| Objective:Taking measurement of meta-analysis to compare the effects of maxillary protraction with Alternate Rapid Maxillary Expansions and Constrictions(Alt-RAMEC)versus simply Rapid Maxillary Expansion(RME)on class III malocclusion caused by maxillary deficiency.Methods:Supplemented with manually retrieve,research results relating to Alt-RAMEC and published before March 2017,were searched comprehensively from computer database such as PubMed,Embase,CENTRAL,CNKI,CBM,Wanfang etc..The results were filtered in accordance with inclusion and exclusion criteria strictly and evaluated upon their quality.Odds ratios(ORs)with 95% confidence intervals(CIs)calculated in fixed or random-effects models were used to estimate the treatment effect,followed by sensitivity analysis,subgroup analysis and publication bias test.Results:Eventually,a total of 175 patients,five research articles were covered under this study,including two randomized controlled trials and three clinical controlled studies.The research shows a statistical difference on SNA’s change in the method of Alt-RAMEC against RME.Subgroups were analyzed on a duration basis.When the rapid expansion lasts no more than 6 weeks,no statistical difference were observed in SNB,PP,MP.Whereas the treatment lasts 7 weeks,statistical differences were found between these two therapies.Four studies reported non-statistical-difference on the changes of upper and lower incisor angle in these two therapies.Conclusion:Studies have shown that Alt-RAMEC can promote much more forward movement of the maxillary than RME.In a short run,maxillary protraction with Alt-RAMEC is effective to treat Class III Malocclusion.But the long term effectiveness asks for further researches.Limited by the quantity and quality of the selected articles,as well as the undone assessment for the long-term stability,the effectiveness of Alt-RAMEC shall be further examined by a large sample,high-quality and long-term follow-up RCT test. |
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