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Evaluation of the effectiveness of a technique to prevent screw loosening
1Department of Restorative Dentistry, School of Dentistry, University of California San Francisco, USA.
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.