Mechanical Stress Analysis on Mini Screws Using Limited Elements Modeling: Studying The Effect of Different Orthopedic Powers on The Stability of Miniature Implants.
DOI:
https://doi.org/10.59743/Keywords:
Mini screws, Orthopedic forces, Finite element analysis, Stress distribution, Implant stability, Titanium alloy, Orthodontic anchorage, Biomechanics, Cortical bone, Force directionAbstract
The study examines how different forces affect the distribution of stress and stability in orthodontic mini screws, by carrying out FEA. A clear three-dimensional model of a titanium alloy mini screw (1.6 mm diameter, 8 mm length) in maxillary bone was built and simulated by applying loads up to 2.0 N at angles 30°, 60° and 90°. For titanium, cortical bone and cancellous bone, we modeled their properties as isotropic and linear elasticity. Testing showed that as force and angle were made greater, the stresses around the miniscrew and their displacement also increased. When the screws were loaded with their maximum force (2.0 N at 90°), the stress in the surrounding bone approached 79.6% of its yield strength. The displacement increased by about 43% beyond the level clinicians want to see which could make the implant less stable. At the same time, forces below 1.0 N at angles of 30° to 60° brought the stress and displacement in line with clinical standards. This Results shows that correct selection of both force level and application direction is key to maintaining the lasting stability of orthodontic mini implants.
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