A dental device (appliance), fabricated from a resilient material such as flexible acrylic or vinyl, which covers the upper, lower, or both arches to protect them from trauma or disclusion. An athletic mouth guard is an example. Unlike its hard counterpart, this appliance is used only for shortterm indications because of its lack of durability.
A characteristic of a portion of an occlusal splint; generally, resilient acrylic placed on the intaglio surface for comfort or increased retention.