SEM/EDS evaluation of porcelain adherence to gold‐coated cast titanium
- 11 December 2003
- journal article
- research article
- Published by Wiley in Journal of Biomedical Materials Research Part B: Applied Biomaterials
- Vol. 68B (2), 165-173
- https://doi.org/10.1002/jbm.b.20017
Abstract
The adhesion between titanium and dental porcelain is related to the diffusion of oxygen to the reaction layer formed on cast-titanium surfaces during porcelain firing. The diffusion of oxygen could be suppressed by coating the titanium surface with a thin gold layer. This study characterized the effects of gold coating on titanium–ceramic adhesion. ASTM grade II CP titanium was cast into a MgO-based investment (Selevest CB, Selec). The specimen surfaces were air abraded with 110-μm Al2O3 particles. Gold coating was applied on titanium surfaces by three methods: gold-paste (Deck Gold NF, Degussa-Ney) coating and firing at 800 °C for three times, single gold-paste coating and firing followed by sputter coating (40 mA, 500 s), and sputter coating (40 mA, 1000 s). Surfaces only air abraded with Al2O3 particles were used as controls. An ultra-low-fusing dental porcelain (Vita Titankeramik, Vident) was fused on titanium surfaces. Specimen surfaces were characterized by SEM/EDS and XRD. The titanium–ceramic adhesion was evaluated by a biaxial flexure test (N = 8), and area fraction of adherent porcelain (AFAP) was determined by EDS. Numerical results were statistically analyzed by one-way ANOVA and the Student-Newman-Keuls test at α = 0.05. SEM fractography showed a substantial amount of porcelains remaining on the gold-sputter-coated titanium surfaces. A new Au2Ti phase was found on gold-coated titanium surface after the firing. Significantly higher (p < .05) AFAP values were determined for the gold-sputter-coated specimens compared to the others. No significant differences were found among the other groups and the control. Results suggested that gold coatings used in this study are not effective barriers to completely protect titanium from oxidation during the porcelain firing, and porcelain adherence to cast titanium can be improved by gold-sputter coating used in the present study. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 68B: 165–173, 2004Keywords
This publication has 27 references indexed in Scilit:
- Concise Review Biomaterials & Bioengineering: Fusing of Dental Ceramics to TitaniumJournal of Dental Research, 2001
- Improvement of Bond Strength in Metal-Ceramic Systems Using a Gold Intermediate Layer.Dental Materials Journal, 1998
- Dentists' opinions on aspects of cast titanium restorationsJournal of Dentistry, 1997
- Metal-ceramic bond strengthActa Odontologica Scandinavica, 1996
- Bonding of low‐fusing dental porcelain to commercially pure titaniumJournal of Biomedical Materials Research, 1994
- Porcelain bonding on Ti: Its dependence on surface roughness, firing time and vacuum levelSurface and Interface Analysis, 1993
- Effect of interfacial variables on metal‐porcelain bondingJournal of Biomedical Materials Research, 1993
- Titanium Endosseous Implant‐Soft Tissue Interface: A Literature ReviewThe Journal of Periodontology, 1991
- Oxide Adherence and Porcelain Bonding to Titanium and Ti-6A1-4V AlloyJournal of Dental Research, 1990
- An X-ray Spectrometric Technique for Measuring Porcelain-Metal AdherenceJournal of Dental Research, 1983