Biomechanical Analysis Of Periodontal Ligament Of Rapid Canine Movement Through Reducing Resistance And Distraction Osteogenesis

Objective:To establish a three-dimensional finite element model of rapid canine movement through reducing resistance and distraction osteogenesis which can be applied to mechanical anayses of the canine periodontal ligament, and layed a theoretical foundation for the clinical application of this method. Methods: By 64-slice spiral CT scan, obtained mandible, mandibular dentition section DICOM image data. Using Mimics 17 software, Geomagic Studio 2013 software, Unigraphics NX 8.5 software, ANSYS Workbench 13.0 software combined method, four three-dimensional finite element models were established, including the canine movement under conventional condition(model 1), rapid canine movement through cortical incision(model 2), rapid canine movement through the periodontal ligament distraction osteggenesis(model 3), rapid canine movement through dentoalveolar distraction osteogenesis(model 4), the stress distribution of the periodontal ligament were observed after distraction. Results:â‘ The three-dimensional finite element models of rapid canine movement via reducing resistance and distraction osteogenesis successfully established by the computer imagine analysis system and related software with better geometrical and mechanical similarity whith provide a good platform to analysis the biomechanical mechanism in rapid canine movement via reducing resistance and distraction osteogenesis. â‘¡Under the initial stress, the maximum equivalent stress in model 1 and model 2 mainly concentrated in the canine distal periodontal ligament of 1/3 partial lingual side. The maximum equivalent stress in model 3 and model 4 mainly concentrated in canine distal periodontal ligament of 1/3 partial labial side. The maximum equivalent stress: model 4>model 3>model 1>model 2. â‘¢The maximum principal stress concentrated in canine mesial periodontal ligament on the 1/3 partial labial place in four models, the maximum principal stress: model 4>model 3>model 1>model 2.â‘£Under the initial stress, the maximum shear stress in model 1 and model 2 mainly concentrated in the canine distal periodontal ligament on the 1/3 partial lingual side. The maximum shear stress in the model 3 and 4 mainly concentrated in canines distal periodontal ligament of 1/3 partial labial. The maximum shear stress: model 4>model 3>model 1>model 2. Conclusion: â‘  A three-dimensional finite element model of rapid canine movement through reducing resistance and distraction osteogenesis was established whith provides a good analytical basis for further numerical simulation calculation. â‘¡The stress of PDL will change obviously during the orthodontic tooth movement under the surgical operation ways, it told us that we shoud prevent PDL from receiving excessive pressure in clinic work, especially using distraction device. â‘¢During the rapid canine tooth movement, group using conventional method and group using cortical incision method had a lingual rotating trend, group using periodontal ligament distraction osteogenesis and group using dentoalveolar distraction osteogenesis had a lip rotating trend, therefore,we should take the corresponding measures in clinical to avoid unnecessary rotation.