P P Binon1. 1. Department of Restorative Dentistry, School of Dentistry, University of California San Francisco, USA.
Abstract
STATEMENT OF PROBLEM: Abutment screw loosening of single and multiple fixed partial dentures attached to external hexagonal implants is commonly encountered. PURPOSE: A technique that has been reported to prevent abutment screw loosening was tested with cyclic loading to determine its effectiveness. MATERIAL AND METHODS: A sample using identical components and test protocol, with the abutment screw tightened to 20 Ncm, was used as control. RESULTS: On the basis of the data obtained, the recommended technique does not increase resistance to screw loosening. The control sample sustained a mean number of cycles to screw loosening of more than twice that of the technique evaluated.
STATEMENT OF PROBLEM: Abutment screw loosening of single and multiple fixed partial dentures attached to external hexagonal implants is commonly encountered. PURPOSE: A technique that has been reported to prevent abutment screw loosening was tested with cyclic loading to determine its effectiveness. MATERIAL AND METHODS: A sample using identical components and test protocol, with the abutment screw tightened to 20 Ncm, was used as control. RESULTS: On the basis of the data obtained, the recommended technique does not increase resistance to screw loosening. The control sample sustained a mean number of cycles to screw loosening of more than twice that of the technique evaluated.
Authors: Antonio Gabriel Lanata-Flores; Eder Alberto Sigua-Rodriguez; Douglas Rangel Goulart; Veber Luiz Bomfim-Azevedo; Sergio Olate; José Ricardo de Albergaria-Barbosa Journal: J Korean Assoc Oral Maxillofac Surg Date: 2016-12-27