ABSTRACT The purpose of the study was to investigate the influence of flame and furnace soldering methods on the stress corrosion, fatigue resistance and fracture toughness of a ‘Dolder’ bar soldered to a non-oxidising gold cylinder using a gold solder. Two bars were soldered to opposite sides of a cylinder using the two techniques. Fatigue cycling one side of the bars was undertaken, with one group in a wet corrosive environment and the other in air. Force displacement load-unload curves was established to 100 N as a base line, thereafter, every 1000 cycles to 100 N load for 10,000 cycles. The system compliance and energy loss (mJ), was calculated. The critical stress intensity factor, K1c, of the solder/cylinder interface was established using a single-edge-notched-beam test. Mode of failure was evaluated using SEM. No corrosion was observed in the wet environment. Both soldering methods produced a thin brittle diffusion layer within the surface of the cylinder. The K1c of this layer was similar to that of a brittle ceramic. No embrittling reaction occurred at the solder/bar junction. This interfacial reaction has clinical relevance for soldered bar attachment systems using non-oxidising cylinders.

中文翻译：

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火焰和炉焊方法对种植体覆盖义齿焊条连接系统应力腐蚀、抗疲劳和断裂韧性的影响

摘要 本研究的目的是研究火焰和熔炉焊接方法对使用金焊料焊接到非氧化金圆柱体的“Dolder”棒的应力腐蚀、抗疲劳性和断裂韧性的影响。使用这两种技术将两根棒焊接到圆柱体的两侧。对杆的一侧进行疲劳循环，一组在潮湿的腐蚀环境中，另一组在空气中。力位移加载-卸载曲线以 100 N 为基线建立，此后每 1000 次循环到 100 N 加载 10,000 次循环。计算系统顺应性和能量损失 (mJ)。焊料/圆柱体界面的临界应力强度因子 K1c 是使用单边缺口梁测试确定的。使用SEM评估失效模式。在潮湿环境中未观察到腐蚀。两种焊接方法都会在圆柱体表面产生一层薄而脆的扩散层。该层的 K1c 类似于脆性陶瓷的 K1c。在焊料/条连接处没有发生脆化反应。这种界面反应对于使用非氧化气缸的焊条连接系统具有临床意义。