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Operator-induced compressive axial forces during implant gold screw fastening
I J Pesun1, M E Brosky, T W Korioth
1School of Dentistry and Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, Minneapolis 55455, USA. pesun001@tc.umn.edu
The Journal of Prosthetic Dentistry
|July 18, 2001
Summary
Operator experience impacts compressive axial force on implant gold screws. More experienced faculty applied less force, potentially affecting screw tension and loosening torque.
Area of Science:
- Dental Implantology
- Biomaterials Science
- Biomechanics
Background:
- Implant gold screws experience tension during fastening.
- Operator-induced compressive axial force can reduce screw tension and friction, potentially increasing tightening torque.
Purpose of the Study:
- To evaluate and compare compressive axial forces and torques on implant gold screws.
- To assess the influence of operator expertise on these forces and torques.
Main Methods:
- Utilized a calibrated electric torque driver and a miniature load cell to measure forces.
- Three operator groups (faculty, residents, students) repeatedly tightened and loosened gold abutment screws.
- Assessed compressive axial forces during torquing and evaluated inter- and intra-operator reliability.
Main Results:
- Loosening compressive axial forces consistently exceeded tightening forces; peak torque was lower during loosening.
- Faculty applied a narrower range of forces (mean 3.29 N) compared to residents (mean 2.74 N) and students (mean 3.01 N).
Conclusions:
- Clinical experience appears to influence the compressive axial force applied during gold screw tightening.
- Reduced unfastening torque may correlate with increased axial loading during implant screw procedures.