前牙残根冠向正畸牵引研究模型的建立

Establishment of an animal model for orthodontic extrusion of anterior residual roots in dogs

目的建立前牙残根冠向正畸牵引研究模型。方法选择3只健康成年杂种犬,随机选取一侧上颌侧切牙作为实验组,对侧上颌侧切牙为对照组。制造残根模型,安装自制残根冠向正畸牵引装置。每日观察装置保留情况,分别于第0、30天时记录探诊深度、探诊出血等牙周临床指标。结果 30天后装置保存率100%;对照组与实验组牙周临床指标无统计学差异;实验组残根平均牵出(1.22±0.12)mm,对照组移动(0.15±0.06)mm,P<0.05。结论本文建立的动物模型对牙周组织影响小,是一种稳定、高效、简便易行的残根冠向正畸牵引研究模型。

Objective To establish an animal model for orthodontic extrusion of anterior residual roots in dogs. Methods： Three healthy adult hybrid dogs were selected for this study. Two maxillary lateral incisors from each dog were used,one for oIthodontic trac- tion, the other for control randomly. The models for residual roots were established, and orthodontic traction devices were installed. The stability of the devices was observed every day,and periodontal indicators were recorded at 0 and 30th day. Results The survival rate of the orthodontic devices was 100%. There was no significant difference between the experimental group and control group in periodon- tal status. The residual roots were pulled out by （ 1.22 ± 0.12） mm on average, while the control group moved （0.15 ±0.06） mm on av- erage. Conclusions The present animal model for orthodontic extrusion of anterior residual roots is stable, efficient, and easy to oper- ate. Also, it hardly influences the periodontal status.