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Analytical Study of Stress Distributions around Screws in Flat Mandibular Bone under In-Plane Loading
Jinxing Huo1, Jan-Michaél Hirsch2, E Kristofer Gamstedt1
1Division of Applied Mechanics, Department of Materials Science and Engineering, Uppsala Univeristy, Box 35, SE-751 03 Uppsala, Sweden.
Bioengineering (Basel, Switzerland)
|July 29, 2023
Summary
Screw loosening in bone implants causes instability and infection. This study developed an analytic model to analyze stress around screws, finding friction significantly impacts bone stress, crucial for preventing implant failure.
Area of Science:
- Biomechanics
- Orthopedics
- Materials Science
Background:
- Mechanical bone implants are prone to screw loosening, a complication leading to infection and fracture non-union.
- Understanding stress distribution around implant screws is vital for preventing bone degradation.
Purpose of the Study:
- To develop an analytical model for analyzing stress distribution around screw holes in mandibular bone.
- To investigate the influence of friction coefficient and load direction on stress concentrations.
Main Methods:
- Simplified mandibular bone to an orthotropic laminated plate for in-plane loading analysis.
- Utilized complex stress analysis to create a 2D pin-loaded plate model.
- Performed parametric analyses on friction coefficient and load direction.
Main Results:
- Stress distributions were found to be insensitive to screw hole location on the mandible.
- Load direction had a negligible effect on stress patterns.
- Friction coefficient significantly influenced stress distributions, highlighting the importance of screw bonding.
Conclusions:
- The developed analytical model provides insights into stress states around bone screws.
- Screw-bone friction is a critical factor in implant stability and bone stress.
- The model can aid in studying bone failure and refining implant design using stress-based criteria.
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