Bond Strength of Gold Alloys Laser Welded to Cobalt-Chromium Alloy

Ikuya Watanabe1, *, Cameron Wallace2
1 Department of Biomaterials Science, Baylor College of Dentistry, Texas A&M Health Science Center, Dallas, TX, 75246 USA
2 Department of General Dentistry, Baylor College of Dentistry, Texas A&M Health Science Center, Dallas, TX, 75246 USA

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© Watanabe and Wallace; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Department of Biomaterials Science, Texas A&M Health Science Center, Baylor College of Dentistry, 3302 Gaston Ave., Dallas, TX 75246, USA; Tel: +1-214-370-7006; Fax: +1-214-370-7001; E-mail:


The objective of this study was to investigate the joint properties between cast gold alloys and Co-Cr alloy laser-welded by Nd:YAG laser. Cast plates were fabricated from three types of gold alloys (Type IV, Type II and low-gold) and a Co-Cr alloy. Each gold alloy was laser-welded to Co-Cr using a dental laser-welding machine. Homogeneously-welded and non-welded control specimens were also prepared. Tensile testing was conducted and data were statistically analyzed using ANOVA. The homogeneously-welded groups showed inferior fracture load compared to corresponding control groups, except for Co-Cr. In the specimens welded heterogeneously to Co-Cr, Type IV was the greatest, followed by low-gold and Type II. There was no statistical difference (P<0.05) in fracture load between Type II control and that welded to Co-Cr. Higher elongations were obtained for Type II in all conditions, whereas the lowest elongation occurred for low-gold welded to Co-Cr. This study indicated that, of the three gold alloys tested, the Type IV gold alloy was the most suitable alloy for laser-welding to Co-Cr.

Key Words: gold alloys, cobalt chromium alloy, laser welding, bond strength.