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Ribeirão Preto, Brazil

Pisani M.X.,Dental Material and Prosthodontics | Da Silva C.H.L.,Dental Material and Prosthodontics | De Freitas Oliveira Paranhos H.,Dental Material and Prosthodontics | Souza R.F.,Dental Material and Prosthodontics | Macedo A.P.,Dental Material and Prosthodontics
Materials Research | Year: 2010

This study evaluated heat-polymerized (HPR) and microwave-polymerized acrylic resins (MPR), after immersion in water, 1% hypochlorite and Ricinus communis solution (RC). Knoop hardness, color alteration, roughness and flexural strength tests were performed after obtaining the specimens and after time intervals of 15 (T 15) and 183 (T 183) days. Variations in data (δ) were submitted to ANOVA and Tukey tests (P = 0.05). For δT 15 HPR there was greater variation in hardness when immersed in water (P = 0.00) and for MPR, after immersion in RC (P = 0.00). RC caused the greatest variation in roughness (P = 0.015). Color alteration was not significant (P = 24.46). Hypochlorite caused a decrease in flexural strength (P = 0.37). After δT 183, hypochlorite and RC caused a decrease in HPR hardness value (P = 0.00). MPR showed the greatest variation in roughness (P = 0.01). HPR presented the most color alteration after immersion in RC (P = 0.214). Hypochlorite and RC caused the lowest flexural strength values for MPR (P = 0.89). RC caused alterations in resin properties, and was not shown to be superior to hypochlorite.

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