其对颜色的总体影响主要存在于a＊、b＊值的变化上，即样本色调的变化上。

Color matching test for gradient color samples from body porcelain of same color series

Objective To quantitatively test the color variation and matching in body porcelain of same color series and provide clinical guidance for shade selection.Methods Gradient color samples of color series A were made with different proportions of A1 and A3 body porcelain.The reflecting spectrum and color parameters of these samples were quantitatively measured by spectrophotometer.Results There was a non-linear change in chroma for these gradient color samples.An obvious brightness change was found when a little amount of lower brightness material was added into higher brightness material.On the contrary,when a little amount of higher brightness material was added into lower brightness material,no obvious brightness change was found and the change was just in the value of a,b,which mainly reflected the change of chromaticity.Conclusion The color variation after proportional mixing of body porcelain of same color series,is irregular and the final outcome of the mixed color can't be determined simply with their proportions in the mixture.