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Fabrication of cranio-facial soft tissue model by rapid prototyping and its clinical application.

颅面部软组织模型快速成型制作及其临床应用

基本信息

批准号：
12470410
负责人：
OKUDA Kouichi
金额：
$ 8.96万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

1. ObjectiveOrthognathic surgery has been widely performed to improve function and esthetics of patients suffering from jaw deformity. We have applied rapid prototyping (RP) technology to fabricate 3-dimensional cranio-facial bone models from 3D-CT data and the models have been used for presurgical simulation. However, post-operative relapse usually takes place due to tension from distorted soft tissues and muscles. Therefore, the purpose of this study was to fabricate simulation models including soft tissue in order to evaluate soft tissue change before and after surgery.2. Materials and MethodsThe masseter was modelled because masticatory muscles, especially the masseter, are supposed to have strong influence on postoperative relapse. Among patients underwent sagittal split or vertical ramus osteotomy, those who met the following criteria were included as subjects ; 1)no maxillary surgery or limited blow the zygomatic and nasal bones, 2)Preoperative CT taken after growth period was over and postoperative CT taken within 6 months after surgery are available. The masseter data was extracted from each CT slice. The long axis of the masseter was defined as a regression line of the center of gravity of the masseter on each slice. The change of the masseter muscle angluation was evaluated by the angle between the reference axes before and after the surgery.3.ResultsThe long axis of the masseter muscles tended to tilt slightly to the posterior direction after surgery. However, if the technical errors regarding the scanning angle and the reference axes determination are taken into account, it can be concluded that the distortion of the masseter muscles, was minimal. The method used in this study would be inaccurate when the difference between the CT scanning angles taken pre and postoperatively was large. Therefore, in order to evaluate soft tissue changes more accurately, it may be necessary to strictly standardize pre and postoperative CT scanning conditions.

1.为了改善颌骨畸形患者的功能和美观，颌骨外科手术已被广泛应用。我们应用快速原型（RP）技术根据3D-CT数据制作三维颅面骨模型，并将该模型用于手术前模拟。然而，术后复发通常是由于扭曲的软组织和肌肉的张力。因此，本研究的目的是制作包含软组织的仿真模型，以评估手术前后软组织的变化.材料与方法由于咀嚼肌，尤其是咬肌，对术后复发有很大的影响，因此我们以咬肌为模型。在接受矢状劈开或垂直升支截骨术的患者中，符合以下标准的患者被纳入为受试者：1）未进行上颌骨手术或对颌骨和鼻骨进行有限打击，2）术前CT在生长期结束后进行，术后CT在术后6个月内进行。从每个CT切片中提取咬肌数据。咬肌长轴定义为咬肌重心在各层面上的回归线。结果术后咬肌长轴有轻微后倾的趋势，术后咬肌长轴有轻微后倾的趋势。然而，如果考虑到关于扫描角度和参考轴确定的技术误差，则可以得出结论，咬肌的变形是最小的。当术前和术后CT扫描角度差异较大时，本研究中使用的方法将不准确。因此，为了更准确地评估软组织变化，可能有必要严格规范术前和术后CT扫描条件。