Influência da adição de carga inorgânica aos sistemas adesivos na resistência adesiva à dentina
Abstract
O objetivo desse estudo foi avaliar o papel da presença ou não de partículas de carga nos sistemas adesivos sobre a resistência adesiva à dentina. Foram utilizados 70 dentes bovinos, divididos em 7 grupos, que foram embutidos em resina acrílica e desgastados até a exposição de uma área plana de dentina. Todos os espécimes receberam o condicionamento ácido e aplicação dos sistemas adesivos, contendo ou não as partículas de carga, de acordo com as instruções do fabricante: Prime & Bond 2.1 (sem carga – SC), Prime & Bond NT (com carga – CC), Prime & Bond 2.1 + 10% de SiO2 (CC), One Step (SC), One Step Plus (CC), Sigle Bond (SC) e Single Bond +10% de SiO2 (CC). Cilindros de resina composta TPH Spectrum foram realizados sobre a área de adesão. Os espécimes foram armazenados por 24 a 37C°, e então submetidos ao teste de cisalhamento. Os dados obtidos foram submetidos à análise estatística, empregando- se o teste de análise de variância paramétrica, seguida pelo teste de Tukey a um nível de significância de 5%. Concluiu-se que, para todos os sistemas adesivos testados, a adição de partículas de carga não resultou em diferenças significativas na força de adesão. Porém, entre as marcas comerciais, observamos diferenças significativas, o que demonstra a influência dos demais componentes na eficiência adesiva.
UNITERMOS: adesivos dentinários; cisalhamento; carga.
SUMMARY
The aim of this study was to evaluate the role of the presence or not of filler particles on adhesive systems over the dentin bond strength. Seventy bovine teeth were used, divided in seven groups that were fitted in acrylic resin then worn out until a plane area of dentin was exposed. All specimens were acid etched and received the adhesive systems, containing or not filler particles, according the manufacture’s instructions: Prime & Bond 2.1 (whithout filler – WOF), Prime & Bond NT (with filler – WF), Prime & Bond 2.1 + 10% of SiO2 (WF), One Step (WOF), One Step Plus (WF), Single Bond (WOF), and Single Bond + 10 % of SiO2 (WF). The specimens were stored at 37°C, for 24h and then taken to a shear test. The obtained data was submited to statistical analysis using the ANOVA test and Tukey’s tests at a significance level of 5%. In conclusion, for all tested adhesive systems, the filler particles did not result in significant differences to bond strength. However, among commercial brands we observed significant differences, which demonstrates the influence on other components on adhesive efficiency.
UNITERMS: dentin-bonding agents; shear strength; filler.
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