An Experimental Study on the Joining for Component in the R.P.D.

本研究的目的是评估框架的连接强度，除非焊接。设计了四种类型的接头（对接接头，钎焊对接接头，钎焊搭接接头，T形接头），并使用树脂块作为对照。用50 μ mAl_2O_3对钴铬合金铸件进行喷砂处理，并充填粘结性热固化树脂。每组5个样本，共计25个样本。在万能试验机上，以2.0mm/min的十字头加载速率，对试件施加三点弯曲载荷，得到如下结果. T形接头的最大刚度比钎焊对接和搭接接头的最大刚度高约2倍. T型接头的极限强度高于焊接接头和搭接接头，表明三维支架的接头强度差异显著，可以长期临床使用。

The purpose of this study was to evaluate the joint strength of frameworks unless the soldering. Four types of joint (butt joint, soldered butt joint, soldered lap joint, T-shaped joint) were designed and a resin block was used as a control. The castings using Cobalt-chromium alloy were sundblasted with 50mumAl_2O_3, and adhesive heat-cured resin was packed. There were five specimens for each group and totaled 25 specimens. A three-point flexure load was applied to the jointed specimens with a universal testing machine and at crosshead rate of 2.0mm/min.The results obtained were as follows.1. The maximum stiffness of T-shaped joint were approximately 2 times higher than that of soldered butt joint and lap joint.2. The ultimate strength of T-shaped joint showed the stronger than that of soldered butt joint and lap joint.The results of this study suggest that three-dimensional frameworks have significant differences in joint strength and can perform long term clinical service.