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Cone-beam computed tomographic evaluation of the long-term effects of orthodontic retainers on marginal bone levels

Journal article
Authors Anna Westerlund
C. Oikimoui
Maria Ransjö
Annika Ekestubbe
A. Bresin
Henrik Lund
Published in American Journal of Orthodontics and Dentofacial Orthopedics
Volume 151
Issue 1
Pages 74-81
ISSN 0889-5406
Publication year 2017
Published at Institute of Odontology, Section 1
Institute of Odontology, Section 3
Pages 74-81
Language en
Subject categories Dentistry


Introduction Fixed retainers are widely used after orthodontic treatment, sometimes for extended periods, despite insufficient knowledge of their possible long-term adverse effects on the periodontium. The aim of this study was to evaluate whether bonded orthodontic retainers have an adverse long-term effect on the marginal bone levels of the mandibular front teeth. Methods The study included 62 consecutive patients in 3 groups: (1) patients who underwent orthodontic treatment and wore a fixed retainer for 10 years, (2) patients who underwent orthodontic treatment but did not have a fixed retainer, and (3) untreated controls. The marginal bone levels were measured by cone-beam computed tomography 10 years after treatment. Additionally, multivariate data analysis was used to analyze possible correlations between the marginal bone levels at 10 years and the variables obtained from the study casts and profile radiographs. Results The results demonstrated a significantly lower marginal bone level on the buccal side of the mandibular front teeth in the orthodontically treated patients compared with the orthodontically untreated group. There was no difference in the marginal bone levels between the retainer group and the no-retainer group. Multivariate analysis indicated that a low marginal bone level was correlated with a basal open vertical relationship, posterior rotation of the mandible, pretreatment of the incisor protrusion, and extraction therapy. Conclusions Within the limits of this research design, the long-term retention phase in general does not seem to cause any adverse effects on the marginal bone levels after 10 years. © 2017 American Association of Orthodontists

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