title: Effect of repeated simulated disinfections by microwave energy on the complete denture base adaptation.
abstract: This study evaluated the effect of repeated microwave disinfections on the adaptation of the maxillar denture base using 2 different flask closure methods. Twenty stone cast-wax base sets were prepared for flasking by traditional cramp or RS system methods. Five bases for each method were submitted to 5 repeated simulated disinfections in a microwave oven with 650W for 3 minutes. Control bases were not disinfected. Three transverse cuts were made through each stone cast-resin base set, corresponding to canine, first molar, and posterior region. Measurements were made using an optical micrometer at 5 points for each cut to determine base adaptation: left and right marginal limits of the flanges, left and right ridge crests, and midline. Results for base adaptation performed by the flask closure methods were: traditional cramp (non-disinfected = 0.21 +/- 0.05mm and disinfected = 0.22 +/- 0.05mm), and RS system (non-disinfected = 0.16 +/- 0.05 and disinfected = 0.17 +/- 0.04mm). Collected data were submitted to ANOVA and Tukey test (alpha=.05). Repeated simulated disinfections by microwave energy did not cause deleterious effect on the base adaptation, when the traditional cramp and RS system flask closure methods were compared.
authors.affiliation: Department of Prosthodontics and Periodontics, Piracicaba Dentistry School, State University of Campinas, Piraci-caba, SP, Brazil.
authors.forename: Rafael L X
authors.initials: RL
authors.lastname: Consani
authors.forename: Rose Y
authors.initials: RY
authors.lastname: Iwasaki
authors.forename: Marcelo F
authors.initials: MF
authors.lastname: Mesquita
authors.forename: Wilson B
authors.initials: WB
authors.lastname: Mendes
authors.forename: Simonides
authors.initials: S
authors.lastname: Consani