Análise da capacidade de remoção de pigmentos da resina composta pelo peróxido de hidrogênio 35%
Capacity analysis of pigment removal of composite resin by hydrogen peroxide 35%
Martini, Eveline Claudia; Coppla, Fabiana Madalozzo; Reis, Alessandra; Calixto, Abraham Lincoln
Resumo
Objetivo: Avaliar in vitro a capacidade de remoção de pigmentos ocasionados em resina composta após aplicação de peróxido de hidrogênio 35%. Material e método: Confeccionaram-se 20 amostras de resina composta Opallis (FGM), cor A1, em matriz metálica circular. As amostras foram divididas em quatro grupos (n=5) dos seguintes agentes corantes: água destilada (controle), café, vinho tinto e Coca-Cola®. No manchamento, as amostras ficaram imersas nas soluções durante 72 horas, com troca diária das bebidas. Procedeu-se à aplicação do gel de peróxido de hidrogênio 35% (Whiteness HP Blue Calcium, FGM) em três sessões, sendo uma aplicação do gel por sessão, o qual permaneceu nas amostras durante 40 minutos. Medidas de cor foram feitas inicialmente, após manchamento, após aplicação do peróxido e por mais 21 dias, usando espectrofotômetro Vita Easyshade. Os dados foram submetidos à análise de variância de dois fatores (tempo vs. corante) e ao teste de Tukey, para o contraste das médias (α=0,05). Resultado: Apresentaram alteração de cor (ΔE - média/desvio padrão de L*) o café (15,7 ± 2,0) e o vinho (15,2 ± 4,6), quando comparados à Coca-Cola® (4,8 ± 1,9). O peróxido de hidrogênio removeu a pigmentação das amostras, porém, para nenhum dos corantes, houve retorno à coloração inicial, principalmente no grupo manchado por café (12,9 ± 1,5); este mostrou diferença significativa quando comparado ao controle (1,6 ± 0,6), diferentemente do vinho (3,3 ± 0,6) e da Coca-Cola® (2,1 ± 0,9), que se aproximaram do grupo controle. Conclusão: As soluções corantes pigmentaram a resina composta, principalmente o café. A aplicação do peróxido de hidrogênio 35% foi eficaz na remoção de pigmentos das amostras, porém, em nenhum dos grupos, com diferentes corantes, houve retorno à coloração inicial (p>0,005).
Palavras-chave
Abstract
Objective: Evaluate in vitro the ability to removal pigments of composite resin after application of hydrogen peroxide 35%. Material and method: Concocted to-20 resin samples composed Opallis (FGM), A1 color, in circular metal matrix. The samples were divided into 4 groups (n = 5) the following coloring agents: distilled water (control), coffee, red wine and Coca-Cola®. In the staining, the samples were immersed in the solutions for 72 hours, with daily change of beverages. Proceeded to the application of 35% hydrogen peroxide gel (Whiteness HP Blue Calcium, FGM) in 3 sessions, one application of gel per session that remained in the samples for 40 minutes. Color measurements were made initially after staining after application of the peroxide and for 21 days using Vita Easyshade spectrophotometer. The data were submitted to two-way ANOVA and Tukey’s test (α = 0.05). Result: Significant color change was observed in specimens after immersion in the solutions, except the control group. Hydrogen peroxide was capable of removing the stains, however the color did not return to the baseline in any of the staining groups, especially for the groups immersed in coffee. Conclusion: Staining solutions can stain the composite resin. The application of 35% hydrogen peroxide can remove partially the staining, minimizing the color change produced by the staining solutions. However, the bleaching gel was not capable of removing all staining, especially for the coffee group.
Keywords
References
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