Growth prediction of mandible by using a computed X-ray densitometry method

使用计算 X 射线密度测定法预测下颌骨生长

基本信息

批准号：
05454552
负责人：
MITANI Hideo
金额：
$ 4.42万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05454552/
关键词：
bone mineral density CXD method mandibular growth SIGMA GS D hand bone X-ray late adolescent period second metacarpal bone maturity indicator 下顎骨全体長身長重回帰分析成長予測アルミニウム階段初経パーソナル・コンピュータ

项目摘要

The purpose of this study was to examine the relationship between mandibular growth and the value of bone mineral density by using computed X-ray densitometry (CXD) method. All of subjects consisted of 199 girls and 68 boys aged from 6 to 19 years at initial stage. The materials used were serial hand bone X-rays taken with an aluminum step-wedge ruler, lateral cephalograms and standing height data. The following annual increments were obtained-Cd-Go, Go-Pog', Cd-Gn from cephalograms, SIGMA GS/D,GSmax, GSmin, MCI,D,d, L from second metacarpal image by using "Bonalyzer" (Teijin Ltd.).Results were as follows :1. It indicated that peak velocity of SIGMA GS/D was about 2-year later than that of D,L and standing height, and 1-year around menarche in girls.2. There were significantly positive correlation coefficients between annual increments of total mandibular length and that of standing height, SIGMA GS/D,D and L during puberty.3. It showed no correlation between facial type and value of SIGMA GS/D.4. In girls, it significantly showed negative correlation between annual increment of total mandibular lengh and three parameters (SIGMA GS/D,MCI and L) at initial stage, and in boys, only SIGMA GS/D showed negative correlation during puberty. But both of them, there was no correlation before puberal growth period.From multiple regression analysis with annual increments of mandible as criterion variable and paraneters of CXD method as predictor variables were applied, it should that multiple correlation coefficients was 0.7-0.9 in late adolescent period in boys.When multiple regression equation was applied, the error between true annual increments of mandible and predicted value were 0.5-1.0 mm in girls, and 1.0-2.0 mm in boys.Above all, it indicated that the parameters obtained by CXD method were useful for the evaluation of individual skeletal maturation and mandibular growth potentiality in later adolescent period, especially in boys.

本研究的目的是通过计算X射线密度测定（CXD）方法检查下颌生长与骨密度值之间的关系。初始阶段所有受试者包括 199 名女孩和 68 名男孩，年龄范围为 6 至 19 岁。使用的材料是用铝制阶梯楔尺拍摄的连续手骨 X 射线、头颅侧位照片和站立高度数据。使用“Bonalyzer”（Teijin Ltd）从头颅照片获得以下年度增量 - Cd-Go、Go-Pog'、Cd-Gn，从第二掌骨图像获得 SIGMA GS/D、GSmax、GSmin、MCI、D、d、L .).结果如下：1．表明SIGMA GS/D的峰值速度比D、L和站立高度晚2年左右，女孩月经初潮前后1年左右。 2．青春期下颌全长年增量与站立高度、SIGMA GS/D、D、L呈显着正相关。3．面部类型与SIGMA GS/D.4值之间没有相关性。女孩初始阶段下颌总长年增量与三个参数(SIGMA GS/D、MCI和L)呈显着负相关，男孩青春期仅SIGMA GS/D呈负相关。但二者在青春期之前均不存在相关性。以下颌骨年增量为标准变量、CXD法参数为预测变量的多元回归分析可知，青春期后期的多重相关系数应为0.7~0.9。应用多元回归方程，女孩下颌骨真实年增量与预测值的误差为0.5~1.0 mm，女孩下颌骨真实年增量与预测值的误差为1.0~2.0 mm。综上所述，表明CXD方法获得的参数对于评估个体尤其是男孩青春期后期骨骼成熟度和下颌生长潜力具有重要意义。