Abstract:

Abstract：Objective To evaluate that the retentive force of the micro-titanium nails can satiate the clinical appliance requirements of the full overdenture. Methods Two piece of the micro-titanium nails with 2 mm in diameter and 5mm in length were parallel screwed into modified and freshly isolated pig mandibles. The fixed micro-titanium plates were placed into the trench. The trench was fixed on a base of electronic universal testing machine. The specimens were loaded in tensile at crosshead rate of 1mm/min with a 1000N in frame. Results The maximum tensile strength among the groups is 564.25N, the minimum is 441.08 N，and the average is（513.15±44.92）N. Conclusion The maximum tensile strength of the micro-titanium plate and micro-titanium nail system is much higher than the attraction of magnetic attachment and the maximum occlusal force which is met when patients are chewing food with complete denture，it could satiate the clinical appliance requirements of the full overdenture.

Key words: tensile strength, micro-titanium nail, micro-titanium plate, the pig mandibles

摘要：

目的 测定微钛板系统中微钛钉的最大拉力值，探讨微钛钉的固位力可否满足全口覆盖义齿的临床使用要求。方法 本研究于2013年3月在大连市口腔医院和大连理工大学完成。将微钛板系统中的微钛钉拧入经修整后的新鲜猪下颌骨内，使用电子万能实验机测量微钛钉的最大抗拉力值。结果 微钛钉最高抗拉力值为564.25 N，最低抗拉力值为441.08 N，平均抗拉力值为（513.15±44.92）N。结论 微钛板系统的最大抗拉力值远远高于全口义齿在咀嚼食物时的最大咬合力及磁性附着体的固位力，其应用于全口覆盖义齿中是可行的。

关键词: 拉力值, 微钛钉, 微钛板, 猪下颌骨