title: Effect of toothbrushing, chemical disinfection and thermocycling procedures on the surface microroughness of denture base acrylic resins.
abstract: OBJECTIVE
  This study verified the surface microroughness of denture acrylic resins submitted to toothbrushing, chemical disinfection and thermocycling procedures.
  
  
  METHODS
  Samples were prepared according to conventional, microwaved and boiled resins and submitted to microroughness measurements before and after procedures using a profilometer (Ra). Data were subjected to anova and Tukey's test (5%).
  
  
  RESULTS
  Before thermocycling, a difference was found among treatments for microwaved and boiled resins, with greater values for toothbrushing and lower values for Efferdent and hypochlorite; control was intermediate. Differences among resins were observed for treatments, with higher values for boiled resin and lower values for conventional and microwaved resins. After thermocycling, differences were found for microwaved resin, with a higher value for toothbrushing and a lower value for Efferdent and hypochlorite; control was intermediate. Tooth-brushed boiled resin presented higher values and hypochlorite lower values; control and Efferdent were intermediates. Differences among resins were seen for treatments, with higher values for boiled resin and lower values for conventional and microwaved resins. Boiled resin presented differences for toothbrushing and hypochlorite, before and after thermocycling procedures were compared.
  
  
  CONCLUSIONS
  For microwaved and boiled resins, toothbrushing and chemical disinfection promoted different levels of surface microroughness when associated or not with thermocycling.
authors.affiliation: Department of Prosthodontics and Periodontics, Piracicaba Dentistry School, State University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Andréa F
authors.initials: AF
authors.lastname: Lira
authors.forename: Rafael L X
authors.initials: RL
authors.lastname: Consani
authors.forename: Marcelo F
authors.initials: MF
authors.lastname: Mesquita
authors.forename: Mauro A A
authors.initials: MA
authors.lastname: Nóbilo
authors.forename: Guilherme E P
authors.initials: GE
authors.lastname: Henriques
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D019551:Dental Disinfectants / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods; D003819:Denture Bases; D006358:Hot Temperature; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry; D008422:Materials Testing; D008872:Microwaves; D058105:Polymerization; D017655:Silicon Compounds / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014099:Toothbrushing / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D017554:Carbon Compounds, Inorganic; D019551:Dental Disinfectants; D003764:Dental Materials; C488492:QC 20 (denture base resin); D017655:Silicon Compounds; C539103:onda cryl; D014867:Water; D006861:Hydrogen Peroxide; D012973:Sodium Hypochlorite; C022088:silicon carbide