title: Effect of microwave disinfection on denture base adaptation and resin surface roughness.
abstract: This study evaluated the effect of disinfection methods [chemical disinfection (immersion in 100 ppm chloride solution) or microwave disinfection (690 W for 6 min)] on the internal adaptation of denture bases and resin surface roughness. For the adaptation test, 18 maxillary denture bases were obtained from stone casts duplicated from a metallic master model and submitted to the following treatments: 1) control (no disinfection), 2) chemical disinfection or 3) microwave disinfection. Disinfection procedures were performed twice (T1, T2) with a 7-day interval between them. Internal adaptation was measured at baseline (T0) and after T1 and T2 by weighing a vinyl polysiloxane film reproducing the gap between the resin base and the master model. For surface roughness measurement, 60 rectangular (5x10x40 mm) resin specimens were either mechanically or chemically polished and then submitted to the disinfection treatments. Surface roughness (Ra) was recorded after polishing (T0) and after T1 and T2. Data were analyzed by ANOVA GLM for repeated measures and Bonferroni correction at 5% significance level. Bases submitted to microwave disinfection had gradual increase of misfit, while bases immersed in chloride solution did not differ from the control group. Surface roughness increased in the mechanical polishing groups with microwave disinfection and decreased in the chemical polishing groups.
authors.affiliation: Department of Prosthodontics, Dental School, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: Evandro Afonso
authors.initials: EA
authors.lastname: Sartori
authors.forename: Caroline Bom
authors.initials: CB
authors.lastname: Schmidt
authors.forename: Luiz Fernando
authors.initials: LF
authors.lastname: Walber
authors.forename: Rosemary Sadami Arai
authors.initials: RS
authors.lastname: Shinkai
mesh_terms: D002713:Chlorine / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D003775:Dental Polishing / Q000379:methods; D003819:Denture Bases; D004202:Disinfectants / Q000737:chemistry; D004203:Disinfection / Q000379:methods*; D006801:Humans; D008872:Microwaves / Q000627:therapeutic use*; D019904:Polymethyl Methacrylate / Q000737:chemistry* / Q000528:radiation effects; D011145:Polyvinyls / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003764:Dental Materials; D004202:Disinfectants; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane; D002713:Chlorine; D019904:Polymethyl Methacrylate