Abstract: Objective： To investigate the clinical effect of different implantation methods on orthodontic im- plants with micro implant anchorage screws. Methods： A total of 70 patients who were treated with orth- odontic treatment from April 2015 to January 2017 were selected as subjects. All patients were treated with mini-implantation anchorage. According to the implantation method, they were divided into control group and observation group, each with 35 cases. In the control group, the microscrew implants were im- planted at a vertical angle of 90 degrees. The observation group was treated with a microscrew implant an- chorage method. The effect of the implants was assessed 12 months after treatment. The two groups of pa- tients were recorded and statistically evaluated for the lower-middle incisor lip inclination angle, uppermiddle incisor lip inclination, and upper and lower mid-tooth incisional teeth angles. The occlusal force was measured before and after the patient's treatment of occlusal force, the chewing efficiency was evalu- ated using a weighing method. Evaluation, records and statistics of implant loosening, periodontal edema, discomfort, and incidence of gingivitis after treatment were compared between the two groups. Clinical ef- ficacy was compared between the two groups. Results： The 12-month curative effect of micro-screw im- plant anchorage in the observation group was 94.29%, which was higher than 68.57% in the control group (P<0.05). The inclination of tooth lip was smaller than that of the control group(P<0.05). In the observa- tion group, the angles of the upper and lower mid-incision teeth in the 12 months after treatment were all greater than those in the control group (P<0.05), the chewing function was not statistically significant be- fore treatment in the two groups(P>0.05), observing force and chewing efficiency were higher in the obser- vation group than in the control group at 12 months after treatment (P<0.05), implant group loosening, periodontal edema, discomfort, and incidence of gingivitis were observed in the observation group after treatment. Lower than the control group(P<0.05). Conclusion： The use of microscrew implant anchorage in orthodontic treatment can improve the clinical curative effect, improve the inclination of the lip and the chewing function, and the complication rate is low. It is worthy of popularization and application.

Key words: microscrew implantation, vertical 90-degree implant therapy, orthodontic treatment, tooth angle, complication