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Meta analysis of the treatment-related factors of external apical root resorption
G R Segal1, P H Schiffman, O C Tuncay
1Department of Orthodontics, Temple University, Philadelphia, PA, USA. sgrsegal@aol.com
Objective:
To elucidate possible treatment-related etiological factors--such as, duration of treatment and apical displacement--for external root resorption.
Design:
Meta-analysis of the available English-language literature.
Inclusion & Exclusion Criteria:
Papers with a sample size > 10, fixed appliances, pre- and post-operative radiographs, and apical displacement recorded were included. History of trauma, prior root resorption and endodontic treatment were excluded. Appropriateness of these selections was tested with a 'funnel plot' analysis.
Outcome Measure:
Correlations between root resorption, apical displacement, and treatment duration.
Results:
Mean apical root resorption was strongly correlated with total apical displacement (r = 0.822) and treatment duration (r = 0.852).
Conclusion:
The treatment-related causes of root resorption appear to be the total distance the apex had moved and the time it took.
