钛合金种植体临床断裂的原因分析

Microstructure Analysis of Fractured Ti Alloy Implant

摘要:

钛合金髓腔-骨内种植体周定15年后发生断裂．分别取出牙槽骨内和髓腔内的2部分种植体，做扫描电镜超微结构观察和材料表面附着物的元素能谱分析，结果发现2部分种植体断端均有疲劳源区，呈现典型的慢速和快速扩展区，同时经元素能谱分析证实在骨内段部分的螺纹内的沉积物中的Ca、P等成分含量比例明显增高．而髓腔内部分断端未见类似结果。证实种植体与骨组织间有良好的生物相容性和骨整合性，种植体断裂主要与长期人体内应用后的材料疲劳相关．术后维护治疗也有重要影响。

Abstract:

A pulp-osseous implant (Ti-6Al-4V) for treating a mobilized periodontal tooth fractured after 15 years of service. The two pieces of implant divided in bone and pulp were extracted and washed by distilled water. The microstructures of the cross sections of both fractured pulp-osseous implant pieces were observed by SEM, and the compositions of the material attached to the implant surfaces were analyzed by EDAX. The fatigue source, slowly and fast developed fatigue stripe is presented were obviously showed on the cross sections of both parts. EDAX showed a higher percentage of Ca, P attached to the bone implant, as compared to that attached to the pulp implant. The fracture of implant in this case was due principally to metal fatigue, and partly caused by a lack of periodontal maintenance.