关于牙齿近中移动的实验研究

目的　通过动物实验对牙齿近中移动的发生机制进行探讨。方法　以五指山系小型猪上下颌第一磨牙为实验对象 ,通过模型测量分析实验牙近中移动情况 ,以二甲酚橙和盐酸四环素作荧光标记进行组织学观察。结果　下颌有、无对实验牙 ,16周移动量分别为 0 14mm和 1 2 1mm ,上颌实验牙 2 4周移动量分别为 1 36mm和 2 0 8mm。实验牙远中牙槽骨可见荧光标记 ;无对实验牙在垂直方向上有牙槽骨改建发生 ;下颌无对实验牙较有对实验牙远中牙槽骨荧光带间距离大 ;近远中牙骨质都有荧光带形成。结论　实验结果不支持越隔纤维作用或磨牙萌出力作用引起牙齿近中移动的观点 ;牙齿近中移动与颌骨内应力分布有关 ,牙槽骨改建的量与牙齿近中移动量呈正相关

An experimental study of tooth mesial migration

Objective To study the mechanism of tooth mesial migration with animal experiment Methods The upper and lower first molars of Wuzhishan miniature pigs were used as experimental teeth The mesial migration of experimental teeth was calculated and analysed by measuring the models Fluorescent mark was used and analysed by injecting tetracycline and xvlenol orange, and histological changes were analyzed Results The lower teeth migrate mesially 0 14 mm and 1 21 mm during 16 weeks, and the upper teeth migrate mesially 1 36 mm and 2 08 mm during 24 weeks The distal alveolar bones of experimental teeth had fluorescent bands; alveolar bones of teeth without antagonist teeth reconstructed in vertical direction; the distance between fluorescent bands of lower experimental teeth without antagonist teeth was wider than that of teeth with antagonist teeth The fluorescent bands formed in both mesial and distal cementum Conclusion The results don't support the point that transseptal fibre or force of molar eruption makes teeth migrate mesially; the mesial migration of teeth is related with the reconstruction of alveolar bones and the stress distribution in the bones