Evaluation of mandibular molar mesialization by various methods with finite element analysis

Aim: The aim of our study is to examine the miniscrew supported and non-miniscrew supported mandibular molar mesialization methods with finite element analysis. Material and Method: Four different working models were created using the finite element analysis program. The models are formed by giving strength from miniscrew to the hook of the 2nd molar (Model 1), from the miniscrew to the arm extended to the center of resistance of the 2nd molar (Model 2), from the hook of the 2nd molar with indirect anchorage (Molar 3), and from the hook of 2nd molar with tooth-supported anchorage (Model 4). Maximum and minimum principal stresses in the tooth, alveolar bone and around the miniscrew in each model, Von Mises stress analysis and movement patterns in the teeth were examined separately. Results: As a result of the first model, the tooth was tipped mesially. Stress and strains were observed intensely around the molar tooth and miniscrew. In the second model, parallel movement of second molar occurred, stress were spreaded more evenly. In the third and fourth models, tipping and mesialization of the molar were similar, but the stresses and strains were different. Conclusion: The force applied to the miniscrew from the arm extended to the resistance center of the tooth is more effective. The stresses and stresses that occur during this force are more evenly distributed. With the use of the miniscrew as an anchor, the stress and tensions around the teeth are significantly reduced.