Tray (Impression)

A tray (impression) is a rigid or flexible device used by dental professionals to hold soft impression material against the teeth and surrounding tissues so an accurate negative replica of the mouth can be produced. Trays may be stock (preformed in various sizes) or custom-made to fit an individual patient, and they are used with materials such as alginate, silicone or polyether depending on the level of detail required.

During the procedure the tray is filled with impression material and seated over the teeth until the material sets, then removed to provide a mould that dental technicians use to make crowns, bridges, dentures, mouthguards or study models. Proper tray selection and technique help ensure accurate records and a good fit for restorations and appliances, and while the process is generally short it can feel messy or trigger a gag reflex for some people.