Establishment of animal experimental model on orthodontic rapid tooth movement through distraction osteogenesis of periodontal ligament

Objective: To explore method of reducing resistance and distracting by setting up experimental model of rapid tooth movement. Methods: Eight native healthy hybrid dogs were selected in the study. The thickness of interseptal bone between the extracted tooth and moved tooth was groud by half to reduce the resistance when the first premolar was to be pulled out, then the self-made distraction device was bound on the moved tooth and anchor tooth immediately. It was activated 0.25 mm every 12 hours and twice a day. The groups were activated for 14 days, and the device was fixed by the ligature wire. During the experiment, the distance of the tooth movement was measured every week. Results: Circled digit one The distracted tooth moved by the mean distance of 4.54 mm during 14 days, and the anchor tooth moved by 0.45 mm on average (P<0.01). Circled digit two There was no loosening in tooth apical, and pulp and pressure-side tissue necrosis and distraction-side bone defect were not found during the experiment. Conclusion: The tooth movement can be increased through the reduction of bone resistance with grinding half interseptal bone and grooving socket in extracted socket base.