计算机辅助设计与辅助制作贴面材料的色度学研究

Optical properties of computer aided design and computer aided manufactured materials for veneer restorations

目的比较不同种类计算机辅助设计与辅助制作(computer aided design and computer aided manufactured,CAD/CAM)贴面材料的透光性及色度参数,以期指导临床实践。方法选择11种可制作贴面的切削成形材料(A2色调):IPS e.max CAD(HT与LT型)、IPS Empress CAD(HT与LT型)、LavaTM Ultimate(HT与LT型)、VITA SUPRINITY(HT与T型)、VITA ENAMIC(HT与T型)、VITABLOCS Mark Ⅱ,设为A、B、C、D、E、F、G、H、I、J、K组。各组材料切削制备为长10.0 mm、宽8.0 mm、厚0.7 mm的片状试样(每组6个)。用砂纸打磨,将试样厚度控制于(0.60±0.03)mm。将各组试样分别置于标准黑、白瓷板及树脂块背景(A2色调)上,使用测色仪测量色度参数,并计算透光度值及其与比色板A2色标的色差(ΔE)。结果单因素方差分析显示11组材料的透光度值差异有统计学意义(F=253.69,P<0.05)。各组试样与A2色标中部的ΔE范围为1.78~4.12(ΔE<5.5)。结论切削成形材料的透光性与材料的透光类型及成分密切相关。本项实验选用的切削成形材料与A2色标有较好的颜色匹配性。

Objective To investigate the translucency parameters (TP) and the color parameters of computer-aided design and computer-aided manufacturing (CAD/CAM) materials for veneer restorations in order to guide clinical practice. Methods Eleven groups of CAD/CAM materials (A2 shade) were included in this study: IPS e.max CAD HT/LT, IPS Empress CAD HT/LT, LavaTM Ultimate HT/LT, VITA SUPRINITY HT/T, VITA ENAMIC HT/T, VITABLOCS Mark Ⅱ, and were named as Group A, B, C, D, E, F, G, H, I, J, K. Each material was designed and milled to disk-shaped specimens (10.0 mm×8.0 mm×0.7 mm)(n=6). The specimens were polished with silicon carbide paper and the thickness of specimens were adjusted into (0.60±0.03) mm. The color parameters of specimens were individually measured with the colorimeter against black and white ceramic tiles background to obtain the TP values. The color parameters of the specimens against the composite resin background were also measured and the color differences (ΔE values) between specimens and the A2 shade tab were calculated. Results One-way ANOVA showed that the translucency parameters of the 11 groups of materials were statistically significant (F=253.69, P<0.05). The ΔE values of CAD/CAM material groups ranged from 1.78 to 4.12 (ΔE values<5.5). Conclusions The microstructure of CAD/CAM materials and the types of material translucency influence the optical properties. The CAD/CAM materials in this experiment have achieved color matching with the A2 shade tab.