ObjectiveChemical solutions have been widely used for disinfection of dentures, but their effect on color stability of denture tooth acrylic resins after repeated procedures is still unclear. The aim of this in vitro study was to evaluate whether repeated cycles of chemical disinfectants affected the color stability of two denture tooth acrylic resins. Material and MethodsSixty disc-shaped specimens (40 mm x 3 mm) were fabricated from two different brands (Artiplus and Trilux) of denture tooth acrylic resin. The specimens from each brand (n=30) were randomly divided into 6 groups (n=5) and immersed in the following solutions: distilled water (control group) and 5 disinfecting solutions (1% sodium hypochlorite, 2% sodium hypochlorite, 5.25% sodium hypochlorite, 2% glutaraldehyde, and 4% chlorhexidine gluconate). Tooth color measurements were made by spectrophotometry. Before disinfection, the initial color of each tooth was recorded. Further color measurements were determined after subjecting the specimens to 7, 21, 30, 45, 60, and 90 immersion cycles in each tested solution. Color differences (ΔE*) were determined using the CIE L*a*b* color system. Data were analyzed using two-way repeated measures analysis of variance (ANOVA) followed by Tukey tests. The significance level was set at 5%. ResultsThere were statistically significant differences in ΔE* among the 5 disinfectants and water during the 90 cycles of immersion for both denture tooth acrylic resins. Distilled water promoted the greatest color change in both denture tooth acrylic resins, nevertheless none of tested disinfectants promoted ΔE* values higher than 1.0 on these acrylic materials during the 90 cycles of disinfection. ConclusionsRepeated immersion cycles in disinfecting solutions alter ∆E* values, however these values do not compromise the color of the tested denture tooth acrylic resins because they are imperceptible to the human eye.

Our results suggest that the presence of saliva might influence the adhesion of C. albicans and improve the effectiveness of methods to reduce fungal adhesion.

O objetivo do presente estudo foi analisar as evidências científicas sobre clareamento dental, os protocolos de aplicação em consultório e as melhores condutas clínicas. Foram realizada uma busca no banco de dados PubMed, Google Acadêmico e LiLacs para identificar as investigações disponíveis no período de 2009 a 2019. As seguintes palavras-chave foram utilizadas na busca: “CLAREAMENTO DENTAL” em português e também em inglês “TOOTH WHITENING”. O clareamento dentário é um procedimento muito procurado na atualidade, com resultados estéticos satisfatórios quando feita a correta indicação e adequado uso. Entretanto, deve ser executado de forma cautelosa, tanto pelo profissional quanto pelo paciente, para proporcionar proteção pulpar e periodontal eficientes e não agredir tecidos importantes, evitando inflamações e sensibilidade pós-operatória, além de recidivas e manchamentos pós-operatórios.