3种树脂覆盖齿科合金对全瓷冠修复的遮色效果

The opaqueeffect of 3 resins covering dental alloys in the all-ceramic treatment

目的:观察3种树脂,不同层厚下对齿科合金的遮色效果,及对全瓷冠颜色的影响。方法:2种成核树脂和1种通用树脂制作厚度为1.0mm和2.0mm的试样,制作贵、贱合金片模拟金属桩核材料,制作In-Ceram Alumina和EmpressII 2种全瓷材料试样。以2.0mm厚树脂加全瓷修复的颜色作为参照,采用金属树脂全瓷叠加的方法测量复合体颜色,并计算与参照组的色差。然后依次磨除树脂片,在其厚度为0.8mm、0.6mm、0.4mm、0.2mm以及无树脂层的情况下测量计算色差。结果:当树脂层厚度≥0.6mm时,DMG和ParaPost中试验组与参照组色差<1.0;对于Z100树脂,当树脂层厚度<1.0mm时,色差>1.0。镍铬合金组的色差均高于金合金组(P<0.01),当以金合金作为基底背景时,DMG和ParaPost树脂均能有效遮盖金合金颜色。Z100树脂组的色差大于另外2种树脂色差(P<0.01)。结论:DMG和Para-Post树脂在厚度达到0.6mm时能够有效遮盖底层金属的颜色。全瓷修复如果使用金属核时,建议使用金合金材料。

Objective： The purpose of this study was to evaluate the opaque effect of 3 resins by covering dental alloys and the effects of the shade of all-ceramic materials.Method： Two core build-up materials （DMG and ParaPost） and one universal resin （Z100） were used to make-up disc samples in two thicknesses： 1.0 mm and 2.0 ram. One Au-riched noble alloy and a Ni-Cr alloy were cast in diameter 16.0 mm to stimulate metal core materials. According to the manufacture instrument, a sample of EmpressII and In-Ceram Alumina was fabricated. The shades of 2.0 mm thick resin covered by all ceramic were used as references. And the shades of metal / resin （thickness of 1.0 mm）/ceramic combinations were measured and compared to the references. The shades of combinations were measured with the following thickness of resins： 1.0mm, 0.8 mm, 0.6mm, 0.4mm, 0.2 mm and 0 mm by wearing away using SiC paper.Result： When the thickness of DMG and ParaPost resin was not lower than 0.6 mm, the color difference was not higher than 1.0： Respect to the Z100 resin, the thickness of resin must higher than 0.8 mm to achieve a color difference lower than 1.0. Compare the noble and base alloys, the Au riched-noble alloy do a weaker effect to the combinations shade than Ni-Cr alloy. The shade of EmpressII all-ceramic material will be easy affected by the shade of base layer than In-Ceram Alumina （P〈0.01） .Conclusion： The two core build-up materials （DMG and ParaPost） can mask the shade of dental metal base with a thickness of 0.6 mm. When apply- ing all ceramic material to metal base, the noble alloy was recommended.