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http://repositorio.unicamp.br/jspui/handle/REPOSIP/198096
Type: | Artigo de periódico |
Title: | Effect Of Microwave Disinfection On Physical And Mechanical Properties Of Acrylic Resins. |
Author: | Consani, Rafael Leonardo Xediek Vieira, Erica Brenoe Mesquita, Marcelo Ferraz Mendes, Wilson Batista Arioli-Filho, João Neudenir |
Abstract: | This study evaluated the effect of microwave energy on the hardness, impact strength and flexural strength of the Clássico, Onda-Cryl and QC-20 acrylic resins. Aluminum die were embedded in metallic or plastic flasks with type III dental stone, in accordance with the traditional packing technique. A mixing powder/liquid ratio was used according to the manufacturer's instructions. After polymerization in water batch at 74 degrees C for 9 h, boiling water for 20 min or microwave energy at 900 W for 10 min, the specimens were deflasked after flask cooling at room temperature, and submitted to finishing. Specimens non-disinfected and disinfected by microwave irradiation were submitted to hardness, impact and flexural strength tests. Each specimen was immersed in distilled water and disinfected in a microwave oven calibrated to 650 W for 3 min. Knoop hardness test was performed with 25 g load for 10 s, impact test was carried out using the Charpy system with 40 kpcm, and 3-point bending test with a crosshead speed of 0.5 mm/min until fracture. Data were submitted to statistical analysis by ANOVA and Tukey's test (alpha=0.05). Disinfection by microwave energy decreased the hardness of Clássico and Onda-Cryl acrylic resins, but no effect was observed on the impact and flexural strength of all tested resins. |
Subject: | Acrylic Resins Dental Stress Analysis Disinfection Equipment Contamination Hardness Materials Testing Microwaves Pliability |
Citation: | Brazilian Dental Journal. v. 19, n. 4, p. 348-53, 2008. |
Rights: | fechado |
Address: | http://www.ncbi.nlm.nih.gov/pubmed/19180326 |
Date Issue: | 2008 |
Appears in Collections: | Unicamp - Artigos e Outros Documentos |
Files in This Item:
File | Size | Format | |
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pmed_19180326.pdf | 138.73 kB | Adobe PDF | View/Open |
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