Study on the differences of reconstructive and normal periodontium under the orthodontic force

Objective To investigate the differences of tooth movement under orthodontic forces between reconstructed and normal periodontal tissues,and to explore the feasibility of enamel matrix protein in orthodontic treatment of periodontal diseases.Methods Forty-two female SD rats were chosen for experiment animals,and the bilateral maxillary first molars were divided into the periodontal regeneration group and the control group.Severe periodontitis model in the periodontal regeneration group were made by ligation wire,and then enamel matrix proteins were used to induce periodontal regeneration.After successful reconstruction,orthodontic forces were used to move the maxillary first molars.After four weeks,the distances of the tooth movement were measured and statistical analyzed.Results There was no statistical significance in the mesial movement distance of the first molar between two groups(P 0.05).Conclusion The reconstructed periodontal tissue show ed good mechanical reaction,and enamel matrix protein can be applied to the teeth with severe periodontitis before orthodontic treatment.