固化模式对双固化树脂水门汀微观机械性能及聚合程度的影响  

Effect of curing modes on nano-mechanical properties and monomer conversion of dual-cure dresin cements

作　　者：黄沁[1] 杨博[1] 杨家俊 霍兆麟 王焱[1] Huang Qin;Yang Bo;Yang Jiajun;Huo Zhaolin;Wang Yan(Guanghua School of Stomatology,Hospital of Stomatology,Sun Yat-sen University,Guangdong Provincial Key Laboratory of Stomatology,Guangzhou 510055,China;Minnesota Dental Research Center for Biomaterials and Biomechanics,School of Dentistry,University of Minnesota,Minneapolis,MN 55455,USA)

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]明尼苏达大学牙学院牙科生物材料及生物力学研究中心,美国明尼阿波利斯55455

出　　处：《中华口腔医学研究杂志（电子版）》2018年第4期199-204,共6页Chinese Journal of Stomatological Research(Electronic Edition)

基　　金：国家自然科学基金(海外及港澳学者合作研究基金项目,81628005)

摘　　要：目的研究不同固化模式对临床常用的两种双固化树脂水门汀表面纳米硬度、弹性模量、压入蠕变等微观机械性能及聚合程度的影响。方法采用即刻光照、间歇光照、延迟光照和无光照四种不同的固化模式,分别对Rely X Unicem、Perma Cem 2.0两种双固化树脂水门汀进行固化,制备厚度为0.5 mm、直径5 mm的圆形测试试件。室温避光保存24 h后,使用纳米压痕法对表面纳米硬度、弹性模量、压入蠕变等微观机械性能进行测量,使用傅立叶变换红外光谱-衰减全发射法测试材料的转化率。利用SPSS 16.0软件对数据进行分析(α=0.05)。结果固化模式对本实验选用的两种双固化树脂水门汀的表面纳米硬度、弹性模量有显著影响(P<0.001)。对于Rely X Unicem,无光照组的表面纳米硬度、弹性模量最低,分别为(153.1±14.6)MPa和(7.6±0.7)GPa,即刻、间歇、延迟光照组差异无统计学意义。对于Perma Cem 2.0,无光照组的表面纳米硬度、弹性模量最低,分别为(244.8±21.1)MPa和(7.3±0.5)GPa,即刻、间歇、延迟光照组差异无统计学意义。固化模式对Rely X Unicem的压入蠕变有显著影响(F=135.41,P<0.001),对Perma Cem 2.0也有显著影响(F=148.94,P<0.001),其由高到低依次为:无光照组>延迟光照组>即刻、间歇光照组。固化模式对Perma Cem 2.0的转化率有显著影响(F=20.76,P=0.004),但对Rely X Unicem的转化率无显著影响(F=0.899,P=0.447)。结论双固化树脂水门汀在无光照时容易固化不全,降低其微观机械性能。即刻、间歇光照比延迟光照更有利于降低树脂水门汀的压入蠕变。固化模式对不同种类的双固化树脂水门汀聚合程度及微观机械性能的影响程度不同。Objective To investigate the influence of different curing modes on nanohardness,elastic modulus,indentation creep and monomer conversion of two types of dual-cured resin cements.Methods Specimens of 5 mm diameter and 0.5 mm thickness were fabricated with two dual-cured resin cements:RelyX Unicem(RU)and PermaCem 2.0(PC),under four different curing modes:immediate light-curing mode(IML),intermittent light-curing mode(ITL),delayed light-cuing mode(DL)and chemical curing mode(CC).After 24 hours′storage in darkness at room temperature,nanohardness,elastic modulus and indentation creep were measured with a nanoindentation device under a 10 mN load for 20 s holding time.Monomer conversion was measured by Fourier transform infrared spectroscopy-attenuated total reflection.Data were analyzed by SPSS 16.0 software(α=0.05).Results Curing modes showed significant influence on nanohardness and elastic modulus for both RU and PC(P<0.001).For RU,nanohardness and elastic modulus of CC group were the lowest among the four curing modes,which were(153.1±14.6)MPa and(7.6±0.7)GPa,respectively.For PC,nanohardness and elastic modulus of CC group were the lowest among the four curing modes,which were(244.8±21.1)MPa and(7.3±0.5)GPa,respectively.There were no significant differences in nanohardness and elastic modulus among IML,ITL and DL groups for both RU and PC.Curing modes showed significant influence on indentation creep for RU(F=135.41,P<0.001)and PC(F=148.94,P<0.001),which ranked in the following order:CC>DL>IML,ITL.For RU,there were no significant difference in monomer conversion among the four curing modes(F=0.899,P=0.447).However,there were significant difference in monomer conversion among the four curing modes for PC(F=20.76,P=0.004).Conclusions Lack of light activation resulted in an insufficient polymerization and compromised mechanical properties for dual-cured resin cements.Immediate and delayed light curing modes produce higher indentation creep.Curing modes had different levels of impact on the mechanical propert

关 键 词：树脂粘固剂 牙科胶粘剂光固化 牙科树脂类自固化 机械性能 转化率 固化模式 

分 类 号：R783.1[医药卫生—口腔医学]