Systematic reviews in orthodontics: What have we learned?

Abstract

The literature is becoming replete with systematic reviews of orthodontic-related topics. However, their findings have not been appraised and summarised collectively. Methods: Systematic reviews related to orthodontics published between 1 January 2000, and 31 January 2007 were identified and reviewed. Results: Fifty-one orthodontic systematic reviews were identified in the defined period. A highly significant percentage of reviews (29%) failed to reach conclusions. Conclusions were made in the remaining reviews although many relied on secondary levels of evidence to do so. In this narrative review the findings from these studies are summarised. Conclusions: Systematic reviews in orthodontic-related areas have produced some interesting findings. However an unacceptably high number continue to be inconclusive, reflecting methodological inadequacies of the review process and exposing inadequacies in our evidence base. © 2008 FDI/World Dental Press.