带台阶和双向骨螺纹的牙体修复固位钉、桩系统

Dental prosthesis retention pin and post system with steps and bidirectional screw thread

目的设计一种生物力学功能更好的牙体修复固位钉、桩系统。方法分析固位钉、桩系统在口腔中实际受到的生物力状态,设计新的钉、桩结构,并在离体牙上进行实验验证。结果所设计的带台阶的双向骨螺纹Φ0.75的固位钉能提高固位力30～140 N,台阶能再提高抗咀嚼力20～50 N。结论该钉、桩系统能增加抗咀嚼力值,降低金属弹性模量高对牙体牙本质的损伤,使修复固位疗效改善、寿命延长。

Objective To design a dental prosthesis retention pin and post system with better biomechanical function. Methods According to the actual biological stress of retention pin and post system in oral cavity, design a new pin and post structure, and carry on experiment on teeth in vitro. Results The designed two-way bone threaded retention pins with Ф.75 could improve the retention force by 30 - 140 N, and the steps could further improve resistance to chewing force by 20 - 50 N. Conclusions The pin and post system can increase the value of resistance to chewing force, reduce the harm to tooth dentin caused by metal with high modulus of elasticity, improve the repair and retention effect, and extend the life of retention.