颌间Ⅲ类矫形力对青春期恒河猴颌骨长度变化的影响

Effect of Class Ⅲ intermaxillary functional orthopedic force on maxillary and mandibular length in pubescent rhesus monkeys

目的:探讨颌间Ⅲ类矫形力对恒河猴上、下颌骨长度改变的影响。方法:选用青春发育期恒河猴6只,实验组4只,对照组2只。实验动物分别于上颌骨颧额缝、颧颞缝、颧颌缝两侧,下颌骨髁突颈、下颌角及颏下点打银汞合金标记点。实验组戴颌间Ⅲ类双阻板磁力矫冶器,对照组不戴。矫治前、后拍头颅侧位片。矫治前、处死动物后测量标记点间距离的变化,对相关数据进行测量分析。结果:与对照组相比,实验组矫治前、后上颌骨长度明显增加,颧额缝、颧颞缝、颧颌缝间距增宽;下颌骨长度未见明显变化。结论:颌间Ⅲ类矫形力可促进上颌骨生长发育,抑制下颌骨水平向生长。

PURPOSE： To study the effect of Class Ⅲ intermaxillary functional orthopedic force on the change of pubescent rhesus monkey＇s maxilla and mandible.METHODS： Six pubescent rhesus monkeys were randomly divided into experimental（4 monkeys） and control（2 monkeys） groups.Monkeys in the experimental group wore TMA Ⅲ while the control group did not.Cephalometric radiographs were taken and analyzed before and after treatment.The distance between two relative marks of Hg-Ag alloy was measured.RESULTS：Compared with the control group,cephalometric results showed that the maxillary length increased,but the mandibular length changed little in the experimental group.CONCLUSION： Class Ⅲ orthopedic force could accelerate the growth of maxilla and inhibit the development of mandible.