Abstract: Objective to investigate the effect of rotating pulsed magnetic field on orthodontic tooth movement in rabbits.Methods 25 white rabbits was randomly divided into 5 groups of  1，3，5，7 and 14 days．Under anesthesia condition by 2％ pentobarbital sodium，the stainless coil springs were fixed between the first maxillary molar and the incisor producing  the  force of  80 g．The Experimental group was treated by rotating pulsed magnetic field and the force,and the control group was only treated by the force.Later,the histological changes of orthodontic alveolar bone and measure the distance of toothmovement were investigated.Resultsthe distance of tooth movement in the experimental group was larger apparently than that in the control group(p<0.05).The histological changes showed that the osteogenesis and osteolysis of the alveolar bone appeared progressively active.Conclusion rotating pulsed magnetic field can promote the orthodontic alveolar remodeling.

Key words: rotating pulsed magnetic field, tooth movement, bone remodeling