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KMID : 0361920120420050255
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Korean Journal of Orthodontics
2012 Volume.42 No. 5 p.255 ~ p.262
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Comparison of retention characteristics of Essix and Hawley retainers
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Demir Abdullah
Babacan Hasan
Nalcacı Ruhi
Topcuoglu Tolga
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Abstract
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Objective: We aimed to compare the retention characteristics of Essix and Hawley retainers.
Methods: Adolescents undergoing fixed appliance treatment at 2 centers were recruited for this study. Twenty-two patients (16 women and 6 men) wore Essix retainers (Essix group) while 20 (14 women and 6 men) wore Hawley retainers (Hawley group). The mean retention time was 1 year, and the mean follow-up recall time for both groups was 2 years. Two qualified dental examiners evaluated the blind patient data. Maxillary and mandibular dental casts and lateral cephalograms were analyzed at 4 stages: pretreatment (T1), post-treatment (T2), post-retention (T3), and follow-up (T4).
Results: The results revealed that Essix appliances were more efficient in retaining the anterior teeth in the mandible during a 1-year retention period. The irregularity index increased in both arches in both groups after a 2-year post-retention period. The mandibular arch lengths increased during treatment and tended to return to their original value after retention in both groups; however, these changes were statistically significant only in the Hawley group. Cephalometric variables did not show any significant differences.
Conclusions: The retention characteristics of both Essix and Hawley retainers are similar.
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KEYWORD
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Retention, Relapse, Orthodontic treatment
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