微波消毒甲基丙烯酸树脂义齿的实验研究

目的 研究微波应用于甲基丙烯酸树脂基托义齿的消毒效果以及对义齿基托材料力学性能的影响.方法 选择40件常规制作完成的甲基丙烯酸树脂基托义齿,随机分成A、B、C、D 4组,每组10件,D组为对照组.将A、B、C、D组义齿放入装有200ml蒸馏水的烧杯中,A、B、C组分别经700 W功率微波照射3,4,5 min后分别进行取样细菌培养,以抑菌率评价消毒效果;通过万能实验机测试微波照射前后甲基丙烯酸树脂的弯曲强度和冲击强度,观察微波照射对甲基丙烯酸树脂的力学性能的影响.结果 700 W功率的微波照射4 min的抑菌率≥90%,5 min的抑菌率达100%;700 W功率照射5 min组甲基丙烯酸树脂的弯曲强度和冲击强度与对照组比较无显著差异.结论 700 W功率的微波照射5 min可以有效杀灭甲基丙烯酸树脂义齿表面的所有细菌,并对甲基丙烯酸树脂的弯曲强度和冲击强度无明显影响,可以用于甲基丙烯酸树脂基托义齿的消毒.

Abstract：

Objective The purpose of this study was to evaluate the disinfection effectiveness and properties of acrylic resin via microwave irradiation. Methods Forty acrylic resin base dentures fabricated in a standardized procedure were chosen and divided into Group A,B,C and D randomly. Group A,B and C were immersed in 200ml distilled water and submitted to microwave irradiation at 700W for 3,4,5 minutes individually. Group D was used as positive control. Bacteria specimens from each group were got for culture and numbers were calculated. Then the four groups were tested for the flexural strength and impact strength by universal test machine before and after microwave irradiation sterilization. Results The germicidal ratio of Group B was more than 90% ,while the ratio of group C was 100%. There was no significant difference in flexural strength and impact strength between group C and group D. Conclusions Microwave irradiation for 5 minutes at 700W produced sterilization of dentures contaminated with all bacteria whereas the denture strength is not affected. Microwave irradiation at 700W solution for 5 minutes was effective to sterilize acrylic resin base dentures.

Study on disinfection effectiveness and properties of acrylic resin via microwave irradiation sterilization

Objective The purpose of this study was to evaluate the disinfection effectiveness and properties of acrylic resin via microwave irradiation. Methods Forty acrylic resin base dentures fabricated in a standardized procedure were chosen and divided into Group A,B,C and D randomly. Group A,B and C were immersed in 200ml distilled water and submitted to microwave irradiation at 700W for 3,4,5 minutes individually. Group D was used as positive control. Bacteria specimens from each group were got for culture and numbers were calculated. Then the four groups were tested for the flexural strength and impact strength by universal test machine before and after microwave irradiation sterilization. Results The germicidal ratio of Group B was more than 90% ,while the ratio of group C was 100%. There was no significant difference in flexural strength and impact strength between group C and group D. Conclusions Microwave irradiation for 5 minutes at 700W produced sterilization of dentures contaminated with all bacteria whereas the denture strength is not affected. Microwave irradiation at 700W solution for 5 minutes was effective to sterilize acrylic resin base dentures.