Related Experiment Video
Updated: Jul 30, 2026
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Comparison of two systems for rigidly connecting 2.0-mm bone screws to an implantable device: in vitro stability
P van Loon1, L G de Bont, G J Verkerke
1TMJ Research Group, Department of Oral & Maxillofacial Surgery, University Hospital Groningen, Groningen, The Netherlands.
Abstract:
The stability of a screw-fixed implantable device can be improved by eliminating the freedom of movement between the screws and the device. Two systems have been developed for rigidly connecting 2. 0-mm bone screws to an implantable device, and the aim of this study was to test and compare the stability of the two systems. In system A, a fixing disc locked the screw-head. In system B, the thread of the screw locked directly into the device. The stability of the connection was tested by measuring the resistance against a torque on the screw, against shear loading, against push-out loading, and against dynamic shear loading (70 N) for 5 million cycles. Both systems met the required minimum values for the resistance against a torque, shear loading and push-out loading, and dynamic shear loading did not cause movements between the screw and the device. We conclude that both systems are stable, but prefer system B because it is easier to make and implant than system A.
