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Avaliar a eficácia de agentes de branqueamento dentário em consultório
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Abstract(s)
Objetivos: O objetivo desta investigação in vitro foi avaliar e comparar a eficácia branqueadora de diferentes agentes de branqueamento dentário, com peróxido de hidrogénio com concentrações de 35% e 6%, e com ozono.
Materiais e Métodos: 20 molares seccionados no sentido mesio-distal foram distribuídos aleatoriamente por 4 grupos (n=10), consoante o agente branqueador a aplicar: Grupo PB - gel peróxido de hidrogénio 35% Perfect Bleach Office+ (VOCO, Cuxhaven, Germany); Grupo PO – gel peróxido de hidrogénio 6% Polaoffice+ (SDI, Dublin, Ireland); Grupo O – ozono gasoso O3med (Evozone, Reutlingen, Germany); Grupo PO+O - peróxido de hidrgénio 6% Polaoffice+ (SDI) e ozono O3med (Evozone). A avaliação de cor foi feita com um espectrofotómetro pelo sistema CIE-Lab, antes e depois dos protocolos de branqueamento. Foi feita uma análise comparativa de resultados utilizando os testes ANOVA Unidirecional e Tukey, através do programa SPSS.
Resultados: Após o branqueamento, todos os grupos apresentaram maior luminosidade (L* aumentado), sem diferenças significativas entre eles (p=0,9). Quanto às variáveis a* e b*, observou-se uma diminuição dos seus valores em todos os grupos, excepto no grupo O, cujo a* aumentou, não havendo no entanto, diferenças significativas entre eles a* p=0,05 e b* p=0,2. Analisando a variação de cor final, todos os grupos apresentaram um ΔE clinicamente percetível, excepto o grupo PO+O (ΔE=2,5), não havendo diferenças significativas entre os grupos (p=0,14).
Conclusão: Os grupos PB, peróxido de hidrogénio a 35% e o grupo O ozono , apresentaram uma eficácia branqueadora semelhante. Por outro lado, não se verificaram vantagens na associação de peróxido de hidrogénio a 6% com ozono. Tendo em conta a legislação europeia sobre os produtos de branqueamento com peróxido de hidrogénio e os efeitos adversos conhecidos, o ozono poderá constituir uma alternativa como método branqueador, igualmente eficaz e menos nocivo.
Objectives: The aim of this in vitro investigation was to evaluate and compare the bleaching efficacy of different teeth whitening agents with hydrogen peroxide at concentrations of 35% and 6%, and with ozone. Materials and Methods: 20 mesio-distaly sectioned molars were randomly assigned to 4 groups (n = 10), depending on the bleaching agent to be applied: Group PB - 35% hydrogen peroxide gel Perfect Bleach Office + (VOCO, Cuxhaven, Germany) ; group PO - 6% hydrogen peroxide gel Polaoffice + (SDI, Dublin, Ireland); Group O - O3med ozone gas (Evozone, Reutlingen, Germany); group PO + O - 6% Polaoffice + hydrogen peroxide (SDI) and O3med ozone (Evozone). Color assessment was performed with a CIE-Lab spectrophotometer before and after bleaching protocols. A comparative analysis of results was performed using the One-Way ANOVA and Tukey tests, using the SPSS software. Results: After bleaching, all groups presented higher brightness values (L* increased), without significant differences between them (p = 0.9). As for the variables a* and b*, their values decreased in all groups except for group O, where a* increased, but there were no significant differences between them, a* p = 0.05 and b* p = 0.2. Analyzing the final color variation, all groups presented a clinically perceptible ΔE, except the group PO + O (ΔE = 2.5), with no significant differences between the groups (p = 0.14). Conclusion: Groups PB, 35% hydrogen peroxide and O, ozone, showed similar bleaching efficiency. On the other hand, there were no advantages in combining 6% hydrogen peroxide with ozone. Given the European legislation on hydrogen peroxide bleaching products and the well known adverse effects, ozone could be an equally effective and less harmful alternative as a bleaching method.
Objectives: The aim of this in vitro investigation was to evaluate and compare the bleaching efficacy of different teeth whitening agents with hydrogen peroxide at concentrations of 35% and 6%, and with ozone. Materials and Methods: 20 mesio-distaly sectioned molars were randomly assigned to 4 groups (n = 10), depending on the bleaching agent to be applied: Group PB - 35% hydrogen peroxide gel Perfect Bleach Office + (VOCO, Cuxhaven, Germany) ; group PO - 6% hydrogen peroxide gel Polaoffice + (SDI, Dublin, Ireland); Group O - O3med ozone gas (Evozone, Reutlingen, Germany); group PO + O - 6% Polaoffice + hydrogen peroxide (SDI) and O3med ozone (Evozone). Color assessment was performed with a CIE-Lab spectrophotometer before and after bleaching protocols. A comparative analysis of results was performed using the One-Way ANOVA and Tukey tests, using the SPSS software. Results: After bleaching, all groups presented higher brightness values (L* increased), without significant differences between them (p = 0.9). As for the variables a* and b*, their values decreased in all groups except for group O, where a* increased, but there were no significant differences between them, a* p = 0.05 and b* p = 0.2. Analyzing the final color variation, all groups presented a clinically perceptible ΔE, except the group PO + O (ΔE = 2.5), with no significant differences between the groups (p = 0.14). Conclusion: Groups PB, 35% hydrogen peroxide and O, ozone, showed similar bleaching efficiency. On the other hand, there were no advantages in combining 6% hydrogen peroxide with ozone. Given the European legislation on hydrogen peroxide bleaching products and the well known adverse effects, ozone could be an equally effective and less harmful alternative as a bleaching method.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Branqueamento dentário Peróxido de hidrogénio Ozono Eficácia