Análise das propriedades estruturais da resina acrílica termopolimerizável após 1 ano de imersão em extrato hidroalcoólico de punica granatum linné

Abstract

Prosthetic hygiene is critical for maintaining the health of oral tissues and for the successful use of removable dental prostheses (RDPs). The ideal cleaning agent should have antimicrobial properties and it should not cause damage to the prosthesis materials. However, literature has already reported adverse effects caused by these agents. Natural products have been presented as an alternative to synthetic chemicals substances and a wide variety of plant extracts exhibiting antifungical properties, such as the Punica granatum Linné (pomegranate), has been reported. Thus, the aim of this in vitro study was to analyze the effects on the mass and on surface roughness of thermopolymerizable acrylic resin samples submitted to daily immersion in 6.7% hydroalcoholic extract solution of pomegranate, simulating the period of 1 year of immersion. Thirty specimens of thermopolymerizable acrylic resin were prepared and distributed in 3 groups (n = 10) according to the cleaning solution: group 1 (solution of 6.7% pomegranate extract), group 2 (alkaline peroxide solution, positive control) and group 3 (distilled water, negative control). The analyzes were performed before and after the immersions in the solutions. The mass change was determined by an analytical electronic scale, with sensitivity of 0.1 mg. A rugosimeter was used to analyze any change in surface roughness (Ra, μm). The obtained data were submitted to the Kolmogorov-Smirnov normality test and compared by the ANOVA test followed by the Bonferroni post-test. Regarding the mass changes, the group treated with distilled water showed the lowest mass gain, varying 50.3 ± 5.2mg, a value significantly lower than the group treated with corega (179.6 ± 9.6 mg). The group treated with pomegranate (109.7 ± 6.4 mg) showed a mass variation significantly higher than the group treated with distilled water, but lower than the group treated with corega (p <0.001). Regarding the surface roughness, there was no variation with significant difference in the three experimental groups (p = 0.999). It was concluded that the use of 6.7% hydroalcoholic extract solution of pomegranate did not significantly alter the properties of the acrylic resin. Keywords: Immersion. Punica granatum. Acrylic Resins.