下顎前突症の顎矯正外科のための頭部Ｘ線規格写真計測および側貌予測システムとその応用

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  • Computer-aided cephalometric analysis and profile prediction system for orthognathic surgery of mandibular prognathism and its application.

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In recent years, corrective surgery for jaw deformity has been performed much more frequently and since facial improvement is one of the goals of orthognathic surgery there is increasing need for better methods of rapid and accurate cephalometric analysis and prediction of the results of orthognathic surgery. The authors developed a computer aided cephalometric analysis and profile prediction system for orthognathic surgery of mandibular prognathism which is a common jaw deformity in Japan.<BR>This system consists of personal computer, color graphic display, digitizer, graphic plotter and printer, and has six functions as follows:<BR>1) Input and storage of the data from lateral cephalogram.<BR>2) Hard-tissue structure analysis by Downs-Northwestern method (20 measurement items).<BR>3) Soft-tissue profile analysis by Legan-Burstone, Ricketts, and Merrifield (14 measurement items).<BR>4) Prediction of soft tissue profile as a result of mandibular set back.<BR>5) Soft-tissue profile analysis of predicted profile.<BR>6) Computer graphic illustration of the existing pre-, and post surgical profiles and predicted profile.<BR>Prediction of the post surgical profile, which is the main function of this system, can be carried out immediately after digitization of the hard tissue landmarks located on the anterior mandible which are moved to a position to make good interincisal relationship and stable occlusion with reference to model surgery. The predicting equations were derived from stepwise multiple regression analysis on the basis of the 40 sets of pre-and post surgical lateral cephalograms of mandibular prognathic patients operated by mandibular set back. The suggested advantages of this system are as follows:<BR>1) Cephalometric analysis of hard and soft tissue profiles and the profile prediction can be carried out rapidly, easily and accurately.<BR>2) Post surgical profile is predicted by multiple regression equations for each coordinate of each landmark, since the post surgical profile is the result of the interaction of many variablesrather than simple one-to-one variable relationship.<BR>3) The profile line is drawn by computer graphics as a line passing the predicted soft tissue landmarks and therefore no artistic skill is required.

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