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Study on the development of algorithm of predicting system on the face after orthodontic treatment

正畸治疗后面部预测系统算法开发研究

基本信息

批准号：
11470449
负责人：
HANADA Kooji
金额：
$ 9.79万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The purpose of the present study was to evaluate change relation between hard tissue and soft tissue with orthodontic treatment and growth and to develop the algorithm of predicting system on the face after orthodontic treatment.1. Changes of the hard tissue and the soft tissue with orthodontic treatmentThe error by the superimpose on posterior-anterior cephalogram could objectively be analyzed by correcting with lateral cephalogram. As the results, the dentofacial structures could be accurately superimposed before and after treatment.2. The analysis of the growth aspect on dentofacial structuresThe growth aspects of skeletal Class III and Class I were analyzed as a structural problem. As the results, thin mandibular ramus at the Dental Age IIIA on the skeletal Class III cases became remarkable at the Dental Age IIIC.Similarly, the condyle in the skeletal Class III cases were remarkably lengthened at the Dental age IIIA to IIIC than in the Class I.And gonial angle were remarkably opened on the skeletal Class III than Class I.3. Three-dimensional surface changes on the face after orthognathic treatmentBy fixing the head of the subjects in the ear rod, the shape of the surface could be measured at the good accuracy. By this method, the change of the surface on the face was examined after advance of maxilla. As the results in the middle area upper part between ectocanthion and alare, there was no change. Noses were moved upward and forward after the operation. As the results, the tendency as a form with the flat and wide nose was recognized.4. The development of algorithm of predicting system on the face after orthodontic treatmentThe correspondence of many items for the orthodontic treatment was examined. The algorithm of the prediction of the face after the orthodontic treatment was developed. The accuracy is improved, by repeating examination, prediction, treatment and evaluation.

本研究的目的是探讨正畸治疗前后面部软硬组织的变化与生长发育的关系，并建立正畸治疗后面部软硬组织变化的预测系统.正畸治疗前后硬组织和软组织的变化头颅侧位片的校正可以客观地分析X线头颅后前位片的误差。结果表明：1.矫治前后牙面结构能够准确地重合.牙颌面结构的生长方面的分析将骨性III类和I类的生长方面作为一个结构问题进行分析。结果显示，骨性III类患者下颌升支在牙龄IIIA时较细，在牙龄IIIC时明显变细;骨性III类患者髁突在牙龄IIIA ~ IIIC时较骨性I类患者明显延长，下颌角在牙龄III ~ IIIC时较骨性I类患者明显张开。正颌治疗后面部表面的三维变化通过将受试者的头部固定在耳杆上，可以较准确地测量表面的形状。用此方法观察了上颌骨前移后面部表面的变化。结果显示，外翼与鼻翼之间的中上部无明显变化。手术后，鼻子向上和向前移动。结果表明，中国人的鼻子呈扁宽型的趋势.正畸治疗后面部预测系统算法的开发正畸治疗的许多项目的对应关系进行了检查。提出了正畸治疗后的人脸预测算法。通过反复检查、预测、处理和评价，提高了准确性。