OTILIA CORNELIA BOLOS, CRISTINA MARIA BORTUN, ANGHEL CERNESCU, LAVINIA FRACTURE TOUGHNESS EVALUATION OF SOME RESINS USED IN COMPLETE DENTURES TECHNOLOGY Polymer materials for denture bases, with thermal or light polymerization are relatively fragile, being considered brittle materials from the Fracture Mechanics concepts point of view. This paper presents a comparative study on determination of fracture toughness for 2 types of resins used in complete dentures technology: heat-curing resin (Meliodent), and light-curing resin (Eclipse). The tests were performed on a static loading machine, model Zwick/Roell of 5kN. The results obtained by 2 methods differ no more than 10-15%. Both methods showed that Eclipse has a better resistance to fracture than Meliodent.