中文摘要：

目的 评估使用功能矫治对安氏Ⅱ类错畸形患者髁突位置的影响。方法 检索中国生物医学文献数据库、中国知网、维普、Medline、荷兰医学文摘、Pub Med、Cochrane图书馆临床随机对照试验库,纳入所有使用功能矫治器对安氏Ⅱ类错畸形患者进行矫治并评估髁突位置变化的临床对照研究。2位评价者独立对纳入文献进行偏倚风险评价并提取数据,运用Revman 5.1软件进行统计分析。结果 最终纳入文献6篇,共6项研究（5项高质量研究,1项微低质量研究）。与治疗前相比,Herbst矫治器治疗后关节间隙无明显改变,而使用Twin-block矫治器治疗后关节后间隙平均增加0.31 mm（P〈0.000 01）且关节前间隙平均减少0.32 mm（P〈0.000 01）。结论 Twin-block矫治器可以使髁突位置前移,改善Ⅱ类磨牙关系。

英文摘要：

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