| Objective:In order to analyze and explore the biomechanical characteristics of customized lingual orthodontics in en-masse retraction period,we selected a bimaxillary protrusive patient as the object of the research,who was determined to extract four first premolars and take customized lingual orthodontic treatment.With the help of cone-beam CT obtaining this patient's radiographic information and reverse engineering technology,we are able to construct a 3-demensional finite element model(FEM)of customized lingual orthodontics in en-masse retraction,which also included two mini-screw anchorages at palatal side for upper anterior teeth retraction.By observing and measuring the movement of each tooth after retraction forces loaded,we can inspect the accuracy and reliability of this 3-demensional finite element model.Methods: 1.We chose a healthy adult female with complete dentition,mild crowding and Class I molar and canine relationship as the sample of this research,whose chief compliant was “mouth protruding”.2.After we finished alignment and leveling of both arches and got ready to use sliding mechanics in en-masse retraction,utilize CBCT scanning the patient's maxilla and mandible to get her radiographic information.3.Use Mimics 15.0,Geomagic Studio 2013,Simpleware 6.0 and Hypermesh12.0 software applications to construct a FEM of customized lingual orthodontics in en-masse retraction which include maxilla,mandible,alveolar bone,dentitions,periodontal ligaments(PDL),e-Brace customized lingual system,mini-screw anchorage.4.By observing and measuring the stress and movement of each tooth after retraction forces loaded on FEM in Abaqus 6.12 software application,we can inspect the accuracy and reliability of this model.Results:An entire 3-demensional finite element model including maxilla and mandible,alveolar bone,dentition,periodontal ligament(PDL),e-Brace customized lingual system,micro-screw anchorage was constructed by this method.Conclusion:An entire 3-demensional finite element model including maxilla,mandible,alveolar bone,dentitions,periodontal ligaments(PDL),e-Brace customized lingual orthodontic system,mini-screw anchorage was constructed.By observing and measuring the stress and movement of each tooth after retraction forces loaded,we proved that this 3-demensional finite element model is accurate and reliable.We can use further analysis to get a better understanding of the biomechanical characteristics of customized lingual orthodontics in en-masse retraction period. |
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