摘要目的 分析平台转换种植修复基台折断原因,探讨处理办法及预防策略.方法 2001年1月至2014年12月植入的平台转换种植体2 487枚中,2009年3月至2014年2月发生平台转换种植修复基台折断6例,男性5例、女性1例,平均年龄63岁(55～78岁),均使用Ankylos(R)种植系统,6例均为修复完成2～8年后发生修复基台折断 分析修复基台折断与(牙合)力及其连接方式等因素的关系.结果 基台折断率为0.24％(6/2 487).6例折断基台均发生在磨牙区、牙冠(牙合)面均为贵金属.6例折断基台均无法完整取出,最终取出种植体后重新种植修复.结论 平台转换种植修复基台折断后取出困难,应注重预防此严重并发症.磨牙区种植修复应谨慎使用平台转换种植系统;通过增加种植体数量、采取烤瓷联冠修复可能降低基台折断风险.使用小直径、短种植体可减少取出种植体时的创伤,有利于再次种植.

abstractsObjective To explore the reasons for platform-switching abutment fracture,the treatment and prevention methods.Methods Between March 2009 and December 2014,all of the fractured platform-switching abutments were evaluated.The fracture rate of platform-switching abutments was calculated and the gender,age,implant site,implant size,abutment size,prosthetic type,loading time and crown materials were analyzed.Results A total of 2 487 platform-switching implants were placed during this period and 6 abutments were fractured.The fracture rate was 0.24％ (6/2 487).All of the 6 fractured abutments were placed in molar region.All occlusal planes were made of metal material.Five patients were male.All the fracture abutments could not be removed and the implants had to be removed and reimplanted.Conclusions Without special abutment removing instruments,it is difficult to remove the fractured platform-switching abutment.In molar region,platform-switching implant system should be carefully used.Increasing implants number and splinting crowns with porcelain occlusal planes might reduce the abutment fracture risk.