不同光源对全瓷修复材料半透明性变化影响的实验研究

The influence of three illuminations on the translucency of dental porcelain

目的:研究三种常用照明光源(标准A光源,标准D65光源及F2光源)对牙科美容修复材料半透明性变化的影响。方法:选择三种临床常用牙科陶瓷IPS-Empress,In-Ceram,Cergogold采用老化处理方法之后在标准D65光源,标准A光源,及F2光源照射条件下测试其L*,a*,b*值,并计算出透明参数,比较在不同光源照射下半透明性的变化情况。结果:不同光源对材料的半透明性产生影响。标准A光源及F2光源照射下,材料的半透明性高于标准D65光源照射。且无论是否经过老化处理,在标准A光源及F2光源照射时,试件半透明性均高于在标准D65光源照射时所得值。结论:不同全瓷材料在三种常用照明光源照射下其半透明性有所不同,同时经老化处理后的全瓷试件再经不同光源照射,其半透明性改变的程度并不同步。

Objective：To evaluate the influence of three illuminations on the translucency of dental porcelain and resin cements.Method：TP of three shades of dental porcelain were measured before and after thermocycling for 5000 cycles relative to the CIE standard illuminations D65,A and F2 over white and black backgrounds.Result：Thermocycling influenced the TP values,and the illuminant influenced the TP values（P 0.05）.Thermocycling influenced the ΔTP values caused by the change of illuminant and translucency under illuminant A and F2 was higher than under illuminant D65.Conclusion：Difference in translucency by illumination should be considered when shade matching.