Establish A Three-dimensional Finite Element Model For Physiological Anchorage Spee-wire System Appliance And Analysis Of Pressure In Upper Arch

Objective: To establish a three-dimensional finite element model for physiological anchorage Spee-wire System appliance and analysis of pressure.Method: A volunteer of individual normal occlusion was Selected.The date of the person by ct scanning was imported into software of Mimicsl7.0,to obtain three dimensional model of reconstruction method teeth and jaw bone(cortical bone and cancellous b-one)by three dimensional reconstruction method.The three dimensional model was moved on to reversely engineering software Geomagic studio through the format of STL and give them refinement and refinement.The appliance of three-dimensional model was obtained by the data of appliance through the design of NX software Arch wire was defined as geometrically nonlinear.Teeth,jaws,appliance and wire model were obtained,then imported them into NX software by the format of stp to assemble and meshed with ANSYSl5.0 software.Ultimately,get the three-dimensional finite element model of teeth cortical bone,cancellous bone,teeth arch wire and intrusion arch and obtain three dimensional model of upper arch containing lower auxiliary arch and PASS.Analyze the distribution of the whole arch when advocate complementary bow of ligation loci located on central incisor mesial,lateral incisor mesial and distal and the movement trend of front teeth.Results: 1.To build a whole model of three dimensional finite element of the teeth,jaws,and physiological and correcting device,arch wire.2 To simulate the situation of force and displacement in orthodontic clinic.3 The result of lowering the front teeth was obvious when ligation loci located between central incisors.The effect of flaring the front teeth is apparent when ligation loci located on lateral teeth mesial.Lingual inclination compared with lower of front teeth appeared when ligation loci located on lateral teethdistal.The trend of molars retrodisplacement was much bigger under the three conditions.Conclusion: the finite element model with physiological resistance controlling appliance was authentic,accurate and strong similarity of geometric,which could simulate distribution of pressure and displacement trend in clinical teeth and be conducive to the understanding application of the technology in clinic.