custom tray
An individually fabricated impression tray made to a patient's specific arch form, used to take a precise final impression for prosthetic construction.
Full Definition
A custom tray (also: special tray, individual tray) is a tray manufactured in the dental laboratory from acrylic resin over a preliminary cast, designed to provide a uniform, controlled thickness of impression material around the patient's unique dental arch. Unlike stock trays, custom trays minimise material distortion and improve dimensional accuracy, making them essential for crown-and-bridge and complete denture impressions. They may be perforated or space-relieved depending on the impression material to be used. Editors should note the hyphenation ('custom tray' is two words, unhyphenated; 'custom-made tray' is hyphenated before a noun) and be aware of the British English equivalent 'special tray.'
Usage
Usage note: 'Custom tray' is two unhyphenated words as a noun. British English equivalent is 'special tray.' Do not confuse with 'stock tray,' which is a prefabricated, non-patient-specific alternative.
In Context
- "A custom tray was requested in the laboratory prescription to ensure a controlled, even wash impression thickness." — Crown and bridge laboratory prescription
- "The technician fabricated the custom tray in light-cured acrylic resin with 2 mm spacer wax over the study cast." — Dental laboratory work order