Chaves M, Vermilyea S G, Papazoglou E, Brantley W A
College of Dentistry, Ohio State University, Columbus, USA.
J Prosthet Dent. 1998 Jun;79(6):677-84. doi: 10.1016/s0022-3913(98)70075-7.
Little information is available on the optimum technique for soldering high-palladium alloys, which have gained considerable popularity for prosthodontic applications.
The objective of this study was to compare the flexural stress at the proportional limit of four noble dental alloy specimens soldered with torch, oven, and infrared-techniques.
The high-palladium alloys studied were Legacy XT (Jelenko), Freedom Plus (Jelenko), and IS 85 (Williams/Ivoclar). A gold-palladium alloy, Olympia (Jelenko), served as the control. Thirty round bars, 18 x 3 mm, were cast from each alloy, cut in half, aligned, and joined using Olympia Pre solder (Jelenko) for the gas-oxygen torch and the infrared technique and Alboro LF solder (Jelenko) for the oven technique. Each soldered bar was subjected to three-point bending, and the maximum elastic stress or strength of the solder joint was calculated at the proportional limit. Data were analyzed by two-way ANOVA and the Ryan-Einot-Gabriel-Welsch (REGW) multiple range test at the 0.05 level of significance.
There was no significant difference between torch and oven-soldering, but both were significantly different from the infrared technique. ANOVA showed a significant difference between alloys, but this difference could not be detected with the REGW test. SEM examination of the fracture surfaces revealed grooves associated with the path of crack propagation. X-ray energy-dispersive spectroscopic analysis failed to detect copper in the solders, and there were no significant changes in the solder compositions after the melting procedures.
All three techniques can yield satisfactory solder joints in high-palladium alloys. These joints should be well-polished to achieve optimal strength.
对于高钯合金焊接的最佳技术，目前可获得的信息很少，而高钯合金在口腔修复应用中已颇受欢迎。
本研究的目的是比较用火焰、炉内和红外技术焊接的四种牙科贵金属合金试样在比例极限下的弯曲应力。
所研究的高钯合金有Legacy XT（杰连科公司）、Freedom Plus（杰连科公司）和IS 85（威廉姆斯/义获嘉公司）。一种金钯合金Olympia（杰连科公司）用作对照。从每种合金铸造30根18×3毫米的圆棒，切成两半，对齐，对于火焰技术和红外技术使用Olympia预焊料（杰连科公司），对于炉内技术使用Alboro LF焊料（杰连科公司）进行连接。对每个焊接棒进行三点弯曲，并在比例极限处计算焊点的最大弹性应力或强度。数据采用双向方差分析和显著性水平为0.05的Ryan-Einot-Gabriel-Welsch（REGW）多重极差检验进行分析。
火焰焊接和炉内焊接之间无显著差异，但二者与红外技术均有显著差异。方差分析显示合金之间存在显著差异，但REGW检验未检测到这种差异。对断裂表面的扫描电子显微镜检查显示出与裂纹扩展路径相关的凹槽。X射线能量色散光谱分析未能在焊料中检测到铜，并且在熔化过程后焊料成分没有显著变化。
所有这三种技术都能在高钯合金中产生令人满意的焊点。这些焊点应进行良好抛光以获得最佳强度。
