| Objectives:To synthesize currently existing data and evaluate the effectiveness of micro-implant and traditional anchorage in patients with maxillary protrusion during anterior teeth retraction in China. Methods:Three electronic databases in China which consist of CNKI(2000.01-2009.09),CQVIP(2000.01-2009.9)and Chinese Biomedical Literature Database Web Edition(2000-2009)were searched.Controlled clinical trials and randomized clinical trials that compared micro-implant and traditional anchorage were selected for inclusion.Validity and quality assessment were undertaken to identify studies with a low risk of bias.Three major aspects including the overjet, the inclination of the incisor and molar movement distance were analyzed with Meta-analysis by using Rev-Man4.2 software.Results:Ten trials (6 RCTs and 4 non-RCTs) were eligible for inclusion in this evaluation after applying specific inclusion and exclusion criteria. The general methodological qualities of most of the trials are relatively poor. Meta-analysis demon-strated that:(1)Seven trials indicate that there was a significant difference between the Micro-implant and the traditional anchorage technique in the maxillary incisor retraction [P<0.0001,WMD=1.23,95%CI(0.70,1.76)];(2) Six trials indicate that there was a significant difference between the Micro-implant and the traditional anchorage technique in the inclination of the maxillary incisor changed [P<0.0001,WMD=2.68,95%CI(1.57, 3.79)];(3)Seven trials indicate that there was a significant difference between the Micro-implant and the traditional anchorage technique for mesial movement of the maxillary molars[P=0.0001,SMD=-2.81,95%CI(-4.26,-1.37)].Conclusions:Compared to the traditional technique,the Micro-implant anchorage technique can decrease the overjet and overbite of the incisor to a greater extent, bring smaller mesial movement of the maxillary molars less anchorage loss and provide more space for the retraction of the incisors.
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