摘要
目的比较4种室温固化型PMMA与热固化型PMMA粘结后的拉伸强度,为临床应用提供理论依据。方法根据GB/T 1040-92塑料拉伸测量标准,使用不锈钢模具制备40对热固化型PMMA(贺利氏)标准试件,分4组,分别与4种室温固化PMMA(贺利氏纤维型、上海齿科单纯型、日进纤维型、德山硬衬型)粘结。在电子万能材料试验机测定拉伸强度,通过体式显微镜观察粘结破坏形式。结果 4种室温固化型PMMA材料与热固化型PMMA材料粘结后的拉伸强度分别为(31.50±4.55)、(30.80±7.35)、(24.10±3.96)、(17.70±3.27)M Pa,前两组之间没有统计学意义(P>0.05),与后两组均存在差异(P<0.05)。体式显微镜观察证实大部分试件的破坏形式为粘结界面破坏。结论贺利氏的拉伸强度与上齿相似且最高,日进的次之,德山的最低。
Objective To compare the tensile bond strength between four kinds of room temperature PMMA and heat-curing PMMA,provide theory evidence for clinical application. Methods According to GB/T 1040-92 plastics of tensile bond strength standard, manufacture forty pairs of heat-curing PMMA （Heraeus） specimen using standard stainless steel mould,divide into four groups,respectively adhesion with four kinds of room temperature curing PMMA （Heraeus,Shanghai dental,Nisshin,TOKUYAMA）. The tensile bond strength was measured by electric universal tes- ting machine, the bond failure characteristics was observed by stereoscopic microscope. Results The tensile bond strength between four kinds of room temperature PMMA and heat-curing PMMA respectively was（31. 50 ±4. 55）, （30. 80 ±7. 35）, （24. 10 ± 3. 96 ）, （17. 70 ± 3. 27） M Pa, there were no statistical significance between the first two groups（P〉0.05）, but remarkable difference with the other two groups（P〈0.05）. The bond failure characteristics of great majority specimen was adhesive failure. Conclusion The best tensile bond strength was Heraeus and Shanghai, the other was usual.
出处
《中国实验诊断学》
2013年第2期237-239,共3页
Chinese Journal of Laboratory Diagnosis
基金
吉林省科技发展计划项目资助课题(20090462)
关键词
室温固化
热固化
聚甲基丙烯酸甲酯
粘结强度
room temperature cure
heat-cure
polymethyl methacrylate
adhesion Strength
