Related Experiment Videos
Tooth stiffness with composite veneers: a strain gauge and finite element evaluation
1Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, School of Dentistry, Minneapolis 55455, USA.
Summary
Composite veneer procedures reduce incisor stiffness. While composite restorations improve stiffness after preparation, they do not fully restore it to the level of an unaltered tooth.
Area of Science:
- Dental Biomaterials
- Biomechanical Engineering
- Restorative Dentistry
Background:
- Composite veneers are widely used for aesthetic and functional restoration of incisors.
- Understanding the biomechanical impact of these procedures on tooth stiffness is crucial for long-term success.
Purpose of the Study:
- To evaluate the effect of composite veneer preparations and restorations on the functional stiffness of human incisors.
- To compare experimental measurements with finite element (FE) modeling results.
Main Methods:
- Ten extracted human maxillary central incisors were tested using strain gauges and ramp loading to 50 N.
- Teeth were tested in unaltered, prepared, and restored conditions.
- Two-dimensional FE models were created to simulate each condition and calculate relative stiffness.
Main Results:
- Both strain gauge measurements and FE models showed decreased relative stiffness with increasing tooth structure reduction.
- Composite restorations increased stiffness compared to preparations but did not reach unaltered tooth levels.
- The 2D FE model showed good correlation (R=0.83) with experimental strain gauge data.
Conclusions:
- Resin composite veneers do not fully restore the native stiffness of an unaltered incisor.
- Progressive reduction in tooth structure significantly impacts incisor biomechanics.