Mandibular Deformity Three-dimensional Reconstruction And Simulation Of Surgery

Mandibular retrusion is a common Eastern populations maxillofacial deformities in the country's southern provinces even more prevalent among the crowd, the patient opened lips Luya, on the lower lip can not be a natural close, smile exposed gums, anterior deep overbite (occlusal), deep coverage, occlusal dysfunction, severely affecting their appearance and psychological. Move through orthognathic surgery in patients with abnormal position of the upper and lower jaw, can be substantial, to adjust and correct a wide range of facial bone structure, and thus alteration or reconstruction of a person's appearance, in particular, is a two-jaw surgery can be converted facial surface in the central and side 1/3 of the structure, it is the traditional new developments in cosmetic surgery is a major cosmetic surgery Orthognathic surgery. Occupy the facial structure of jaw 2/3 position, location, dignitaries, relationships, appearance, there are expressive of the soft tissue coverage on it, compared to the distribution of symmetry during the organ, each with characteristics of mutual harmonization, an exception will affect the whole picture. Jaw, teeth and surrounding tissues of the normal relationship between the proportion of facial harmony and aesthetic foundation. If the size and the upper and lower jaw occurred, before and after the location of about disorders constitute deformity, jaw deformity due to destruction of such a harmonious relationship between the proportion of the facial appearance can cause obvious defects, a direct impact on quality of life. Jaw deformity not only affect the appearance, it will also appear chewing dysfunction and temporomandibular joint disorders.With the development of modern computer science and technology, medical image processing and analysis more and more attention has been paid, and has been widely used in clinical, doctor-assisted diagnosis and differential diagnosis of cleaning. Although ordinary X-ray and CT scan cross-sectional images of the disease, the diagnosis of cranio-maxillofacial surgery plays an irreplaceable role in routine diagnosis is an indispensable tool, but it can only appear two-dimensional image, the former once the impact of diagnostic imaging often overlap, while the CT images the lack of an overall image, three-dimensional reconstruction to overcome its deficiencies. Three-dimensional reconstruction is based on the true anatomical structure of continuous cross-section images through the right place, registration, segmentation and other image processing, in the two-dimensional screen shows three-dimensional structure. Domestic three-dimensional reconstruction of mandibular few studies, especially for mandibular retrusion research is particularly scarce.Maxillofacial orthodontic treatment often genioplasty as an adjunct method is applied to jaw deformity surgery Orthognathic surgery. Genioplasty include narrow chin augmentation and chin surgery, is the correction of chin deformities commonly used surgical methods. It involves jaw before and after and after the reduction to the forward, up and down to the growth and shortening, and left to the German move, broadening and narrowing. Mandibular retrusion in particular deformity genioplasty, which we will position osteotomy? Then how to cut bone, what is the point of view? How to achieve the desired aesthetic effect and can reduce surgical time and complications? All the clinical treatment of these is what we need to solve the problem.The purpose of this study is to explore the use of three-dimensional software design mandibular retrusion the feasibility of surgery.Methods:Male patients before obtaining the amount of nodules to the jaw from the lower margin of lcm thin CT scan done, slice thickness 1.5mm, CT image 512×512 pixels,64-slice spiral CT data. The DICOM format data into Mimics10.0 body CT, the use of gray level threshold for image segmentation, hand trimmed surface reconstruction after partition, the standard export to STL CAD model; into RapidForm2006 associated parameter measurement, after the import Geomagic8.0 for osteotomy simulation, completed simulation surgery. Reference simulation and the measured parameters during surgery, the patients chin plasty, after 6 months further CT scan reconstruction after healing was observed, for the second measurement data and compared with the preoperative data. Results:Reconstruction of the mandibular model and successfully simulated operation, the simulation results are applied to surgery, preoperative simulation and intraoperative findings consistent with high, surgery is better. One N-Pg values before surgery-22.17mm, postoperative-9.56mm; Pg-Pg 'value before surgery 9.61mm, postoperative 16.04mm G-Pg'value before surgery-12.88mm, postoperative-3.04mm, and the simulation model and post-operative skull reconstruction after skull reconstruction after the model has a high degree of agreement.Conclusion:Using 3D software to simulate mandibular retrusion and deformity correction surgery can improve the predictability of operation and accuracy of surgical patients who have a stronger grasp the significance.