Predictability of rotational tooth movement with orthodontic aligners comparing software-based and achieved data: A systematic review and meta-analysis of observational studies

OBJECTIVE: To evaluate all available evidence on the prediction of rotational tooth movements with aligners. DATA SOURCES: Seven databases of published and unpublished literature were searched up to 4 August 2020 for eligible studies. DATA SELECTION: Studies were deemed eligible if they included evaluation of rotational tooth movement with any type of aligner, through the comparison of software-based and actually achieved data after patient treatment. DATA EXTRACTION AND DATA SYNTHESIS: Data extraction was done independently and in duplicate and risk of bias assessment was performed with the use of the QUADAS-2 tool. Random effects meta-analyses with effect sizes and their 95% confidence intervals (CIs) were performed and the quality of the evidence was assessed through GRADE. RESULTS: = 0.48). Risk of bias was unclear to low overall, while quality of the evidence ranged from low to moderate. CONCLUSION: Allowing for all identified caveats, prediction of rotational tooth movements with aligner treatment does not appear accurate, especially for canines. Careful selection of patients and malocclusions for aligner treatment decisions remain challenging.