Transparent, hard, and elastic sheets that combine with the DURASPLINT® and DURASPLINT® LC self-curing resins. A pre-treatment with LC-Primer is required for the use of DURASPLINT® LC. The Miniplast splints, radiographic templates, devices for the treatment of obstructive sleep apnea, and provisional restorations, as well as fluoridation trays and pre-drying, are not necessary. Application for sleep, reinforcement for anterior teeth for sports mouthguards.