期刊论文详细信息
Brazilian Dental Journal
Effect of repeated disinfections by microwave energy on the physical and mechanical properties of denture base acrylic resins
Rafael Leonardo Xediek Consani2  Douglas Duenhas De Azevedo1  Marcelo Ferraz Mesquita2  Wilson Batista Mendes1  Paulo César Saquy1 
[1] ,State University of Campinas Piracicaba Dental School Department of Prosthodontics and PeriodonticsPiracicaba SP ,Brazil
关键词: hardness;    impact;    flexural strength;    acrylic resin;    microwave disinfection;   
DOI  :  10.1590/S0103-64402009000200008
来源: SciELO
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【 摘 要 】

The present study evaluated the effect of repeated simulated microwave disinfection on physical and mechanical properties of Clássico, Onda-Cryl and QC-20 denture base acrylic resins. Aluminum patterns were included in metallic or plastic flasks with dental stone following the traditional packing method. The powder/liquid mixing ratio was established according to the manufacturer's instructions. After water-bath polymerization at 74ºC for 9 h, boiling water for 20 min or microwave energy at 900 W for 10 min, the specimens were deflasked after flask cooling and finished. Each specimen was immersed in 150 mL of distilled water and underwent 5 disinfection cycles in a microwave oven set at 650 W for 3 min. Non-disinfected and disinfected specimens were subjected to the following tets: Knoop hardness test was performed with 25 g load for 10 s, impact strength test was done using the Charpy system with 40 kpcm, and 3-point bending test (flexural strength) was performed at a crosshead speed of 0.5 mm/min until fracture. Data were analyzed statistically by ANOVA and Tukey's test (α= 0.05%). Repeated simulated microwave disinfections decreased the Knoop hardness of Clássico and Onda-Cryl resins and had no effect on the impact strength of QC-20. The flexural strength was similar for all tested resins.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License

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