Influencia del tiempo de tratamiento de superficie con ácido fluorhídrico de la porcelana VITA VM 13 en la resistencia de unión a cemento de resina frente a fuerzas de tracción: Estudio in vitro

aim: indirect restorative procedures are common in the current daily practice. special care must be taken in the cement, as the vast majority of failures occurs at the interface tooth /restoration. therefore a proper surface treatment of the restoration is essential to achieve optimum adhesion to the tooth surface. materials and methods: thirty porcelain cylinders vita vm 13 with dimensions of 5 mm in height and 7 mm in diameter were randomly divided into 3 groups (n=10) according to the treatments received. group i (control) - no surface conditioning; group ii- recorded with 9.6% hydrofluoric acid for 1 minute; group iii - recorded with 9.6% hydrofluoric acid for 2 minutes. their tensile bond strength was tested in a universal testing machine (instron model 4411, 3m). the values, expressed in mpa, were statistically analyzed at a level of significance of 5%, using analysis of variance (anova) of a factor. results: in relation to the bond strength test, tensile strength, revealed the following values for each group: group i (control) - x=3.35 mpa, group ii - x=4.64 mpa, group iii - x=3.80 mpa. conclusions: according to the results, it can be concluded that the surface treatment with hydrofluoric acid for 1 minute promotes microretentions, which significantly increase the values of bond strength, tensile strength. this can result in a higher clinical benefit.