IPS Empress 全瓷贴面颜色效果的初步研究

目的 评价IPS Empress全瓷贴面的遮色性能及其颜色的匹配性和稳定性。方法 18例患者采用IPS Empress全瓷材料制作贴面86个，分为四环素牙(A组)和非四环素牙(B组)2组进行观察，分别以所选比色板和相邻正常天然牙(C组)为对照。用ShadeEyeNCC电脑比色仪分别测量贴面修复前、后牙齿L^*a^*b^*值；以粘结后为基点，分别在0．5年、1年、2年后测量贴面的L^*a^*b^*值。用SPSS10．0软件分析修复前、后牙齿颜色的变化情况，贴面颜色与天然牙颜色的匹配性及修复后贴面颜色的稳定性。结果 贴面修复前、后，A、B2组牙齿颜色L^*a^*b^*值的差异均有显著性，色差值分别为5．01和4．15。A组贴面颜色与所选比色板的色差值为2．45；与基点相比，在修复2年后贴面的明度值有显著降低，但色差值的差异无显著性。B组贴面颜色与相邻天然牙的色差值为0．22，修复后贴面颜色无显著改变。结论 IPS Empress全瓷贴面对非四环素牙具有良好的遮色效果及颜色匹配性、稳定性；对四环素牙有一定的遮色能力，但其颜色与比色板不能完全匹配，修复后明度值有所降低，对其颜色效果尚需进一步观察。

A preliminary study on the color effect of IPS Empress all-ceramic veneers

OBJECTIVE: To evaluate the opaquing capacity, color compatibility and stability of IPS Empress all-ceramic veneers. METHODS: A total of 86 IPS Empress all-ceramic veneers were made for 18 patients. The patients were divided into three groups: Group A was tetracycline teeth, 64 veneers for 5 patients; Group B was non-tetracycline teeth, 22 veneers for 13 patients; Group C was 22 natural vital teeth with normal color as control group. Before and after veneers were inserted, ShadeEye NCC was employed to obtain L * a * b * values of each tooth. The values of cemented veneers used as the baseline, the L * a * b * values of each veneer were measured half a year, 1 year, and 2 years after restoration respectively. All L * a * b * values at different evaluation times were analyzed by SPSS 10.0. RESULTS: Before and after veneers were restored, the L * a * b * values of both Group A and Group B were significantly different, the color difference being 5.01 and 4.15 respectively. The color difference between Group A and selected shade guides was 2.45. Compared with the baseline value, the L * value of Group A significantly decreased 2 years after restoration, but the DeltaE of different evaluation times was not significantly different. The color difference between Group B and Group C was 0.22 and there was no significant color difference after restoration. CONCLUSIONS: IPS Empress all-ceramic veneers have excellent opaquing capacity, color compatibility and stability to non-tetracycline teeth. To tetracycline teeth IPS Empress all-ceramic veneers have a certain opaquing capacity, but they cannot completely match with shade guides; the L * value is significantly different after restoration and further studies are needed to evaluate its color effect.