Ferencz J L
J Prosthet Dent. 1987 Jun;57(6):696-703. doi: 10.1016/0022-3913(87)90366-0.
A total of 120 three-unit fixed partial dentures were made by using a latex mold to produce uniform wax patterns. Four groups were used to compare the tensile strength of connectors with interproximal solder, midpontic vertical solder, midpontic diagonal solder, and a control of one-piece castings. Three different metals were tested and the tensile load required to fracture the samples as well as the fracture sites were recorded. The following was found: Soldering the interproximal connector area produced the weakest solder joints, regardless of metal tested, at p less than .001. There was no significant difference in the fracture loads between midpontic vertical soldering and midpontic diagonal soldering with all three metals at p less than .01. There was no significant difference in fracture loads between midpontic soldering and unit casting with all three metals at p less than .01. The extreme variations in fracture loads when soldering nickel-chrome-beryllium confirms the technique sensitivity of presoldering this alloy.
使用乳胶模具制作均匀的蜡型，共制作了120个三单位固定局部义齿。采用四组来比较使用邻间焊接、桥体中部垂直焊接、桥体中部对角焊接的连接体的拉伸强度，以及一组整体铸造的对照。测试了三种不同的金属，并记录使样本断裂所需的拉伸载荷以及断裂部位。结果如下：无论测试何种金属，邻间连接体区域的焊接产生的焊点最弱，p值小于0.001。对于所有三种金属，桥体中部垂直焊接和桥体中部对角焊接之间的断裂载荷在p值小于0.01时无显著差异。对于所有三种金属，桥体中部焊接和整体铸造之间的断裂载荷在p值小于0.01时无显著差异。镍铬铍焊接时断裂载荷的极大差异证实了预焊接这种合金的技术敏感性。
