Abstract
Triad is a visible light-cured material that can be adapted for various dental uses and provides rapid service at low cost. The material is manufactured in the form of sheets and ropes, and originally the system included artificial teeth manufactured in preformed mandibular and maxillary arches. The material is now recommended for complete and partial dentures, orthodontic appliances, custom impression trays, record bases, relines, repairs, temporary bridges and splints. In this investigation the following properties of the material were evaluated: dimensional accuracy, Young's modulus, transverse strength and deflection, impact resistance, fracture toughness, water uptake, and hardness. This investigation compared Triad with 3 conventional acrylic resin denture base materials. Triad was found to be harder and more rigid than the other materials, and its impact resistance was low. It exhibited a different water absorption pattern from the other materials, and dimensional accuracy was variable, probably due to variation in delivery of light from the light source. There appeared to be a variable fit of Triad upper denture base in the palatal region, which indicated the need for a careful laboratory processing technique.