Journal ArticleDOI
A New Tightening Technique for Threaded Fasteners
Masaya Hagiwara,Nobutoshi Ohashi +1 more
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In this paper, a new technique for tightening threaded fasteners was proposed aiming to assure the quality and the reliability in the tightening operations, which is based on the torque difference and the relative rotation angle in tightening and loosening process.Abstract:
A new technique for tightening threaded fasteners was proposed aiming to assure the quality and the reliability in the tightening operations. The technique is based on the torque difference and the relative rotation angle in tightening and loosening process, and no preliminary experiment is required. Repeated tightening (and loosening) experiments were performed for different types of lubricant to verify the applicability of this technique. Experimental results show that the preload provided to the joint can be estimated with high accuracy and precision by this technique, and the possibility to boost the reliability of tightening control is confirmed.read more
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Journal ArticleDOI
Tightening characteristics for screwed joints in osseointegrated dental implants
Richard L. Burguete,Richard Johns,Richard Johns,Toby King,Toby King,Eann A. Patterson,Eann A. Patterson +6 more
TL;DR: The significance of tightening abutment screws and gold cylinders to osseointegrated fixtures with the correct torque is demonstrated, and a simple relationship between applied torque and screw preload is derived by use of mechanical engineering principles.
Journal ArticleDOI
Implant abutment screw rotations and preloads for four different screw materials and surfaces.
TL;DR: The Gt and Tt abutment screws with enhanced surfaces that help reduce the coefficient of friction produced greater rotational angles and preload values than the conventional gold alloy and titanium alloy screws.
Journal ArticleDOI
Preloads generated with repeated tightening in three types of screws used in dental implant assemblies.
TL;DR: The gold-coated screw showed markedly higher preloads for all insertion torques and for all instances of tightening when compared with the uncoated screws, which indicates that this type of screw will maintain a secure joint when tightened for the second and third time.
Journal Article
Preload loss in gold prosthesis-retaining screws as a function of time.
Andrew Cantwell,John A. Hobkirk +1 more
TL;DR: Torsional relaxation of the screw shaft, embedment relaxation, and localized plastic deformation of the gold alloy and opposing titanium threads were the most likely explanation for this phenomenon.
Journal Article
A clinical study of the efficacy of gold-tite square abutment screws in cement-retained implant restorations.
TL;DR: The use of the Gold-Tite square abutment screws, torqued to 35 Ncm, maintained a stable implant/abutment connection that was successful in clinical practice for this minimal evaluation period add to the growing evidence that abutments with enhanced surfaces may provide increased screw/implant contact, higher rotational values, and calculated preload values.
References
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Book
An introduction to the design and behavior of bolted joints
TL;DR: In this article, the authors introduce the concept of tension and stress in the bolted joint and provide a theoretical analysis of the behavior of the joint under tensile loads and a closer look in-service behavior of a shear joint joint joint failure.