论文部分内容阅读
采用固定矫治器对西安地区２０例乳牙期反合患者进行治疗，借助扫描Ｘ线头影测量系统，对术后上颌骨、乳切牙及恒切牙胚进行了观察和测量研究。结果提示：上颌骨平均水平向前移动了２．４０ｍｍ，平均垂直向下移动了０．８２ｍｍ（Ｐ＜０．０５），乳切牙平均向前移动了１．１３ｍｍ（Ｐ＜０．０１），Ｇ点平均前移１．６６ｍｍ，而Ｇ点以ＦＨ平面作参照平均向下移动１．６１ｍｍ（Ｐ＜０．０５）。硬组织的改变使相应的软组织显著发生变化，使反合患者的面型得到较大的改善。在上颌骨、乳切牙明显向前移动的同时，继承恒牙胚的位置也相应向前和向下方移动。此表明，乳牙反合的固定矫治对预防恒牙期再度出现反合有临床意义。
The fixed appliance was used to treat 20 cases of deciduous period anti-synosis in Xi'an. The maxillary, primary incisor and permanent tooth germ were observed and measured by scanning X-ray cephalometric system. The results suggest that the maxillary average level moved forward 2.40mm, the average vertical downward movement of 0.82mm (P <0.05), the average number of primary incisors moved 1.13mm (P <0.01) , The average G point forward 1.66mm, while the G point to the FH plane as an average down 1.61mm (P <0.05). Changes in hard tissue so that the corresponding significant changes in soft tissue, so that the patient's face to get a greater improvement. In the maxillary, breast incisors move significantly forward at the same time, the location of inherited permanent tooth germ corresponding forward and downward movement. This shows that the fixed correction of primary deciduous teeth to prevent recurrence of permanent dentition has clinical significance.