SURFACE TREATMENT TYPE AND UNION RESISTANCE BETWEEN FIBERGLASS POSTS AND COMPOSITE RESIN

Abstract

Objective: The objective of this work was to evaluate the influence of different methods of surface treatment on glass fiber posts with respect to their bond strength with the composite resin. Method: Twenty-four pre-fabricated posts were randomly divided into three groups (n= 8) according to the chosen surface treatment. Control Group- surface treatment with 37% phosphoric acid etching and silanization. Group 2 - conditioned with 10% fluoridric acid and silanization. Group 3 - sandblasting for 10 seconds and silanization. The specimens were obtained using the stainless steel matrix made for this study and were maintained in absolute humidity at 37 ° C for 48 hours and then subjected to the PUSH-OUT test on the test machine. Results: The results showed that the aluminium oxide blasting treatment of aluminum and silane (12.24 MPa) (G3) had statistically significant difference when compared to the treatment of hydrofluoric acid and silane (G2) (8.03 MPa) (p <0, 05). The predominant fracture type was cohesive of the composite resin (68.75%) and only a mixed fracture (2.08%) was observed. Conclusions: Thus, it is concluded that the blasting treatment of aluminum oxide and silane can be used as a surface treatment on the glass fiber post.