Influence of dental erosion on shear bond strength of ceramic brackets bonded with two different adhesive systems: an in vitro study
DOI:
https://doi.org/10.14393/BJ-v37n0a2021-56246Palavras-chave:
Tooth erosion, Ceramics, Orthodontic brackets, Orthodontic adhesive.Resumo
Este estudo teve como objetivo avaliar a resistência ao cisalhamento de braquetes cerâmicos colados em esmalte hígido e erodido utilizando dois diferentes sistemas adesivos. Setenta e dois incisivos centrais bovinos foram divididos em quatro grupos, definidos por dois fatores: condição do esmalte (grupo controle, mantido em saliva artificial; e grupo experimental, submetido ao desafio erosivo pela imersão em Coca-cola® por 90 segundos, a cada seis horas, durante cinco dias) e tipo de sistema adesivo (Transbond® XT ou Transbond® Plus Color Change). Braquetes cerâmicos policristalinos foram colados às coroas dos dentes bovinos hígidos e erodidos, seguindo as recomendações dos fabricantes de cada material e utilizando o mesmo protocolo de polimerização. As variáveis de resposta foram resistência ao cisalhamento e índice de remanescente adesivo (IRA). Os dados de resistência ao cisalhamento foram analisados utilizando ANOVA dois critérios, seguido pelo teste de Tukey. Os valores do IRA foram analisados por meio do teste Kruskal-Wallis seguido pelo teste de comparação de Dunn (α=0,05) e seus percentuais entre os grupos foram comparados pelo teste exato de Fisher. O coeficiente de correlação de Spearman foi aplicado para avaliar a correlação entre os valores do IRA e da resistência ao cisalhamento. Os resultados mostraram que apenas o sistema adesivo teve influência significativa na resistência ao cisalhamento (p=0,014), sendo que o Transbond® Plus Color Change apresentou valores mais elevados. Não houve diferença significativa relacionada à condição do esmalte (p=0.665) ou à interação entre o sistema adesivo e a condição do esmalte (p=0,055). Houve diferença quanto aos percentuais dos valores do IRA (p<0,001) e seus valores médios também apresentaram diferença estatisticamente significante na maioria das comparações entre os grupos. Contudo, nenhuma correlação significativa foi encontrada entre os valores do IRA e da resistência ao cisalhamento. Assim, conclui-se que o tipo de sistema adesivo afetou a resistência ao cisalhamento de braquetes cerâmicos colados ao esmalte dentário, mas a condição do esmalte, se hígido ou erodido, não demonstrou influência significativa. Não houve correlação entre os valores do IRA e da resistência ao cisalhamento, embora tenha havido tendência de maior retenção do adesivo, após a remoção do braquete, ao esmalte erodido.
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Copyright (c) 2021 Laerte Ribeiro Menezes-Júnior, Marcos Alan Vieira Bittencourt, Andomar Bruno Fernandes Vilela, Carlos José Soares, Diego Figueiredo Nóbrega, Renata Marques de Melo Marinho, Sigmar de Mello Rode, Flávia Pardo Salata Nahsan, Luiz Renato Paranhos
Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.
