Comparative study of double chain method and micro implant anchorage with straight wire appliance on orthodontic tooth gap closure

Objective To explore the effect of double chain method support on the closure of orthodontic tooth gap. Methods From June 2014 to June 2017, 72 patients of orthodontic patients with different maxillary and mandibular dentition clearances were randomly selected in Department of Stomatology, Affiliated Hospital of Chengde Medical College. The patients were randomly divided into the research group and the control group (n=36) according to the digital table. The control group patients all implants using micro technology with straight wire bow correction. The patients in the study group were treated with double chain method. The time required for tooth gap closure, periodontal index and complications in the two groups was recorded. Results The mean time of the closing time of tooth extraction clearance in the research group and in the control group were (4.19±0.76) and (5.34±0.56) months. The research group was shorter than the control group (t=7.309, P 0.05), while the research group of the PLI index was significantly better than control group, the difference was statistically significant (t=5.428, all P values<0.01). The incidence of complications in the research group was 2.78%(1/36), the control group was 13.89%(5/36), the difference was statistically significant(χ2=22.500, P<0.01). Conclusions In orthodontic therapy, double chain method to close the orthodontic tooth gap has shorten the time, it is good for the health of periodontal tissue and reduce the incidence of complications.So it is worthy of clinical promotion. Key words: Orthodontic space closure; Double chain method; Micro implant; Direct silk arch technique