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Evaluation of stresses and forces in selected I-bars using the finite element method
P R Naik1, M G Duncanson, D L Mitchell
1Department of Removable Prosthodontics, University of Oklahoma, College of Dentistry, Oklahoma City 73190, USA.
Summary
Finite element analysis modeled I-bar clasps, revealing stress locations vary with anchor length. Maximum stresses occurred on the flat side of half-round, tapered I-bar clasps.
Area of Science:
- Biomaterials Engineering
- Dental Prosthetics
- Mechanical Engineering
Background:
- Dental clasps are crucial components in removable prosthodontics.
- Understanding clasp biomechanics is essential for optimizing prosthesis design and patient comfort.
- Previous studies have primarily focused on simpler clasp geometries and analyses.
Purpose of the Study:
- To investigate the stress distribution and reaction forces in three-dimensional models of I-bar clasps.
- To compare half-round, tapered and full-round, untapered I-bar clasps under varying deflection.
- To utilize the finite element method (FEM) for detailed biomechanical analysis.
Main Methods:
- Construction of 3D FEM models for half-round, tapered and full-round, untapered I-bar clasps.
- Varied clasp configurations based on anchor end length (25%, 35%, 50%).
- Deflection analysis at 0.01, 0.02, and 0.03 inches at 1 mm from the clasp tip.
Main Results:
- Maximum von Mises stresses ranged from 0-154.3 MPa (half-round) and 0-100.9 MPa (full-round) at 0.01-in deflection.
- Reaction forces varied from 1.60-6.31 N (half-round) and 0.22-2.13 N (full-round).
- Stress and force increased linearly with deflection, with stress location remaining consistent within groups.
Conclusions:
- The length of the anchor portion significantly influences the location of maximum stress.
- Maximum stress concentrations were observed on the flat side of the half-round, tapered I-bar clasp models.
- FEM provides valuable insights into the biomechanical behavior of different I-bar clasp designs.