西安交通大学学报（医学版）2011，Vol.32Issue(6)：787-789,3.
大鼠前牙扭转移动后保持期动物模型的建立
Establishment of rat retention model in incisors
摘要
Abstract
Objective To establish an experimental orthodontic movement of anterior teeth in rats and analyze the relationship between retention duration and relapse distance. Methods Totally 36 female SD rats were provided for the experiment and divided into 6 groups with 6 rats in each. Maxillary central incisors were anchored to each other and a continuous force of 20 g was applied for 10 days so as to rotate the root of both the maxillary incisors in the animal models. After the rotation was completed, orthodontic ligation wire of a diameter of 0.25 mm was used to retain the tooth in rotated position. Rats in each group were maintained to continue retention for 1, 4, 7, 14 and 21 days respectively and the retention wire was removed, but in the control group no retention was done. The distance between the two maxillary central incisors was measured after 7 days of removal of appliances. The effectiveness of devices for retention was studied by the relationship between duration of maintaining retention appliance and the relapse of tooth movement distance and calculated as the distance difference of tooth and length of ligation wire used for retention. Results Post-retention distance in each experimental group was (1.95±0.30), (0.84±0.06), (0.69±0.03), (0.32±0.10) and (0. 09±0. 04)mm, which was significantly less than that in the control group (2.57±0.08)mm (P＜0.05). Conclusion Orthodontic ligature wire with a diameter of 0.25mm can be used as a fixed retainer to keep the anterior teeth to avoid relapse after orthodontic tooth movement in rats for the retention period in the animal model.关键词
扭转牙/前牙扭转移动后保持/正畸/牙根扭转动物模型/复发距离/大鼠Key words
rotated teeth/retention after anterior tooth rotation/orthodontic/animal model of rotating the root of both the maxillary incisors/relapse distance/rat分类
医药卫生引用本文复制引用
崔淑霞,朱凤节..大鼠前牙扭转移动后保持期动物模型的建立[J].西安交通大学学报（医学版）,2011,32(6):787-789,3.基金项目
郑州市二七区科技局基金资助项目(No.20103373) （No.20103373）
