Three Dimensional Finite Element Analysis Of Biomechanics Effect Of Maxillary Canine With Different Alveolar Bone Height

Objective:To create partial three-dimensional finite element models of maxillary canine with different alveolar bone height.From a biomechanics point of view,to research the changes of stress on the alveolar bone caused by different height of alveolar bone and action point.To obtained the optimal force systems required for distal movement of maxillary canine at different levels of alveolar bone loss.Further the optimal position of bracket bonded based on alveolar bone loss, providing a reference basis for clinical works.Method:1.A series of head-face CT images of a healthy volunteer were collected.The digital images were importinto MSC.Marc20053D FEM software after Three-dimensional were reconstructed using MIMICS software.2.Create partial three-dimensional finite element models of maxillary canine with 3mm/5mm alveolar bone height by the deletion of units based on the established normal models.3.Force systems required for distal movement of canine are loaded on each model:30-50 horizontal force and 1000g/m couple, height of bracket bonded is 4mm.To obtain optimal loading system on each model through comparing the Von Mises stress on each model and distribution range of stress cloud atlas.4. Position of bracket bonded move to cervical margin 1mm,2mm,3mm combine to force systems required for distal movement of canine,finding the optimal value of loading and the optimal loading site at different levels of alveolar bone loss.Result:1.A partial three-dimensional finite element models of maxillary canine with 0mm/3mm/5mm decreased alveolar bone height were established successfully.it is of 124513 nodes and 27552 elements.2. When alveolar bone height and position of bracket bonded are normal Under 100g-120g loading,the stress of teeth and alveolar bone is well-distribute,the Von Mises stress is minimum.3.When alveolar bone height reduce 3mm while under 80g-100g loading or alveolar bone height reduce 5mm while under 70g-90g loading, the stress of teeth and alveolar bone is well-distribute,the value of the Von Mises stress is approach to the optimal loading on model 1.4. When alveolar bone height reduce 3mm and position of bracket bonded move to cervical margin 1mm, under 90g-100g loading; alveolar bone height reduce 5mm and position of bracket bonded move to cervical margin 2mm, under 100g-110g loading. The stress of teeth and alveolar bone is well-distribute,the value of the Von Mises stress is approach to the optimal loading on model 1.Conclusion:1.When the alveolar bone loss 1/3 levels of root, optimal orthodontic force are 80g-100g and the Optimal value of M/F are 10-12.5,furthermore, Position of bracket bonded move to cervical margin lmm, stress concentration can be relieved it is also helpful to health of periodontal tissues.2. When the alveolar bone loss 1/2 levels of root,optimal orthodontic force are 70g-90g and the Optimal value of M/F are 11.1-14.3,furthermore, Position of bracket bonded move to cervical margin 2mm, stress concentration can be relieved.3. when the alveolar bone loss of teeth was loaded the equal Orthodontic forces,the stress concentration of alveolar ridge crest can destruct the periodontal tissues.4. Make sure bodily movement of teeth at different levels of alveolar bone loss for reducing stress of apical region.5. In order to avoid the destruction of periodontal tissues caused by the significant increasing of stress,adjusting the value of stress based on levels of alveolar bone loss and the Optimal value of M/F...