The basic appliance consists of clear acrylic (for esthetics) covering of the entire maxilliary or mandibular arch, heat cured for maximum strength. Careful finishing is required so each opposing tooth bears equally on the acrylic biting surface. For ease of insertion and removal as well as proper retention, the model must be carefully surveyed and the undercuts blocked out by the laboratory before appliance construction. The prescription should indicate whether a smooth bite plane or occlusal facets are required. A wax bite must be taken to the correct vertical opening desired for the entire appliance.