| When the orthodontists are making planning, not only they should consider that themselves, they should communicate with the patient and their family and tell them the state of the illness, so that their ideas can be considered when the orthodontists are making planning. The computer-aided prediction system is the bridge to the communion. Now the technology of image manipulation in computer and the development of orthodontics have provided advantage to found the computer-aided prediction system. Through the computer system we can predict the soft profile after treatment, so that we can provide advantage to the communion between orthodontists and patients, make planning, and predict the curative effect. So that this study found the computer-aided prediction system for adolescents with four premolars extracted in bimaxillary elementarily and look forward to promote the communion between orthodontists and patients and improve the level of therapy. This paper included three parts as follows:1 The study of changes in cranio-facial and soft tissue and hard tissue after orthodontic treatment with four premolars extracted in bimaxillary protrusion in adolescents.The study selects 34(male 13, female 21) bimaxillary protrusion's adolescents from 12 years old to 16 years old and take lateral cephalometric radiograph before and after the treatment.One person describes and confirms the dots specially. There are 11 cranio-facial controls and 12 hard tissue controls and 18 soft tissue controls are contrasted before and after orthodontic treatment. So that we can get the data we need to found the computer-aided prediction system for adolescents with four premolars extracted in bimaxillary. Results: There are no changes in FH-SN, Y axis angle, N-S-ANS, S-N-ANS, N-S-Gn, S-N-Gn, FMA and RP-MP before and after treatment in statistical sense and S-NU S-ANS and S-Gn changed in statistical sense in male and female group in the 11 cranio-facial controls; U1-SN, L1-SN, ANS-Np, A-Np, U1-Np, L1-Np, B-Np and Pog-Np changed in statistical sense in male and female group in the 12 hard tissue controls, the vertical distance of ANS-A, A-B, U1-A and L1-B were not changed; in the 18 soft tissue controls FH-N'Pg', N'-Sn-Pg', LsSn-SN, Cm-Sn-Ls, LiSi-SN, Sn-A ,U1-Ls, Li-L1 and Pn-Sn changed in statistical sense in male and female group, Li-Np changed in statistical sense in female group, there were not changed in Stms-Sn, Stmi-B, Ls-Stms, Li-Stmi, N-N', Ls-Np, Si-B and LNH. The ratio of soft tissue and hard tissue retraction is different in male and female group.2 Found the computer-aided prediction system on the soft tissue profile for adolescents with four premolars extracted in bimaxillary.Our system was established on the basis of Windows 2000 and the VisualC++6.0. The design of the whole system abides by ides of OO(Object Oriented). The cephalometric of the lateral cephalometric radiograph that was took before treatment was made and scan the image of cephalometric into computer. Then we confirmed the dots and distilled the image. The parts those have been distilled were translated, rotated, elevated and flexed according to the data we have measured to predict the trace of cephalometric after treatment. We scan the lateral photograph of the patient before treatment into the computer and tie in the photograph and the trace of the soft tissue in the cephalometric. Then predict the lateral face according to the trace of the soft tissue profile that wehave predicted.3 Study the veracity of computer-aided prediction system on the soft tissueprofile for adolescents with four premolars extracted in bimaxillary.Selects 17(male 6, female 11 )bimaxillary protrusion's adolescents from 12 years old to 16 years old and take lateral cephalometric radiograph before and after the treatment. Predicted the trace of cephalometric after the treatment and measured that. 14 hard tissue controls and 12 soft tissue controls are contrasted between the predicted cephalometric and cephalometric after orthodontic treatment, so that we can know the verac... |
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