3-D Reconstruction And FEA Modeling Of Jaws And Dentition With Mimics

With the improvement of living standards and people's aesthetic appearance Yen attention, more and more patients who had orthodontic tooth hope the corresponding correction. Orthodontic tooth types of teeth are missing, the relationship between upper and lower arch of teeth abnormalities, as well as teeth, jaw and facial relations uncoordinated. In the process of growth and development of children, because of genetic disease, endocrine obstacles, malnutrition, dysfunction, oral bad habit, for the dental obstacles, as well as a number of other factors, led to the teeth, jaw, face deformities, such as missing teeth order, the abnormal relations between the upper and lower arch, jaw size of the location of abnormal morphology, such as facial deformities. Correction device is commonly used dental appliance, we have adopted the appliance which is the most advanced straight wire appliance, it has more efficient than the traditional standard wire appliance and much easier to achieve the best dental malocclusion.In the model building process, the high-resolution spiral CT scanning technology into the dental tissue fine three-dimensional finite element model, establish the surface morphology and structure of the internal organization of real teeth with a high degree of unanimity in the organization finite element model successfully. Finite element analysis software ANSYS analyses the tooth. Three-dimensional finite element analysis method as a mature theoretical mechanics analysis methods have come out 30 years, has been widely used in oral biomechanical research. With the continuous development of the software, the technology has developed by leaps and bounds. Through three-dimensional finite element analysis methods we could understand teeth, jaws and appliance force after the stress distribution and loading of the subsequent displacement trends. It has a certain extent guiding significance to these clinical orthodontic teeth corrected.By CT scans, to build three-dimensional finite element model, and analysis the forces'instance; based on the CT scan images, the use of CT imaging by CT, the elastic model can be calculated in accordance with empirical formula, which was the mandible the mechanical parameters. Concrete steps are as follows:Firstly, build a precise three-dimensional finite element model.1. Model's data acquisitionUsing CT scanning, can attain similar geometric entities, CT raw data have been saved directly to the stability of a CD-ROM. Using the original image data to establish itself as a finite element model. We avoid repeated operation of the various factors contributing to the process of the subjective part of the data and information lost. CT scanning can provide an accurate cross-sectional geometry, digital express, a specimen of the advantages of easy. Moreover, the volume of data and any location can scan 3D image reconstruction, and image processing rapidly, obtain abundant raw data storages, high-quality image reconstruction.2. RemodelingBased on the CT's data, we can use computer tomography technology and using Mimics and ANSYS software. With three-dimensional reconstruction, establish the mandible dentition accurate three-dimensional solid model.3. Mandible with different elastic modulusBecause of this study was to use Mimics put Mandible material attributes in 6 given.3D finite element analysis has provided a guarantee for the reliability of the results, compared with the same kind of material which be given Mandible to same attributes. These results are more true and reliable.The second part is to determine load and gain maximum stress. Finite element model of load conditions is simulated a major mandible load. After established material to mandible accurately, we choose four load conditions to compare the articular disc stress distribution and to discuss the results.Under different loads, the result of dentition and articular disc stress distribution showed: the size and speed of the relationship between tooth movement: When the value of the low, with the increase of tooth movement speed has also increased, when the value of higher, with the increase of tooth movement speed may not increase because too much Force can cause periodontal ligament transparent change, resulting in the extension of the slow phase, when creeping absorption completed, the teeth will grow rapidly in the new generation of space. Smaller force to gradually move teeth, and the larger of the fast-moving teeth in a period of slow obvious, in fact, from a longer time perspective, the larger the role of the tooth movement may be smaller than the average over small force. Clearly, because of organizational changes and the complexity of the factors, affecting the diversity of the size and speed of the relationship between tooth movements can not be assumed to be a simple linear relationship.Correction of the articular disc size and the relationship between the stress distributions: articular disc in more stress peak after peak stress and the left is always greater than the right. The group model reflects the physical more accurately, and the experimental results and clinical practice is similar, resolve some of the problems encountered in the past experiments, and provides a new way for TMJ biomechanics research.In this paper we analyze the material properties of jaws and teeth, and the situation in the articular disc under various load conditions stress distribution. The model has good mechanics and geometric similarity. The three-dimensional finite element modeling method is more accurate and feasible, and given the different modules of different elastic modulus accurately, which includes the amount of data can be done under the three-dimensional finite jaw Element Analysis of reference in the further. To a certain extent, it is also useful to guide clinical diagnosis and treatment of orthodontic tooth.