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Objective : In the orthodontic process , we should rearrange the teeth , alveolar bone absorption and recycling needs , this is a slow process, some studies show that the mechanical action of orthodontic force , teeth, periodontal tissue , alveolar bone etc. will change accordingly . In either case subject to certain factors will make the correction process to accelerate and slow down . For orthodontic doctors, without affecting its efficacy on the basis if they can shorten the course of treatment , to reduce the suffering of patients is always our goal. This approach has now done a lot of research , but local injection of orthodontic tooth periodontal 1,25 - (OH) 2 D 3 is to promote the positive abnormal tooth movement at home and abroad also rarely reported , and no similar reports made ??from a pathological point of specific research , nor after injection rate of orthodontic tooth movement , the distance to make a horizontal comparison . This experiment by observing 1,25 - (OH) 2 D 3 in rat maxillary palatal injection orthodontic tooth after orthodontic tooth movement , to understand whether the facilitate orthodontic tooth movement for clinical orthodontic topical 1,25 - (OH) 2 D 3 to facilitate orthodontic tooth movement , provide useful experimental basis . Methods: Healthy female 20 weeks 80 SD rats , weighing 200-220 grams. Randomly divided into 8 groups of 10 . A group, simple afterburner one day ; 2 groups, local injection of vitamin afterburner 1 day D; 3 group, simple afterburner three days ; 4 groups, afterburner 3 days local injection of vitamin D; 5 group, simple afterburner 7 days ; 6 groups, afterburner 7 days of local injection of vitamin D; 7 group, simple afterburner 14 days ; 8 groups, afterburner 14 days local injection of vitamin D. The group intends to 1% sodium pentobarbital anesthesia , each group were left maxillary first molar and placed between the upper left central incisor plus
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