Influência do uso do hipoclorito de cálcio na força de adesão imediata / mediata de cimento autoadesivo ao sustrato dentinário coronário e radicular

Abstract

This study evaluated the effect of different solutions for deproteinization of dentin organic matrix in the bond strength of self-adhesive cement to dentin, immediate and long-term. Using 40 human third molars divided into 4 groups. G1MT- (control) without surface treatment. G2MTcontrol (+) 37% phosphoric acid for 20 sec. G3MT- treatment with NaOCl 10% for 30 seconds. G4MT- treatment CaOCl 10% for 30 seconds. All teeth received a restoration in composite resin (3mm high) cemented with U200. After restoration, the crowns were sectioned to obtain sticks of 1 mm2 area and submitted to microtensile test (MT). For the test push out (PO) 40 human maxillary incisors were used. The teeth were divided into groups according to treatment (G5Po, G6Po, G7Po and G8Po) described previously. After the filling of the U200 with the roots were sectioned to obtain 1 mm thick dentin disks which were subjected to the test. Two teeth of each group were stored in distilled water at 37 for 6 months. The values obtained in the MT and OP tests were expressed in MPa and statistically analyzed by ANOVA factor 1 (p <0.05). Conducted evaluation of the fracture pattern by light and electron microscopy is that the failures were classified as adhesive, mixed and cohesive. MT values showed no downward trend as the PO, the treatment with hypochlorite did not affect the bond strength. Key Words: deproteinization, calcium hypochlorite, self-adhesive cement