全瓷材料的透明度及不同背景下色度学变化的实验研究

摘要

Objective To evaluate the aesthetic outcomes of all-ceramic restorations by using four different porcelain materials on mimic-tetracycline pigmentation backgrounds. Methods The translucency parameters (TP) of four different all-ceramic restorations (IPS e.max, Cercon, Lava, and Girrbach) were measured under white and black back grounds by using Datacolor 600, and the TP of each group (n=8) was calculated. Five different mimic-tetracycline pigmentation teeth were printed with different colors by using a colorized printer as the prepared teeth backgrounds, under which the color para-meters of each group were measured. The color differences with a standard 2M2 sample were calculated. Results The TP values of the all-ceramic restorations were 15.67±0.58 for IPS e.max, 9.73±0.43 for Girrbach, 9.55±0.25 for Lava, and 7.56± 0.43 for Cercon. The TP value of the IPS e.max group was significantly higher than those of the other three groups (P<0.001). TheΔE of the IPS e.max group was 1.33 national bureau of standards (NBS) on the yellow background, and theΔE of the Lava and Girrbach groups were 0.75 NBS to 1.47 NBS on the mimic-tetracycline pigmentation backgrounds of gray, dark gray, dark red, and light red. Conclusion The IPS e.max group has favorable TP. IPS e.max shows better aesthetic effects than the others when restoring mimic-tetracycline pigmentation teeth (on yellow background). Lava and Girrbach show better aesthetic effects on mimic-tetracycline pigmentation teeth (on gray, dark gray, dark red, and light red backgrounds).%目的：比较4种全瓷材料修复体的透明度参数（TP）及其在模拟不同颜色的四环素染色牙背景下的色差ΔE，评价其美学修复效果。方法制作4种不同全瓷材料（包括IPS e. max、Cercon、Lava、Girrbach）的修复体样本（n=8），用Datacolor 600型分光测色仪测得每组样本在白色及黑色背景下的颜色参数，计算TP。用彩色打印机打印出黄、灰、深灰、暗红和亮红色5组颜色以模拟四环素染色基牙，并以此为背景，测得每组样本与2M2色瓷片的色差ΔE。结果 IPS e. max、Cercon、Lava、Girrbach组样本的TP值分别为15.67±0.58、7.56±0.43、9.55±0.25、9.73±0.43；IPS e. max组的TP值明显大于其他3组（P<0.001）。IPS e. max组在黄色背景下的ΔE为1.33 NBS；Lava组和Girrbach组在灰、深灰、暗红和亮红色背景下的ΔE值在0.75~1.47 NBS之间。结论 IPS e. max组具有良好的透明度；在修复偏黄四环素染色牙时，IPS e. max的美学效果较好；而在修复灰、深灰、暗红和亮红色四环素染色牙时，Lava和Girrbach的美学效果较好。