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首页> 外文期刊>The Journal of Prosthetic Dentistry >Laser welding of a cobalt-chromium removable partial denture alloy.
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Laser welding of a cobalt-chromium removable partial denture alloy.

机译：钴铬可摘局部义齿合金的激光焊接。

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STATEMENT OF PROBLEM: The electric alloy brazed joints of removable partial denture alloys have failed frequently after routine usage. PURPOSE: A technique providing higher joint strengths was investigated. This investigation compared the tensile strengths of electric-brazed and laser-welded joints for a cobalt-chromium removable partial denture alloy. MATERIAL AND METHODS: Twenty-four cobalt-chromium standard tensile testing rods were prepared and divided into three groups of eight. All specimens in the control group (group 1) were left in the as-cast condition. Groups 2 and 3 were the test specimens, which were sectioned at the center of the rod. Eight specimens were joined by using electric brazing, and the remaining specimens were joined by using laser welding. After joining, each joint was ground to a uniform diameter, then tested to tensile failure on an Instron universal testing machine. Failure loads were recorded and fracture stress calculated. Statistical analysis was applied. RESULTS: The student-Newman-Keuls test showed a highly significant difference between the joint strengths of the as-cast control specimens, the electric-brazed and laser-welded joints. CONCLUSIONS: The tensile strengths of the as-cast joints were higher than those for the laser-welded joints, and both were higher than the electric-brazed joint strengths.
机译：问题陈述：常规使用后，可摘局部义齿合金的电合金钎焊接头经常失效。目的：研究了一种提供更高接合强度的技术。这项研究比较了钴铬合金可摘局部义齿合金的电钎焊和激光焊接接头的抗拉强度。材料与方法：制备二十四根钴铬标准拉伸试验棒，分为三组，每组八组。对照组（第1组）中的所有标本均保持原样。第2组和第3组为测试样品，在棒的中央切开。通过电钎焊将八个样品连接起来，将其余的样品通过激光焊接连接起来。连接后，将每个接头磨成均匀的直径，然后在Instron万能试验机上进行拉伸破坏测试。记录破坏载荷并计算断裂应力。应用统计分析。结果：Student-Newman-Keuls测试表明，铸态控制样品，电钎焊和激光焊接接头的接头强度之间存在非常显着的差异。结论：铸态接头的抗拉强度高于激光焊接接头的抗拉强度，且均高于电钎焊接头的强度。

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