Abstract
Background and Objectives: This study aimed to evaluate stress in the surrounding jaw bone due to root proximity of orthodontic mini-implant, using three-dimensional finite element method (FEM). Materials and Methods: Three FEM models with different locations of mini-implants were designed and classified according to their proximity to the molar root: Category I: Screw was separate from the root (about 1 mm away), Category II: Part of the screw thread was embedded in the periodontal membrane, Category III: Part of the screw thread touches the root. Each screw was inserted at 30° mesial to mandibular molar and traction force of 2N was applied to it at 45°. Stresses in the cortical bone surrounding implant were determined. Results: Mini-implant which was separate from the root showed least amount of stresses within the bone as compared to the implants in the other two categories. The pattern of stress distribution was concentrated near the neck of the mini-implant (at the point of entry into the bone), away from the direction of force application. Interpretation and Conclusion: Stresses in the bone decrease as the distance of the orthodontic mini-implant relative to the root increases.
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