![shutterstock_69850990- vacuum splint](https://www.nationalelfservice.net/cms/wp-content/uploads/2011/08/shutterstock_69850990-vacuum-splint-150x150.jpg)
This review comparing the effects of vacuum-formed retainers (VFR) and Hawley retainers (HR) on periodontal health included 6 RCTs. While the findings suggests a statistical benefit in favour of HR in the short term the studies are small, short-term and most ( 5) were considered to be at high risk of bias.
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