微波聚合法对义齿基托树脂力学性能影响的研究

目的研究微波聚合方法对义齿基托树脂力学性能的影响。方法分别用微波聚合和水浴聚合方法制作63.0 mm×10.0 mm×2.5 mm的树脂试样各10个,经过10 000次冷热循环后,用电子万能试验机测量其弯曲强度和弯曲模量;同法制作同样规格的树脂试样各10个,用电子万能试验机测量其拉伸强度。结果微波法和水浴法制作的义齿基托树脂弯曲强度分别为（76.18±15.56）MPa和（73.06±13.01）MPa,差异无统计学意义（t=0.534 2,P〉0.05）;弯曲模量分别为（1 709.10±98.76）MPa和（1 699.21±90.23）MPa,差异无统计学意义（t=0.568 2,P〉0.05）;拉伸强度分别为（42.19±1.12）MPa和（44.35±1.22）MPa,差异无统计学意义（t=0.627 4,P〉0.05）。结论微波聚合方法制作的义齿基托树脂力学性能与水浴法制作的相当,但微波法聚合时间较水浴法明显缩短。

Effect of Microwave Polymerization on Mechanical Properties of Denture Base Resin

Objective To evaluate the effect of microwave polymerization and water-bath heat polymerization on mechanical properties of denture base resin.Methods Specimens with 63.0 mm×10.0 mm×2.5 mm were made by microwave polymeric mode or water-bath heat polymeric mode.Flexural strength and flexural modulus were tested using electronic universal test machine.And other 20 Specimens with 60.0 mm×4.0 mm×2.5 mm were made for measuring tensile strength by electronic universal test machine.Results The flexural strength of denture base resin cured by two methods was(76.18±15.56) MPa and(73.06±13.01) MPa respectively;flexural modulus was(1 709.10±98.76) MPa and(1 699.21±90.23) MPa respectively;tensile strength was(42.19±1.12) MPa and(44.35±1.22) MPa respectively.There were no statistical differences in mechanical properties between two groups(P>0.05).Conclusion Mechanical properties including flexural strength,flexural modulus and tensile strength of denture base Resin will not be affected by microwave polymerization compared to water-bath heat polymerization,but the time that microwave polymerization takes is shorter than that by water-bath heat polymerization.