INFLUÊNCIA DA APLICAÇÃO ULTRASSÔNICA EM DIFERENTES SISTEMAS ADESIVOS NA ADESÃO DE PINOS DE FIBRA DE VIDRO AO CANAL RADICULAR

Abstract

The aim of this study was evaluate the influence of the aplication mode of adhesive systems on the push-out bond strenght (POBS), silver nitrate uptake (SNU) and in situ degree of conversion (ISDC) on the hibrid layer after cementation luted posts.The roots of 66 human premolars were prepared and divided in six groups (n=11), according to the following combination: application mode (manual passive, manual active and ultrassonic vibration) and etch and rinse and self-etch adhesive systems (Adper Single Bond 2 and Single Bond Universal). The posts were cemented in accordance with the manufacturer’s instructions of each cementation system. After one week of water storage, the roots were seccioned transversely into six slabs and were tasted in POBS (0.5mm/min). Two roots for group were data immersed in 50% silver nitrate, photo-developed and analyzed by SEM to measure the SNU. Two roots for group were evaluated by micro-Raman spectroscopy to measure ISDC. The data were analyzed by 3-way repeated measures ANOVA and Tukey´s tests (5%). With the results obtained, it was observed: bond strength increased with the use of active application (manual and ultrasonic) of the adhesive. Using adhesive system Adper Single Bond the nitrate leakage values increase but with ultrasound prototype the nitrate leakage values reduce in relation active application. In ISDC a significant increase in the cervical and middle thirds with active application was observed and all thirds using ultrasound prototype, the passive application using Single Bond Universal adhesive showed worse results.