Essix Retainer
A vacuum-formed, transparent plastic retainer fabricated over a dental model to maintain tooth positions following orthodontic treatment.
Full Definition
The Essix retainer is a type of removable vacuum-formed retainer (VFR) made from clear thermoplastic material, covering all teeth in the arch. It is widely used as an alternative to the wire-and-acrylic Hawley retainer due to its superior aesthetics and ease of fabrication. Unlike the Hawley retainer, the Essix design covers the occlusal (biting) surfaces of the teeth, which may affect the bite if worn continuously. Editors must note that 'Essix' is a proprietary eponym and is capitalised; 'vacuum-formed retainer' or 'VFR' are acceptable generic alternatives.
Usage
Usage note: Capitalise 'Essix' as it is a brand-derived eponym. In formal writing, prefer 'vacuum-formed retainer (VFR)' on first mention with 'Essix retainer' as an acceptable informal variant thereafter.
In Context
- "Upper and lower Essix retainers were issued at the debond appointment." — Treatment completion letter
- "The patient was advised to wear the vacuum-formed retainer full-time for the first six months." — Retention protocol document