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目的：探讨经过二期处理的光固化复合树脂其径向抗张强度和硬度与单纯光固化复合树脂的差异。方法：Ｓｔａｒｆｉｌ Ａ２０ 、后牙用复合树脂、Ｒｅｓｔｏｒａｔｉｖｅ Ｚ１００ 三种光固化复合树脂光固化４０ｓ 后，分别光照５ｍｉｎ，１４０℃加热处理７．５ｍｉｎ 和０ ．６ＭＰａ １２０℃加热加压处理７ｍｉｎ ，测量其径向抗张强度和硬度。结果：径向抗张强度测试：经过处理的光固化复合树脂除光照５ｍｉｎ 组外，其它两个处理组均高于对照组（ 仅光固化４０ｓ），且有统计学差异（ Ｐ＜ ０．０５） 。硬度测试：除Ｓｔａｒｆｉｌ Ａ２０ 和后牙用复合树脂光照５ｍｉｎ 组外，其余各处理组均高于对照组，且有统计学差异（Ｐ＜ ０ ．０５） 。结论：与单纯光固化复合树脂相比，经过二期处理的光固化复合树脂，其径向抗张强度和硬度不同程度的提高。
OBJECTIVE: To investigate the differences of radial tensile strength and hardness of light-cured composite resin after two treatments with that of simple light-cured composite resin. Methods: After curing with Starfil A20, composite resin for posterior teeth and Restorative Z100 for 40s under light curing for 5min and 140 ℃ for 7.5min and 0, respectively. 6MPa 120 ℃ heating and pressing 7min, measuring the radial tensile strength and hardness. Results: Radial tensile strength test: The light-cured composite resin treated with 5 min light was the same as the control group (only light-cured 40 s), and there was a significant difference (P <0.05 ). Hardness test: except Starfil A20 and posterior teeth with composite resin light 5min group, the rest of the treatment group were higher than the control group, and there was a significant difference (P <0 .05). Conclusion: Compared with the light-cured composite resin, the light-cured composite resin after two treatments showed different degrees of increase in radial tensile strength and hardness.