AIM:To imitate the restoration of anterior tooth with light cured resin composite by multi-layered technology in vitro and to measure the optical properties of different layer-layer ratios. METHODS:Disks of resin com-posites Filtek Supreme XT 's YT(Yellow translucency)and A3B(Body shade) were prepared in the diameter of 9mm with various thicknesses(0. 5 mm,1. 0 mm,1. 5 mm and 2. 0 mm). YT/A3B overlap was prepared by the ratio of 0/2. 0,0. 5/1. 5,1. 0/1. 0,1. 5/0. 5 and 2. 0/0 respectively. PR-650 spectral scanning colorimeter was used to measure and calculate the translucency parameter( TP) ,opalescence parameter( OP) and fluorescence reflection( FL) . RESULTS:TP ,OP and FL values were higher with the increase of YT thickness. TP value of 0. 5/1. 5 group and 1. 0/1. 0 group was in the range of natural tooth. OP value of 2. 0/0 group was in the range of natural tooth. OP value of 1. 5/0. 5 was close to natural tooth. FL of all the combination groups was less than that of natural tooth. 0. 5/1. 5 group and 1. 0/1. 0 group didn't ex-cite fluorescence . CONCLUSION:Multi-layered technology of anterior restoration using A3B and YT can imitate the translucency and opalescence of natural tooth, but cannot imitate the fluorescence of natural tooth.%目的：：体外模拟前牙分层修复,测量复合树脂不同叠加厚度时的光学特性。方法：将Filtek Supreme XT 之半透明色YT(Yellow translucency)及体色A3B(Body shade),分别制作成直径为9 mm,厚度为0.5、1.0、1.5、2.0 mm的树脂块,YT/A3B叠加,分别为0/2.0、0.5/1.5、1.0/1.0、1.5/0.5、2.0/0。采用PR-650光谱扫描色度仪测量并计算半透性参数( TP值)、乳光参数( OP值)和荧光参数( FL值)。结果：随YT厚度增加、A3B厚度减小,树脂的TP值、OP值、FL值均增大。0.5/1.5、1.0/1.0组的TP值均在天然牙范围内；2.0/0组的OP值在天然牙范围内,1.5/0.5组的OP值接近天然牙；0/2.0、1.5/0.5、2.0/0叠加组合的荧光性均较天然牙弱,0.5/1.5、1.0/1.0并未激发出荧光。结论：复合树脂分层修复能够模拟天然牙的半透性、乳光性,荧光性尚有不足。
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