caa a22 4500 445347864 CHVBK 20180317142834.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00056-011-0042-3 doi (NATIONALLICENCE)springer-10.1007/s00056-011-0042-3 Accuracy of fit of 3-to-3 retainers after adhesive fixation using a neodymium-iron-boron magnet chain [Elektronische Daten] [W. Hahn, W. Wasser-Merkel, K. Lange, R.M. Gruber, D. Kubein-Meesenburg, D. Ihlow] Passgenauigkeit adhäsiv befestigter 3-3-Retainer unter Verwendung einer Neodym-Eisen-Bor-Magnetkette Background and objective: Six-base retainers are often used to prevent tertiary crowding. To minimize shear stress on the retainer, these should be fitted as precisely as possible. The aim of this study was to compare the accuracy of fit of 6-base retainers after adhesive fixation using a neodymium-iron-boron (NdFeB) magnet chain or a resin positioning aid. Materials and methods: A 6-base retainer was prepared for 40pseudo-anonymous lower jaw models (2 × 20). Temporary fixation was performed with a resin positioning aid or a NdFeB magnet chain. The adhesive fixation of the retainers was randomized. The area and vertical distance between wire and teeth were determined by histomorphometry. The results were evaluated by ANOVA. The probability of error was specified as 5%. Results: With the magnetic chain method, the area was significantly smaller than with the positioning aid (p = 0.0125). The difference between the two methods was ca. 1.3mm2. Moreover, the measured distance was affected significantly by the method used (p < 0.0002). With the magnet chain, the distance between the tooth and retainer was reduced by a mean of 0.05mm. Conclusion: The fit of the retainer wire improves somewhat when the NdFeB magnet chain is used even though the wire is not as precisely positioned as it would be with a custom-made positioning aid. Urban &amp; Vogel, Muenchen, 2011 Retainer fixation nationallicence Magnets nationallicence Retainer loss nationallicence Crowding nationallicence Retainerbefestigung nationallicence Magnete nationallicence Retainerverlust nationallicence Engstand nationallicence Hahn W. Department of Orthodontics, Faculty of Medicine, Georg-August University, Robert-Koch-Str. 40, 37075, Göttingen, Germany aut Wasser-Merkel W. Department of Orthodontics, Faculty of Medicine, Georg-August University, Robert-Koch-Str. 40, 37075, Göttingen, Germany aut Lange K. Department of Medical Statistics, Faculty of Medicine, Georg-August University, Göttingen, Germany aut Gruber R.M. Department of Oral and Facial Surgery, Faculty of Medicine, Georg-August University, Göttingen, Germany aut Kubein-Meesenburg D. Department of Orthodontics, Faculty of Medicine, Georg-August University, Robert-Koch-Str. 40, 37075, Göttingen, Germany aut Ihlow D. Department of Orthodontics, Faculty of Medicine, Georg-August University, Robert-Koch-Str. 40, 37075, Göttingen, Germany aut Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Springer-Verlag 72/5(2011-10-01), 381-388 1434-5293 72:5<381 2011 72 56 https://doi.org/10.1007/s00056-011-0042-3 text/html Onlinezugriff via DOI 1 article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00056-011-0042-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hahn W. Department of Orthodontics, Faculty of Medicine, Georg-August University, Robert-Koch-Str. 40, 37075, Göttingen, Germany aut NATIONALLICENCE 700 1- Wasser-Merkel W. Department of Orthodontics, Faculty of Medicine, Georg-August University, Robert-Koch-Str. 40, 37075, Göttingen, Germany aut NATIONALLICENCE 700 1- Lange K. Department of Medical Statistics, Faculty of Medicine, Georg-August University, Göttingen, Germany aut NATIONALLICENCE 700 1- Gruber R.M. Department of Oral and Facial Surgery, Faculty of Medicine, Georg-August University, Göttingen, Germany aut NATIONALLICENCE 700 1- Kubein-Meesenburg D. Department of Orthodontics, Faculty of Medicine, Georg-August University, Robert-Koch-Str. 40, 37075, Göttingen, Germany aut NATIONALLICENCE 700 1- Ihlow D. Department of Orthodontics, Faculty of Medicine, Georg-August University, Robert-Koch-Str. 40, 37075, Göttingen, Germany aut NATIONALLICENCE 773 0- Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Springer-Verlag 72/5(2011-10-01), 381-388 1434-5293 72:5<381 2011 72 56 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer