不同聚合方法对热凝基托树脂力学性能的影响

Mechanical properties of denture base resin polymerized by different methods

背景:近年来,新型热凝基托树脂可以采用快速方法进行聚合,这种快速聚合的方法对热凝基托树脂力学性能及微观结构有什么影响?目的:观察快速和传统方法聚合热凝基托树脂后其力学性能的变化。方法:实验分为两组,实验组为热凝基托树脂经过快速方法聚合,对照组为热凝基托树脂传统方法聚合,两种方法聚合的基托树脂试样在材料试验机上对其冲击强度、弯曲强度、弹性模量和布氏硬度进行测定,并对断面进行扫描电镜观察。结果与结论:快速聚合基托树脂和传统聚合基托树脂的冲击强度分别为(6.73±1.23),(7.35±0.93)kJ/mm3;弯曲强度为(89.93±12.92),(90.19±6.88)MPa;弹性模量为(2.2±0.2),(2.4±0.1)GPa,布氏硬度为(20.70±2.89),(19.57±1.05)kg/mm2,其各项力学性能差异无显著性意义(P>0.05);扫描电镜观察不同方法聚合的基托树脂断面的微观结构也比较相似。提示基托树脂的力学性能和微观结构不受不同聚合方法的影响。

BACKGROUND：Novel denture base resin can be polymerized rapidly.However,the effect of this method on resin mechanical performance and microstructure remains unclear.OBJECTIVE：To observe the effects on the mechanical properties of denture base resin polymerized by different methods.METHODS：The denture base resin of experimental and control groups were respectively polymerized by rapid or traditional methods.The impact strength,flexural strength,elastic modulus and Brinell hardness of two groups were measured.The cross-sections of different resin samples were detected by scanning electron microscopy.RESULTS AND CONCLUSION：The impact strength of resin were（6.73±1.23）and（7.35±0.93）kJ/mm3,the flexural strength were（89.93±12.92）and（90.19±6.88）MPa,the elastic modulus were（2.2±0.2）and（2.4±0.1）GPa,and the Brinell hardness were（20.70±2.89）and（9.57±1.05）kg/mm2,respectively in experimental and control groups.All data of two different groups were not statistically significant（P 0.05）.Microstructures of cross-sections of two different groups observed by scanning electron microscopy were also similar.The mechanical properties and the microstructures of the denture base resin were not affected by different polymerization methods.