注塑微波法制作树脂基托对义齿精度的影响

Effect of injection microwave polymerization on accuracy of denture base resin

背景:近年来,注塑微波聚合技术在临床应用越来越多,其制作义齿精度方面的研究在国内鲜见报道。目的:观察注塑微波方法对树脂基托义齿精度的影响。方法:用注塑微波法和水浴法分别制作上颌全口义齿各10个,然后在上颌第二磨牙远中部位切断义齿基托与标准模型,用数字显微镜测量上颌全口义齿基托组织面与标准模型之间共5个部位的间隙。结果与结论:注塑微波法制作的义齿5个部位的精度为:(200±32),(76±13),(69±15),(81±16),(187±27)μm,水浴法制作的义齿5个部位的精度为:(243±50),(100±26),(96±30),(109±32),(213±28)μm,两种方法在相同点处差异有显著性意义(P<0.05)。提示在精度方面,注塑微波法制作的义齿优于水浴法,并且注塑微波法聚合时间较水浴法明显缩短。

BACKGROUND：In recent years,clinical applications of injection microwave polymerization have been on the rise.However,reports on its production of denture precision are rarely seen in China and the accuracy needs further verification.OBJECTIVE：To evaluate the effect of injection microwave polymerization on accuracy of denture base resin.METHODS：The study was to compare the difference of denture base resin cured by injection microwave polymerization and water-bath heat polymerization.The dimensional accuracy between the posterior border of upper complete denture and standardized cast at five different positions was measured by digital microscope.RESULTS AND CONCLUSION：The five posterior border gaps between the upper complete denture and standardized cast were（200±32） μm,（76±13） μm,（69±15） μm,（81±16） μm,（187±27） μm by the injection microwave polymerization,and（243±50） μm,（100±26） μm,（96±30） μm,（109±32） μm,（213±28） μm by the water-bath heat polymerization.There was significant difference between the two groups（P 0.05）.Injection microwave polymerization is better than water-bath heat polymerization on accuracy of denture base resin,and the time that injection microwave polymerization takes is shorter than that by water-bath heat polymerization.