Oda Y, Okabe T
Department of Dental Materials Science, Tokyo Dental College, Chiba, Japan.
Dent Mater. 1996 May;12(3):167-72. doi: 10.1016/s0109-5641(96)80016-9.
Finding an optimal soldering system for a titanium prosthesis has become increasingly important with the successful introduction of titanium and titanium alloys to dentistry. This study examined the effect of corrosion on the strength of the soldered joints of pure titanium and Ti-6Al-4V alloys joined using various solders.
Commercially pure titanium and Ti-6Al-4V alloy rods (2 mm in diameter; 25 mm long) were soldered in an argon atmosphere using four solders: two kinds of titanium-based solder, a gold-based solder, and a silver-based solder. Tensile strengths were examined before or after immersion treatments. Specimens were immersed in either a 0.9% NaCl or 1.0% lactic acid solution held at 35 degrees C for 3 and 8 wk. The amounts of various metal elements released were determined by atomic absorption photospectroscopy. The natural potentials and potentiodynamic polarization behavior of the soldered specimens in 0.9% NaCl or 1.0% lactic acid were determined by a computer-assisted corrosion measurement system. The results were analyzed by ANOVA and Student's t-test.
The cp-titanium and Ti-6Al-4V samples soldered with titanium-based solders exhibited tensile strengths of 300-400 MPa and were not significantly affected by immersion in either solution (no significant difference at p < 0.05). The strengths of both the cp-titanium and titanium alloy specimens soldered with gold-based solder were significantly lower than for any of the other specimens and were affected by immersion in the 0.9% NaCl solution (p < 0.01). The cp-titanium and Ti-6Al-4V specimens that were soldered with titanium-based solders did not show any transpassive regions or breakdown in the natural electrode potential range. On the contrary, the specimens soldered with gold-based and silver-based solders showed transpassive regions or breakdown potentials at less than 0 mV in 0.9% NaCl solution.
It is recommended that titanium-based solder be employed for titanium and titanium alloys.
随着钛及钛合金成功引入牙科领域，寻找一种适用于钛制假体的最佳焊接系统变得越发重要。本研究考察了使用不同焊料焊接的纯钛和Ti-6Al-4V合金焊接接头在腐蚀情况下的强度变化。
将商业纯钛和Ti-6Al-4V合金棒（直径2mm；长度25mm）在氩气氛围中使用四种焊料进行焊接：两种钛基焊料、一种金基焊料和一种银基焊料。在浸泡处理前后检测拉伸强度。将试样浸泡在35摄氏度的0.9%氯化钠溶液或1.0%乳酸溶液中3周和8周。通过原子吸收光谱法测定各种金属元素的释放量。使用计算机辅助腐蚀测量系统测定焊接试样在0.9%氯化钠溶液或1.0%乳酸溶液中的自然电位和动电位极化行为。结果采用方差分析和学生t检验进行分析。
用钛基焊料焊接的纯钛和Ti-6Al-4V样品的拉伸强度为300 - 400MPa，浸泡在任何一种溶液中均未受到显著影响（p < 0.05时无显著差异）。用金基焊料焊接的纯钛和钛合金试样的强度均显著低于其他任何试样，并受到浸泡在0.9%氯化钠溶液中的影响（p < 0.01）。用钛基焊料焊接的纯钛和Ti-6Al-4V试样在自然电极电位范围内未显示任何过钝化区域或击穿现象。相反，用金基和银基焊料焊接的试样在0.9%氯化钠溶液中显示出过钝化区域或击穿电位小于0mV。
建议钛及钛合金采用钛基焊料。
