Watanabe Ikuya, Wallace Cameron
Department of Biomaterials Science, Baylor College of Dentistry, Texas A&M Health Science Center, Dallas, TX, 75246 USA.
Open Dent J. 2008;2:109-13. doi: 10.2174/1874210600802010109. Epub 2008 Nov 7.
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.
本研究的目的是调查用钕钇铝石榴石激光对铸造金合金与钴铬合金进行激光焊接后的接头性能。用三种类型的金合金（IV型、II型和低金合金）以及一种钴铬合金制作铸造板。使用牙科激光焊接机将每种金合金与钴铬合金进行激光焊接。还制备了均匀焊接和未焊接的对照样本。进行拉伸试验，并使用方差分析对数据进行统计分析。除了钴铬合金外，均匀焊接组的断裂载荷低于相应的对照组。在与钴铬合金进行非均匀焊接的样本中，IV型的断裂载荷最大，其次是低金合金和II型。II型对照组与焊接到钴铬合金上的样本之间的断裂载荷没有统计学差异（P<0.05）。在所有条件下，II型的伸长率更高，而低金合金焊接到钴铬合金上时伸长率最低。本研究表明，在所测试的三种金合金中，IV型金合金是最适合与钴铬合金进行激光焊接的合金。
