The effect of metal surface treatment before reporcelainization for ceramic repair after adhesive fracture of ceramo-metallic restoration

Received 20 August 2014 Accepted 17 November 2014 Abstract The high cost of the precious metals has simulated interest in less expensive alloys for the casting of Crown & Bridge. Several non precious metal alloys based on Nickel and/or Cobalt Chromium alloys have become commercially available for the use with fusing porcelain (ceramic). The purpose of the present work was two folds: 1To investigate the effect of different metal surface treatment (sandblasting, grinding and grinding followed by sandblasting) before reprocelainization (reapplication of porcelain after adhesive fracture) of the bare metal on the bond strength. 2To give some light on the mechanism of metal ceramic bonding through the use of metallographic microscopic study. Two non-precious dental casting alloys NickelChromium and CobaltChromium alloys and one type of dental ceramic were used in this study. The conclusions from the study weresandblasting increases the bond strength of metal/ceramic interface for both the investigated alloys, and the CobaltChromium alloy showed better bond strength with sandblasting than the NickelChromium.