螺钉固位种植固定义齿修复单个后牙缺失

Replacement of Single Posterior Teeth with Screw Retained Endosseous Implant Restorations

对23例无磨牙症失牙患者植入58枚两段式(two-stage)种植体,修复47个缺失后牙作一回顾性研究。采用抗旋转上部结构进行单冠修复 ,并以螺钉固位。追踪观察2年,结果表明:2枚种植体愈合阶段松动拔除,种植体累计成功率为94.8% ,修复后成功率97.2%,种植体固位螺钉松动1～2次者占23.6%。近期观察证明,一个或两个种植体支持单个后牙缺失修复是可行的。本文对螺钉松动的原因进行了阐述。

This retrospective report presents findings on 23 patients with 58 implants supporting 47 single lost posterior teeth restorations.Patient with single posterior tooth implant replacement. Follow-up study for 24 months,The cumulative success rate were 94. 8%,which reflects the loss of two implants during the healing stage. Restoration success rate were 97.2%.All implants were restored on abutments with nonrotating cylinders.The occlusion for all restorations was developed to minimize centric contacts and lateral interference.The frequency of retaining-screw loosening was 23.6% for 47 patients.No incidence of crown or implant fracture occurred. Within the limits of this study,replacement of single posterior tooth by one or two implants-supported restorations was predictable;however,a high incidence of retain screw loosening was seen.The mechanism of screw loosing and the preventions was present in this paper.