Abstract
Purpose Evaluation of tooth movement after retainer debonding in retainer-associated misalignment cases. Methods This pilot study is based on a retrospective data analysis. Adult patients (age 25.5 +/- 4.9 years) wearing fixed twistflex retainers and having visible retainer-associated misalignment were included and examined for tooth movement after retainer debonding. Orthodontic study models ...
Abstract
Purpose Evaluation of tooth movement after retainer debonding in retainer-associated misalignment cases. Methods This pilot study is based on a retrospective data analysis. Adult patients (age 25.5 +/- 4.9 years) wearing fixed twistflex retainers and having visible retainer-associated misalignment were included and examined for tooth movement after retainer debonding. Orthodontic study models were taken at retainer debonding (t0) and 14 (+/- 1) weeks later (t1). They were digitally superimposed using 2D/3D dental imaging software and tooth movement was analyzed in all three dimensions. Results A total of 23 teeth (12 upper teeth: 10 incisors, 2 canines; 11 lower teeth: 7 incisors, 4 canines) were analyzed. Mean overall tipping was 1.11 +/- 0.82 degrees in the mesial/distal direction (angulation, x-axis), 2.02 +/- 1.9 degrees in the buccal/lingual direction (inclination, y-axis) and 1.28 +/- 0.99 degrees around the tooth axis (z-axis). Mean overall bodily movement was 0.30 +/- 0.31 mm in the mesial/distal direction (angulation, x-axis), 0.10 +/- 0.13 mm in the buccal/lingual direction (inclination, y-axis), and mean in- or extrusion 0.22 +/- 0.24 mm (z-axis). Mean tipping and bodily movement were more pronounced in the upper jaw. Conclusion The present data shows that tooth movement after debonding of twistflex retainers can be expected in misalignment cases.
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