关键词: 功能矫治器, 安氏Ⅱ类错, 髁突, Meta分析, 系统评价

Abstract: Objective This study aimed to analyze the condylar position changes produced by functional appliances inclass Ⅱ malocclusion by systematic review. Methods Electronic search was conducted using Chinese Biomedical LiteratureDatabase, China National Knowledge Infrastructure, VIP Database for Chinese Technical Periodicals, Medline, Embase, Pubmed, and Cochrane Central Register of Controlled Trials. Studies on condylar position changes produced by functionalappliances in class Ⅱ malocclusion were included. Risk of bias assessment and data extraction of included studies were conductedby two reviewers independently. The meta-analysis was carried out using Revman 5.1. Results Six studies wereincluded (five high quality and one low quality). The condylar position showed no changes after Herbst treatment. The condylarposterior space after Twin-block treatment averagely increased by 0.31 mm (P<0.000 01), whereas the condylar anteriorspace averagely reduced by 0.32 mm (P<0.000 01). Conclusion Twin-block appliance enables forward movement of thecondylar position. This result contributes to the correction of class Ⅱ malocclusion.

Key words: functional appliance, angle class Ⅱ malocclusion, condyle, meta-analysis, systematic review