核瓷和体瓷厚度对IPS e.max全瓷修复体颜色的影响

Effect of core and dentin porcelain thicknesses on the color parameters of IPS e.max all-ceramic restoration

目的:研究核瓷与体瓷的瓷层厚度对IPS e.max全瓷修复体颜色的影响。方法:制作不同核瓷与体瓷厚度的IPS e.max圆盘形试件,按核瓷厚度(mm)将试件分为0.8、1.0、1.5 3大组。用ShadeEye NCC比色仪测量各试件的颜色参数,并计算各核瓷厚度组内堆塑不同厚度体瓷后试件之间的色差(△E)。结果:L*值随瓷层的总厚度增加而降低,a*值和b*值随总厚度增加而增加。体瓷厚度变化对L*、a*、b*值均有显著影响(P<0.001);核瓷厚度变化对L*、b*值有显著影响(P<0.001);核瓷与体瓷的相互作用对L*值有显著影响(P<0.001)。0.8 mm核瓷组内各试件之间的△E全部大于2.0;1.0 mm核瓷组内堆塑0.2 mm体瓷与1.0 mm体瓷试件之间的△E大于2.0;其余试件之间△E均小于2.0。结论:IPS e.max核瓷与体瓷厚度以及这2个瓷层的相互作用均能对颜色参数产生显著影响;修复体的核瓷厚度越大,堆塑体瓷后不同部位的颜色差异越小。

Objective：To study the effects of different thicknesses of core and dentin porcelain on the color parameters of IPS e.max all-ceramic restoration.Methods：IPS e.max ceramic disk specimens with different core/dentin thickness were made.Based on the core porcelain thickness（mm）,the samples were divided into three groups：0.8,1.0,and 1.5 mm.Color parameters of the samples were measured with ShadeEye Ncc,the color difference（△E） of samples built up with different thickness dentin porcelain in each core thickness group was calculated.Results：Increase of total disk thickness of core and dentin porcelain resulted in decrease of L＊ and increase of a＊ and b＊.The dentin porcelian thickness exhibited significant influence on the mean values of L＊,a＊ and b＊（P0.001）;the core porcelain thickness exhibited significant influence on the values of L＊ and b＊（P0.001）;the interaction of core and dentin porcelain showed significant influence on the values of L＊（P0.001）.△E of the samples in 0.8 mm core thickness group were all greater than that in 2.0.In 1.0 mm core thickness group the samples with 0.2 mm and 1.0 mm dentin porcelain △E was over 2.0,while the △E of other samples were all less than 2.0.Conclusion：The color parameters of IPS e.max all-ceramic restoration can be varied by core thickness,dentin thickness and their interaction.△E values is minor with different dentin thicknesses when core porcelain is thicker.