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Volume 16 , Issue 6
November/December 2003

Pages 616620

Effectiveness of Microwave Sterilization on Three Hard Chairside Reline Resins

Karin Hermana Neppelenbroek, DDS, MSc/Ana Cludia Pavarina, DDS, MSc, PhD/Denise Madalena Palomari Spolidorio, BSc, MSc, PhD/Carlos Eduardo Vergani, DDS, MSc, PhD/Ewerton Garcia de Oliveira Mima, DDS/Ana Lcia Machado, DDS, MSc, PhD

PMID: 14714840

Purpose: The aim of this study was to evaluate the effectiveness of microwave irradiation sterilization on hard chairside reline resins. Materials and Methods: Specimens of three reline resins (Kooliner, Tokuso Rebase, and Ufi Gel Hard) were fabricated and subjected to ethylene oxide sterilization. The specimens were then individually inoculated (107 cfu/mL) with Tryptic Soy Broth media containing one of the tested microorganisms (C albicans, S aureus, B subtilis,and P aeruginosa).After 48 hours at 37C, the samples were vortexed for 1 minute and allowed to stand for 9 minutes, followed by a short vortex to resuspend any organisms present. After inoculation, 40 specimens of each material were immersed in 200 mL of water and subjected to microwave irradiation at 650 W for 6 minutes. Forty nonirradiated specimens were used as positive controls. Replicate specimens (25 L) of suspension were plated at dilutions of 103 to 106 on plates of selective media appropriate for each organism. All plates were incubated at 37C for 48 hours. After incubation, colonies were counted, and the data were statistically analyzed by the Kruskal-Wallis test. Twelve specimens of each material were prepared for SEM. Results: All immersed specimens showed consistent sterilization of all the individual organisms after microwave irradiation. SEM examination indicated an alteration in cell morphology after microwave irradiation. Conclusion: Microwave sterilization for 6 minutes at 650 W proved to be effective for the sterilization of hard chairside reline resins. Int J Prosthodont 2003;16:616620.

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