Efeito de diferentes métodos mecânicos de limpeza da dentina radicular na resistência de união adesiva de pinos de fibra de vidro

Abstract

The aim of the study was to verify the bond strength through the push-out test using mechanical techniques of 17% EDTA addition to improve the removal of filling materials and smear layer from the prepared space. Bovine teeth (n = 50) were randomly divided into 5 groups: Control (CTRL), Manual (MAN), Conduit Brush (ESCO), EasyClean (EASY) and Passive Ultrasonic Irrigation (PUI), each tooth modeled, filled and preparation to receive the intra-radicular retainer was performed, where we approached the techniques for using the instrument in each group. With the seal cemented, cuts were made in three thirds and the push-out test was performed to verify the breaking strength. The cervical, middle and apical thirds had the highest adhesive bond strength respectively (p <0.001). The EASY and ESCO groups showed better results from the interaction between thirds and the mechanical methods used (p <0.001). The use of Easyclean and Flue Brush in the preparation with 17% EDTA in the flue space brought satisfactory results for the retainer-dentin bond, providing greater bond strength during the push-out test.