Resumo

REIS, Luciana; ZANETTI, Artêmio Luiz; CASTRO JUNIOR, Osmar Vieira  e  MARTINEZ, Elizabeth Ferreira. Use of 0.25% and 0.025% peracetic acid as disinfectant agent for chemically activated acrylic resin: an in vitro study. RGO, Rev. gaúch. odontol. (Online) [online]. 2012, vol.60, n.3, pp. 315-320. ISSN 1981-8637.

Objective This in vitro study evaluated the disinfection action of peracetic acid on chemically activated acrylic resin. Methods Sixty chemically activated acrylic resin specimens were contaminated with Candida albicans (30) and Bacillus subtilis (30) for 15 minutes. Next, specimens were divided into Control Group (Group 0) and Test Group (T) for each studied microorganism. The antimicrobial effect of Proxitane® Alfa (Thech Desinfecção, São Paulo, Brazil), containing 0.25% and 0.025% concentrations of peracetic acid was verified after 1, 3, 5 and 10 minutes of exposure. The specimens were transferred to saline solution for 5 minutes, homogenized and aliquots of 100μL were plated on BHI and Sabouraud Dextrose agar. After incubation at 37ºC/24h, the number of CFU/mL recovered from each specimen was obtained. Results The 0.025 % peracetic acid was effective against B. subtilis only after 10 minutes and against C. albicans after 3 minutes of exposure. At 0.25% concentration, the solution showed fungicidal and bactericidal efficacy after 1 minute of exposure. Conclusion The 0.25% peracetic acid was shown to be efficient for disinfection of chemically activated acrylic resins.

Palavras-chave : Acrylic resin.; Complete denture.; Disinfection.; Peracetic acid..