目的

初步探讨将新标志点应用于分析安氏Ⅲ类骨性错青少年病例上颌前牵引矫治前后硬组织变化的可行性。

方法

选择12 例采用上颌前方牵引方法矫治的骨性Ⅲ类错青少年病例为实验组， 选择12 例骨性Ⅰ类个别前牙反颌未进行上颌前方牵引的青少年病例为对照组，加用上颌窦前后径、上颌窦前壁厚度以及上颌窦中点这三个新标志点对矫治前后的侧位片进行X 线头影测量分析， 其结果经SPSS11.0 统计软件进行配对t检验。

结果

实验组与对照组相比，矫治前后上颌窦前后径平均增加2.25 mm，上颌窦前壁厚度平均增加2 mm（P ＜0.05），上颌窦中点在SN 上的垂足及上颌窦前壁厚度的变化差异无统计学意义（P ＞0.05）。

结论

应用传统的上颌骨测量项目，加上上颌窦中点、上颌窦前后径以及上颌窦前壁厚度这三个新标志点，能更为全面地综合分析上颌骨的变化。

Objectives

To study the changes of hard tissue before and after orthodontic treatment for Angle's Class Ⅲmalocclusion adolescence patient with front traction in maxillary by using three new points in cephalometric analysis.

Methods

12 cases of Angle's Class Ⅲmalocclusion adolescence patients were treated by front traction in maxillary， another 12 cases of Angle's Class Ⅰmalocclusion adolescence patients were included as the control group without treatment. Cephalometric analysis was carried out before and after the treatment. Data were analyzed by SPSS11.0 software using paired t-test.

Results

There were significant increases in anteroposterior diameter and thickness of maxillary sinus （P ＜0.05）， while there was no significant change in the centre of maxillary sinus （P ＞0.05）.

Conclusions

It is a feasible approach to study the changes of hard tissue for malocclusion adolescence patient by using three new points of maxilla in cephalometric analysis.