Objective To analyze the clinical outcome of microimplant screw-assisted maxillary rapid arch expansion in patients with Class Ⅲ malocclusion.Methods A total of 58 patients with Class Ⅲ malocclusion treated at Handan Stomatological Hospital from January 2022 to April 2023 were selected as the control group,and surgically assisted rapid maxillary arch expansion treatment was used.A total of 58 patients with Class Ⅲ malocclusion treated at Handan Stomatological Hospital from June 2023 to May 2024 were se-lected as the observation group,and micro-implant assisted rapid maxillary arch expansion treatment was performed.After 3 months of treatment,cone beam CT was taken to compare the bone structure,soft tissue measurement results,occlusal function,arch expansion effect,and postoperative complications between the two groups of patients before and after treatment.Results The bony width and the tilt of the supported teeth of the maxillary teeth increased in both groups after treatment,compared with the preoperative period(P＜0.05).The nasal width of the maxillary first molar in the observation group increased significantly,and the tilt of the supported teeth were all reduced significantly compared with the control group(P＜0.05).After treatment,ANB and LI-MP of the observation group were higher than those of the control group;SNB and MP-SN were lower than those of the control group.Facial convexity angle and na-solabial angle were higher than those of the control group;chin-labial angle was lower than those of the control group,and occlusal function was higher than those of the control group(P＜0.05).The postoperative complication rate of 1.72％in the observation group was lower than that of 13.79％in the control group,with a significant difference(P＜0.05).Conclusion Micro-implant-assisted rapid maxillary arch expansion can achieve obvious bony expansion effect,promote the improvement of the patient's bony structure,improve their facial morphology,and enhance their occlusal function,which can be promoted and applied.

Objective To analyze the clinical outcome of microimplant screw-assisted maxillary rapid arch expansion in patients with Class Ⅲ malocclusion.Methods A total of 58 patients with Class Ⅲ malocclusion treated at Handan Stomatological Hospital from January 2022 to April 2023 were selected as the control group,and surgically assisted rapid maxillary arch expansion treatment was used.A total of 58 patients with Class Ⅲ malocclusion treated at Handan Stomatological Hospital from June 2023 to May 2024 were se-lected as the observation group,and micro-implant assisted rapid maxillary arch expansion treatment was performed.After 3 months of treatment,cone beam CT was taken to compare the bone structure,soft tissue measurement results,occlusal function,arch expansion effect,and postoperative complications between the two groups of patients before and after treatment.Results The bony width and the tilt of the supported teeth of the maxillary teeth increased in both groups after treatment,compared with the preoperative period(P＜0.05).The nasal width of the maxillary first molar in the observation group increased significantly,and the tilt of the supported teeth were all reduced significantly compared with the control group(P＜0.05).After treatment,ANB and LI-MP of the observation group were higher than those of the control group;SNB and MP-SN were lower than those of the control group.Facial convexity angle and na-solabial angle were higher than those of the control group;chin-labial angle was lower than those of the control group,and occlusal function was higher than those of the control group(P＜0.05).The postoperative complication rate of 1.72％in the observation group was lower than that of 13.79％in the control group,with a significant difference(P＜0.05).Conclusion Micro-implant-assisted rapid maxillary arch expansion can achieve obvious bony expansion effect,promote the improvement of the patient's bony structure,improve their facial morphology,and enhance their occlusal function,which can be promoted and applied.