Schulte J K, Coffey J
Department of Diagnostic/Surgical Sciences, University of Minnesota, School of Dentistry, Minneapolis 55455, USA.
Implant Dent. 1997 Spring;6(1):28-31.
Fracturing or loosening of abutment and retaining screws is a frequent occurrence. This study was designed to evaluate the retaining ability of nine abutment systems. Abutment and retaining screws were secured to the appropriate implant using a digital torque gauge, with the abutment screws placed at 30 N-cm and the retaining screws at 10 N-cm. Removal torque was recorded three times for each sample 10 minutes after initial placement, 20 minutes after retightening, and 24 hours after retightening. There was no statistical difference in removal torque relative to time or repeated tightening. Of the nine abutment systems, three were statistically less retentive as compared with the most retentive system. The retaining screws were less retentive as compared with the abutment screws. For maximum retention the elimination of retaining screws from the restorative design and using 30 N-cm of torque for the abutment screws is suggested.
基台和固位螺钉的断裂或松动是常有的事。本研究旨在评估九种基台系统的固位能力。使用数字扭矩计将基台和固位螺钉固定到合适的种植体上，基台螺钉的扭矩设定为30 N-cm，固位螺钉的扭矩设定为10 N-cm。在初次放置后10分钟、重新拧紧后20分钟以及重新拧紧后24小时，对每个样本记录三次拆除扭矩。拆除扭矩相对于时间或重复拧紧没有统计学差异。在九种基台系统中，与固位能力最强的系统相比，有三种在统计学上固位能力较弱。与基台螺钉相比，固位螺钉的固位能力较弱。为实现最大固位，建议在修复设计中去除固位螺钉，并将基台螺钉的扭矩设定为30 N-cm。
