Shear bond strength of metal/ceramic interface after different surface treattments: an in vitro study

Abstract

The aim of this in vitro study was to verify, by means of the shear test, the bonding strength of Wironia® light nickel-chrome alloy without beryllium, subjected to different surface treatments, to Vita VM13 and Noritake ceramics. Eighty cylindrical metal specimens were manufactured with aid from a steel matrix, measuring 4 mm in diameter by 4 mm height. The specimens were divided into eight groups (n=10), according to surface treatment applied to the metal alloy and type of ceramic tested. These were evaluated in accordance with shear strength criteria and, with the aid of optic microscopy the remained ceramic area adhered to metal after fracturing was evaluated. Specimens of G6 (manufactured with Noritake Ceramic treated with airborne particle abrasion-26.401 ± 11.637 MPa) presented the highest shear bond strength (p> 0,05), whereas the lowest values were recorded for G4 (the Vita Ceramic specimens bur treated -13,440 ± 7,766 MPa). G6 (19425,4 μm2) presented the biggest ceramic area adhered to metal (p> 0,05), whereas G4 (2310,2 μm2) presented the small area. In conclusion, G6 had the highest values for shear bond strength and metal adhere to surface, whereas G4 had the lowest values. Descriptor: Metal-ceramic restorations, nickel-chrome alloys, dental porcelain.