Carr A B, Brunski J B, Hurley E
Ohio State University, College of Dentistry, Columbus, USA.
Int J Oral Maxillofac Implants. 1996 Sep-Oct;11(5):589-98.
This study reviews fundamental concepts related to the use of screws and presents data describing the effect of fabrication, finishing, and polishing procedures on as-received preload for implant cylinders. Specifically, this study measured and compared preload produced when using as-received gold cylinders (the reference or gold standard), and cast cylinders produced from premade gold and plastic cylinders in the as-cast condition and following postcast finishing and polishing manipulations. The results reveal that preload in the gold screw-gold cylinder-abutment joint can be affected by the casting process, and that the choice of cylinder type, casting alloy, investment, and finishing/polishing technique may affect the resultant preload as compared to as-received joint conditions. The data from this study indicate that when plastic patterns are used as part of the framework, finishing and polishing of implant cylinder components should provide an increased preload compared to no such manipulations. Also, if maximum preload is desired, the use of premade metal cylinders offers an advantage over plastic patterns in both preload magnitude and precision.
本研究回顾了与螺钉使用相关的基本概念，并给出了描述制作、修整和抛光程序对植入圆柱体初始预紧力影响的数据。具体而言，本研究测量并比较了使用初始状态的金圆柱体（参考物或金标准）以及由预制金圆柱体和塑料圆柱体在铸态以及铸后修整和抛光操作后制成的铸造圆柱体时产生的预紧力。结果表明，金螺钉 - 金圆柱体 - 基台接头中的预紧力会受到铸造过程的影响，并且与初始接头条件相比，圆柱体类型、铸造合金、包埋料以及修整/抛光技术的选择可能会影响最终的预紧力。本研究的数据表明，当使用塑料铸型作为框架的一部分时，与不进行此类操作相比，植入圆柱体部件的修整和抛光应能提供更大的预紧力。此外，如果需要最大预紧力，在预紧力大小和精度方面，使用预制金属圆柱体比使用塑料铸型更具优势。
