关键词: 基托聚合方法, 电热聚合法, 挠曲强度, 环境扫描电镜, Denture polymerlization methods, Electric-heating methods, Flexural strength, ESEM

Abstract: [Abstract] Objective To evaluate the influence of the electric-heating polymerlization methods on the flexural strength of 2 denture base polymers. Methods Two denture-base resins were selected, and the species were prepared by traditional water-bath methods or electric-heating methods and which were divided into 4 groups：Nissin water-bath group, Heraeus water-bath group, Nissin electric-heating group and Heraeus electric-heating group (n=10). The flexural strength of species were evaluated. Statistical software (SPSS13.0) was used (α=0.05) in data analysis. The section of species were observed with environment scanning electron microscope. Results The flexural strength of each species fulfilled the requirement of Chinese Pharmaceutical industry Standards YY0270 – 2003. The flexural strength of the Nissin species prepared by electric-heating were a little higher [(93.28±4.80) MPa], and the differences were significant (P<0.05). At the same time, there was no differences between the other groups. But there were obvious differences between each groups in the microstructure of sections. Conclusion There was no significant influence of the electric-heating polymerlization methods on the flexural strength of the denture base polymers. The flexural strength of all the species fulfilled the Standards YY0270 – 2003.