The retention characteristics of Hawley and vacuum-formed retainers with different retention protocols

Ramazanzadeh, B. and Ahrari, F. and Hosseini, Z. S. (2018) The retention characteristics of Hawley and vacuum-formed retainers with different retention protocols. Journal of Clinical and Experimental Dentistry, 10 (3). e224-e231.

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Abstract

Background: This study aimed to compare the effectiveness of two different protocols of wearing vacuum-formed retainers (VFRs) with the standard protocol of wearing Hawley retainer in maintaining the results of orthodontic treatment. Material and Methods: This single-blind randomized clinical trial consisted of 90 patients who finished orthodontic treatment at the Department of Orthodontics of Mashhad Dental School, and required removable retainers. The participants were randomly divided into 3 groups and received the following treatments. Group 1: Hawley retainers (4 months full-time and then night-only); group 2: VFR4M (4 months full-time and then night-only); group 3: VFR1W (1 week full-time and then night-only). The study models were prepared after debond and at 4 and 8 months later, and intercanine width, intermolar width, arch length and the Little's irregularity index were compared between groups. Results: No significant differences were found in intercanine and intermolar widths between groups (P > 05). Upper arch length was significantly lower in Hawley group than the two VFR groups (p < 0.05), but lower arch length values were comparable. Upper irregularity index was significantly lower in two VFR groups compared to Hawley group (p < 0.05), whereas in the lower jaw, only VFR4M group showed significantly lower crowding than Hawley group (p < 0.05). Conclusion: Both retention regimens of VFRs were more effective than Hawley retainer in maintaining arch length and tooth alignment in the upper arch. For better incisor alignment in the lower jaw, the patients should be advocated to wear VFR 4 months full-time and then at night instead of wearing Hawley retainer. © Medicina Oral S. L.

Item Type: Article
Additional Information: Cited By :3 Export Date: 16 February 2020 Correspondence Address: Ahrari, F.; Dental Research Center, School of Dentistry, Mashhad University of Medical SciencesIran; email: Farzaneh.Ahrari@gmail.com
Uncontrolled Keywords: Essix Hawley retainer Orthodontic treatment Retention Vacuum-formed retainer
Subjects: WU Dentistry. Oral surgery
Divisions: Mashhad University of Medical Sciences
Depositing User: lib2 lib2 lib2
Date Deposited: 06 May 2020 13:38
Last Modified: 06 May 2020 13:38
URI: http://eprints.mums.ac.ir/id/eprint/17481

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