Yoshinari Masao, Uzawa Shinobu, Komiyama Yataro
Oral Health Science Center, Tokyo Dental College, 2-9-18 Misaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan.
Reality Dental Laboratory, 2-3-22 Kudanminami, Chiyoda-ku, Tokyo 102-0072, Japan.
J Prosthodont Res. 2016 Oct;60(4):274-281. doi: 10.1016/j.jpor.2016.01.007. Epub 2016 Feb 11.
The aim of this in vitro study was to evaluate tensile bond strengths and corrosion resistance of CoCr alloys joined with gold cylinder by a soldering system in comparison with the conventional cast-joining system.
CoCr alloys joined with gold cylinder by a soldering system using a high-fusing gold solder (CoCr/Solder/Gold cylinder), gold alloy joined with gold cylinder by a cast joining system (Gold alloy/Gold cylinder) and CoCr castings were fabricated. The tensile bond strength and corrosion resistance in 0.9% NaCl solution (pH 7.4 and pH 2.3) were evaluated. Scanning electron microscopy (SEM) of the fractured surface and electron probe microanalysis (EPMA) of the joined interfaces were also performed.
The tensile bond strengths of the CoCr/Solder/Gold cylinder specimens showed similar values as the Gold alloy/Gold cylinder specimens. SEM observation and EPMA analyses suggested firm bonding between the CoCr alloy and gold cylinder. The released elements from the CoCr/Solder/Gold cylinder specimens were similar to ones from CoCr castings.
Results showed that superstructures made of CoCr alloys joined with the gold cylinder using a high-fusing gold solder had sufficient bond strength and high corrosion resistance. These hybrid frameworks with cobalt-chromium alloy and gold cylinder are promising prosthesis for implant superstructures with the low cost and favorable mechanical properties instead of conventional high-gold alloys.
本体外研究旨在评估通过焊接系统连接钴铬合金与金圆柱体的拉伸粘结强度和耐腐蚀性，并与传统铸造连接系统进行比较。
使用高熔金焊料通过焊接系统制备钴铬合金与金圆柱体连接的试件（钴铬合金/焊料/金圆柱体）、通过铸造连接系统制备金合金与金圆柱体连接的试件（金合金/金圆柱体）以及钴铬铸件。评估在0.9%氯化钠溶液（pH 7.4和pH 2.3）中的拉伸粘结强度和耐腐蚀性。还对断裂表面进行扫描电子显微镜（SEM）观察以及对连接界面进行电子探针微分析（EPMA）。
钴铬合金/焊料/金圆柱体试件的拉伸粘结强度与金合金/金圆柱体试件的值相似。SEM观察和EPMA分析表明钴铬合金与金圆柱体之间粘结牢固。钴铬合金/焊料/金圆柱体试件释放的元素与钴铬铸件释放的元素相似。
结果表明，使用高熔金焊料连接钴铬合金与金圆柱体制成的上部结构具有足够的粘结强度和高耐腐蚀性。这些由钴铬合金和金圆柱体组成的混合框架有望成为植入上部结构的假体，其成本低且机械性能良好，可替代传统的高金合金。
