Animal experimental research on rapid orthodontic tooth movement of whole anterior teeth and premaxillary
AIM: To investigate whether whole anterior maxillary teeth and premaxillary could be distracted rapidly aided by alveolar surgery. METHODS: Bilatery maxillary canines were extracted and anterior maxillary osteotomy was performed in 6 beagles. After cementing the routine tooth-borne appliance,the distraction device was force loaded by 0. 5 mm/d to retract the whole anterior maxillary teeth for 12 d. Three animals were executed immediately after distraction was completed and the other 3 were executed 4 weeks after the fixture. Cephalometric and periapical films were taken before force loading and execution. RESULTS: Tooth and radiograph measurement indicated that the anterior teeth moved 4.54 mm on average and the posterior teeth moved 1.31 mm. The anterior teeth rotated 3.4 degree clockwise. The average skeleton movement was 1.34 mm,but there were big variations between dogs. No apparent complications such as root resorption,loosening of tooth or bone necrosis occurred. CONCLUSION: Alveolar surgery can increase the orthodontic tooth movement of whole anterior teeth,but it has no apparent effect on premaxillary.
NETL
NSTL
万方数据
维普
