目的设计与新型髓内钉相配套的双皮质自攻螺纹交锁螺钉，并对其生物力学性能进行对比研究。
ABSTRACT: Objective To compare the biomechanical characteristics by designing newly manufactured cortex self tapping interlocking screw matched with interlocking nail.
产品有以下缺陷：水冷头上的安装孔没有螺纹，用配带的自攻螺丝安装非常困难。
there has no screw thread on the installation hole on head of water-cooling. It's difficult to install it by the screw tap which along the products.
目的：探讨自攻自断螺纹钉在大面积缺损牙保存性修复中的应用。
Objective To investigate the application of self-threading pins in the preservative of teeth with large area defects.
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