光照模式对双固化树脂粘接剂聚合程度的影响  

Influence of light-curing modes on the polymerization of dual-cured resin cements

作　　者：赵佳萌[1] 王焱[2] 曾晨光[1] 朱文军[1] 

机构地区：[1]中山大学光华口腔医学院.附属口腔医院广东省口腔医学重点实验室,广州510055 [2]中山大学化学与化学工程学院

出　　处：《中华口腔医学研究杂志（电子版）》2013年第5期9-13,共5页Chinese Journal of Stomatological Research(Electronic Edition)

基　　金：广东省科技计划(2011B031300017);中央高校基本科研业务费专项资金(中山大学09ykpy61);广东省大学生创新训练项目(1055812380)

摘　　要：目的研究不同光照模式对两种双固化树脂粘接剂聚合程度的影响。方法采用间歇光照、即刻光照、延迟光照和无光照4种不同固化方式,分别制备3M RelyX Unicem和DMG PermaCem2.0双固化树脂试件,24 h避光保存后使用显微硬度仪测定样本表面硬度,三点弯曲试验测量挠曲强度,差示扫描量热仪进行玻璃化转变温度测量。数据采用协方差分析进行统计。结果两种树脂粘接剂各组表面硬度和挠曲强度由高到低依次为:间歇光照模式、即刻光照模式>延迟光照模式>无光照模式(P<0.05)。差示扫描量热分析未检测到明显吸热峰,不能确定玻璃化转变温度。除无光照组外,3M RelyX Unicem表面硬度均显著高于DMG PermaCem 2.0(P<0.05);DMG PermaCem 2.0挠曲强度显著高于3M RelyX Unicem(P<0.05)。结论间歇光照模式比延迟光照模式更有利于提高双固化树脂粘接剂聚合程度;双固化树脂粘接剂在无光照情况下聚合不全;与3M RelyX Unicem相比,DMG PermaCem 2.0抗压性能较差,但韧性较好,且无光照条件下聚合程度更高。Objective To evaluate the polymerization of dual-cured resin cements with various light-curing modes. Methods Specimens were fabricated with two brands of dual-cured resin cements： 3M RelyX Unicem and DMG PermaCem 2.0, by 4 different light curing modes： intermittent, immediate, delayed light-curing mode and without light-curing. After 24 h＇s storage in darkness, the surface hardness of the specimens was tested with a micro-hardness tester and the flexural strength was determined with three-point bending test. The glass transition temperature was measured with a differential scanning calorimeter （DSC）. Data were analyzed by covarianee analysis. Results The order of the surface hardness and flexural strengths of the 4 groups is as follows： intermittent light-curing group, immediate light-curing group 〉 delayed light-curing group 〉 without light-curing group, there were no significant differences between the intermittent light-curing group and immediate light-curing group, but significant differences were found among the other groups. The glass transition temperature cannot be identified as no significant endothermic peak was found in DSC test. Except for the without light-curing group, surface hardness of 3M RelyX Unicem was significantly higher than that of DMG PermaCem 2.0. The flexural strength of DMG PermaCem 2.0 was significantly higher than that of 3M RelyX Unicem. Conclusions Intermittent light-curing mode is more beneficial for improving the curing degree than delayed light-curing mode. Dual-cured resin cements can not set completely with purelychemical-cure mode. Compared with 3M RelyX Unicem, DMG PermaCem 2.0 shows poorer compressive performance, better toughness and higher degree of polymerization in the condition of no light.

关 键 词：双固化树脂粘接剂 聚合 硬度 挠曲强度 玻璃化转变温度 

分 类 号：R783[医药卫生—口腔医学]