Evidence-based retention: Where are we now?

Abstract

Relapse is unpredictable. Retention is used at the end of orthodontic treatment to resist tooth movements back toward the original malocclusion, but it is also required to resist unwanted tooth movements and disruptions in the occlusion that occur as a result of normal age changes. The approaches to retention vary significantly across the world. This article explores why we need retention and our current understanding of the best evidence-based approach to reducing relapse. There is a lack of high-quality evidence to support several aspects of retention, so the implications for clinical practice are discussed. Relapse is unpredictable. Retention is used at the end of orthodontic treatment to resist tooth movements back toward the original malocclusion, but it is also required to resist unwanted tooth movements and disruptions in the occlusion that occur as a result of normal age changes. The approaches to retention vary significantly across the world. This article explores why we need retention and our current understanding of the best evidence-based approach to reducing relapse. There is a lack of high-quality evidence to support several aspects of retention, so the implications for clinical practice are discussed. Millett DT, McDermott P, Field D, et al. Dental and periodontal health with bonded or vacuum-formed retainer. IADR Conference Abstract 3168. Toronto, 2008. McDermott P, Field D, Erfida I, et al. Operator and patient experiences with fixed or vacuum formed retainers. Irish Division IADR Conference Abstract 0017. Cork, 2007. McDermott P, Millett DT, Field D, et al. Lower incisor retention with fixed or vacuum formed retainers. IADR Conference Abtstract 0642. Toronto, 2008.