title: Effect of cleanser solutions on the color of acrylic resins associated with titanium and nickel-chromium alloys.
abstract: This study evaluated the effect of cleanser solutions on the color of heat-polymerized acrylic resin (HPAR) and on the brightness of dental alloys with 180 immersion trials. Disk-shaped specimens were made with I) commercially pure titanium, II) nickel-chromium-molybdenum-titanium, III) nickel-chromium molybdenum, and IV) nickel-chromium-molybdenum beryllium. Each cast disk was invested in the flasks, incorporating the metal disk into the HPAR. The specimens (n=5) were then immersed in solutions containing: 0.05% sodium hypochlorite, 0.12% chlorhexidine digluconate, 0.500 mg cetylpyridinium chloride, a citric acid tablet, one of two different sodium perborate/enzyme tablets, and water. The color measurements (∆E) of the HPAR were determined by a colorimeter in accordance with the National Bureau of Standards. The surface brightness of the metal was visually examined for the presence of tarnish. The results (ANOVA; Tukey test-α=0.05) show that there was a significant difference between the groups (p<0.001) but not among the solutions (p=0.273). The highest mean was obtained for group III (5.06), followed by group II (2.14). The lowest averages were obtained for groups I (1.33) and IV (1.35). The color changes in groups I, II and IV were slight but noticeable, and the color change was considerable for group III. The visual analysis showed that 0.05% sodium hypochlorite caused metallic brightness changes in groups II and IV. It can be concluded that the agents had the same effect on the color of the resin and that the metallic alloys are not resistant to the action of 0.05% sodium hypochlorite.
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Helena de
authors.initials: Hd
authors.lastname: Freitas Oliveira Paranhos
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Osvaldo Luiz
authors.initials: OL
authors.lastname: Bezzon
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Letícia Resende
authors.initials: LR
authors.lastname: Davi
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Daniela Nair Borges
authors.initials: DN
authors.lastname: Felipucci
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Cláudia Helena Lovato da
authors.initials: CH
authors.lastname: Silva
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Valéria Oliveira
authors.initials: VO
authors.lastname: Pagnano
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000497:Alloys / Q000737:chemistry; D000704:Analysis of Variance; D002858:Chromium Alloys / Q000737:chemistry*; D003116:Color; D019551:Dental Disinfectants / Q000737:chemistry; D003820:Denture Cleansers / Q000737:chemistry*; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D058105:Polymerization; D017797:Prosthesis Coloring; D011897:Random Allocation; D012973:Sodium Hypochlorite / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D000497:Alloys; D002858:Chromium Alloys; D019551:Dental Disinfectants; D003820:Denture Cleansers; D014025:Titanium; D012973:Sodium Hypochlorite