Dentistry

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

15^th Euro Congress on Dental & Oral Health

October 24-26, 2016 Rome, Italy

Suhayla Reda Albanai

King Saud University, Riyadh,Saudi Arabia

Posters & Accepted Abstracts: Dentistry

Abstract:

Aim: 1) Testing of bond strength: (Using a universal testing machine) to investigate the effect of metal surface treatment (sandblasting, grinding and grinding followed by sandblasting) before repocelainization of the bare metal on the bond strength. 2) Metallographic microscopic study :( using metallographical microscope) to give some light on the mechanism of metal ceramic bonding. Material and Methods: Two non-precious dental casting alloys, a nickel-chromium and a cobalt-chromium alloys, and one type of dental ceramic, were commonly used were used. A total of 80 rod shaped metallic samples, 40 samples for each alloy, were used for bond strength measurements and for metallographic study. Results: Bond strength evaluation test: Co-Cr alloy exhibited the highest mean bonding value followed by Ni-Cr. For Ni-Cr alloy the highest mean bond strength was obtained when the bare metal was treated with sandblasting. For Co-Cr alloy, the highest mean bond strength was obtained when the bare metal was treated with sandblasting and when it was treated with grinding with P120D silicon carbide emery paper. CONCLUSIONS: 1) It is possible to repair the metal/porcelain restoration interface after adhesive fracture 2) Direct reporcelainization (without metal surface treatment) on the bare metal also gives adequate bond strength.3) Sandblasting increases the bond strength of metal/porcelain interface for both the investigated alloys, namely Ni-Cr and Co-Cr.4) The cobalt-chromium alloy shows better bond strength with sandblasting than the nickel-chromium alloy.5) Grinding procedure should not be used as a metal surface treatment before reporcelainization because it lowers the bond strength in case of base metal alloys.

Biography :

Email: salbanai@hamad.qa