Avaliação da união de dois sistemas adesivos ao esmalte dental expostos a dentifrícios clareadores
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Data
2009-09-20
Autores
Tolentino, Patricia Ramos [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Cremes dentais contendo peróxido de carbamida ou de hidrogênio tem sido empregados como coadjuvantes na obtenção de dentes mais claros. No entanto, estes materiais são utilizados sem a orientação e o acompanhamento do profissional, fato que tem causado preocupação, principalmente pela maior abrasividade, rugosidade e desgaste que proporcionam, bem como pelos possíveis danos à união dos materiais restauradores à estrutura exposta a estes cremes. O objetivo deste trabalho foi avaliar, pelo método de microcisalhamento, a resistência adesiva obtida em restaurações de resina composta realizadas sobre o esmalte dental previamente exposto a diferentes dentifrícios. Para isso, fragmentos dentais bovinos foram polidos, expostos a cremes contendo peróxido de hidrogênio, peróxido de carbamida ou a um dentifrício convencional e, finalmente, foram restaurados empregando diferentes sistemas adesivos e resina composta. Na seqüência, os fragmentos restaurados foram submetidos ao teste de microcisalhamento, análise do padrão de fratura e os resultados obtidos foram submetidos a análise de variância e teste de Tukey ao nível de 0,5%. Analisando os resultados não houve diferença estatística entre os adesivos estudados, porém entre os tratamentos, houve diferença estatisticamente significante entre os grupos controle x carbamida (p=0.0145) e controle x hidrogênio (p=0.0370), independente do adesivo utilizado. Os resultados obtidos mostraram que houve uma pequena redução na adesividade quando se utilizou dentifrícios contendo peróxidos. O grupo controle obteve valores de resistência ao microcisalhamento maiores quando comparado aos grupos que utilizaram dentifrícios contendo peróxidos, independente do adesivo utilizado. Na avaliação do tipo de fratura houve predominância de falhas adesivas, que pode ser explicado devido sua pequena espessura e sensibilidade á técnica.
Toothpastes containing carbamide peroxide or hydrogen has been used as adjuvants to obtain teeth bleaching. However, these materials are used without the guidance and monitoring of professional, a fact that has caused concern, especially for the most abrasive, roughness and wear they provide, as well as the possible damage to the union of restorative materials exposed to the structure of these creams. The objective of this study was to evaluate the method of microshear, the bond strength achieved in composite resin restorations performed on the enamel previously exposed to different dentifrices. For this, dental fragments were polished cattle exposed to creams containing hydrogen peroxide, carbamide peroxide or a dentifrice, and finally were restored using adhesive systems and composite resin. Subsequently, the slurries were tested for microshear, analysis of the fracture pattern and the results were analyzed by ANOVA and Tukey test at 0.5%. Looking at the results there was no statistical difference between adhesives studied, but among the treatments showed a statistically significant difference between the control group x carbamide (p = 0.0145) and between the control group x hydrogen (p = 0.0370), regardless of adhesive used. The results showed that there was a small reduction in adhesion when using toothpastes containing peroxide. The control group had values of resistance microshear higher when compared to groups using toothpastes containing peroxide, regardless of adhesive used. In assessing the type of fracture was predominantly adhesive failures, which can be explained by its thinness and sensitivity to the technique.
Toothpastes containing carbamide peroxide or hydrogen has been used as adjuvants to obtain teeth bleaching. However, these materials are used without the guidance and monitoring of professional, a fact that has caused concern, especially for the most abrasive, roughness and wear they provide, as well as the possible damage to the union of restorative materials exposed to the structure of these creams. The objective of this study was to evaluate the method of microshear, the bond strength achieved in composite resin restorations performed on the enamel previously exposed to different dentifrices. For this, dental fragments were polished cattle exposed to creams containing hydrogen peroxide, carbamide peroxide or a dentifrice, and finally were restored using adhesive systems and composite resin. Subsequently, the slurries were tested for microshear, analysis of the fracture pattern and the results were analyzed by ANOVA and Tukey test at 0.5%. Looking at the results there was no statistical difference between adhesives studied, but among the treatments showed a statistically significant difference between the control group x carbamide (p = 0.0145) and between the control group x hydrogen (p = 0.0370), regardless of adhesive used. The results showed that there was a small reduction in adhesion when using toothpastes containing peroxide. The control group had values of resistance microshear higher when compared to groups using toothpastes containing peroxide, regardless of adhesive used. In assessing the type of fracture was predominantly adhesive failures, which can be explained by its thinness and sensitivity to the technique.
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Palavras-chave
Dentifrícios, Adesivos dentinários, Clareamento dental, Esmalte dentário, Dentifrices