Objective: To compare the effectiveness of micro-implant (MI) and conventional anchorage (CA) in vertical control during orthodontic extraction treatment of class II adults and adolescents after pubertal growth peak.
Materials and methods: Literature search was conducted through Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, EMBASE, Web of Science, China National Knowledge Infrastructure (CNKI), Wanfang Database, VIP, China Biology Medicine (CBM), and other sources, from inception to December 2021. Randomized clinical trials (RCTs) and controlled clinical trials (CCTs) were included. Mean differences (MDs) with 95% confidence intervals (CIs) were conducted. A meta-analysis concerning change of mandibular plane, vertical change of upper and lower molar, change of occlusal plane, SNB, chin position, and profile was carried out.
Results: A total of 10,669 records were identified in the database search, and 19 studies (10 RCTs and 9 CCTs) were included in the final analysis. Compared with CA, MI significantly decreased mandibular plane angle and intruded upper molars. No significant difference was found in vertical change of lower molars, occlusal plane, SNB, chin position, and profile.
Conclusion: MI seems to be more effective than CA in vertical control during orthodontic extraction treatment of class II adults and adolescents after pubertal growth peak.
Clinical relevance: MI should be given priority when considering the vertical control of class II patients, which is beneficial to the counterclockwise rotation of mandible or at least prevention of deterioration of the profile.
Keywords: Counterclockwise rotation of mandible; Micro-implant; Orthodontic treatment; Vertical control.
© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.