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Purpose with the correction of the development and popularization of technology , more and more adult patients hope to get \the attention of all ages as well as orthodontic physician . The tongue side of the bracket spacing , orthodontic force action point to the impedance center distance and location relations buccal appliance technology , therefore , are different from those of the buccal orthodontic biomechanics or the use of a variety of orthodontic devices technology. Currently , a biomechanics research lingual orthodontics advanced and effective , convenient and practical method of three-dimensional finite element analysis . Since 1973 Thresher three-dimensional finite element method (3D finite element method, 3D FEM) is applied to areas of the oral cavity , FEM has become an effective mathematical tool widely used in various fields of oral medicine , biomechanics in Orthodontics the study also shows its unique advantages , and achieved tremendous results . Many applications tongue side technology successful correction of clinical reports and research about the biomechanics of the maxillary central incisor lingual orthodontics , but the mandibular first molars lingual orthodontics biomechanics research literature has not been reported . With the help of three-dimensional finite element method , the establishment of the periodontal ligament , alveolar bone of the mandibular first molars three-dimensional finite element model , simulate lingual orthodontics role in the first mandibular molars force point , observed in different a variety of situations , clinical operations for lingual orthodontics load the mandibular first molar displacement , stress and periodontal tissue stress distribution in the understanding of the mechanism of orthodontic tooth movement , master lingual orthodontics technology to produce orthodontic force to provide a theoretical guidance and biomechanical basis so as to effectively guide clinical treatment . Method 1 . Choose sample : Select dentition complete , normal occlusion , periodontal disease and alveolar bone resorption , dental defects and obvious wear healthy adult male volunteers . Spiral CT Scan: the detected object supine position , the chin elevation fixed head , wearing with pre-
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