EFEITO DA APLICAÇÃO SÔNICA DE SISTEMAS ADESIVOS NA ADESÃO DE PINOS DE FIBRA DE VIDRO AO CANAL RADICULAR

Abstract

Bonding adhesive systems and luting agents material inside the root canal is still a challenge in luting posts. This study evaluated the effects of applying three bonding agents using a vibrating sonic device on the push-out bond strength (BS) and nanolakage (NI) pattern, when these products were applied in the etch-and-rinse mode to bond fiber post to the root canal. Fifty-four roots of human premolars were endodontically prepared and divided into 6 groups according to combination of the main factors: products (Ambar Universal / AllCem, Single Bond Universal / RelyX ARC, Prime & Bond Elect / Enforce) and application mode (manual or sonic). The fiber posts were cemented and sectioned transversally into six 1-mm thick serial slices, which were subjected to a push-out bond strength test at 0.5 mm/min. In addition, two roots (n=2) were subjected to NI analysis using scanning electron microscopy after immersion of slices in silver nitrate. The data were analyzed by 2-way ANOVA and Bonferroni's post-hoc test (α=5%). Sonic application increased BS significantly only on the coronal third in the Ambar Universal group. When Single Bond Universal was used, higher BS values were observed when the bonding agent was manually applied in comparison to those when the sonic device was used. For Prime & Bond Elect, no significant difference in BS values was noted when the application methods were compared. Manual application also produced lower NI values than sonic application when Ambar Universal was used, while no significant difference in NI was noted when the other adhesive systems were used. The sonic application did not improve the bond strength of posts to root canal in comparison to manual application.