How deep should an impression tray be to allow proper material thickness?

An impression tray should be designed to accommodate a material thickness of 2-3 mm to ensure optimal results during the impression-taking process. This thickness allows sufficient material to flow effectively around the anatomical structures while also providing enough stability and support to capture accurate details without risking distortion. A thickness that is too thin could lead to an inadequate representation of the oral anatomy, while too much thickness could prevent the material from conforming properly to the dental structures, potentially compromising the quality of the impression. Thus, a depth of 2-3 mm strikes the right balance for achieving precise impressions needed for dental procedures.