18 pairs of complete dentures were manufactured at Faculty of Dentistry Timisoara, from different heat-curing dental resisns: Superacryl, Triplex, Vertex. 6 pairs were tested directly on the mechanical testing machine LBG 100T, other 6 had as support the plaster model and other 6 were adapted on models with help of silicone (Lastic Xtra, Kettenbach, Germany). The dentures were tested at compression, until they broke, by applying forces on their occlusal surfaces. The results emphasized a rapid braking of the dentures that didn't have any support. The slowest fracture took place in case of the dentures adapted on model with help of silicone. The braking happened at 2,1 kN, The more intimate adaptation to prosthetic field the prostheses have, the more resistant they are. Denture's mechanical behavior is connected to resin's properties. Keywords: complete dentures, compression test, dental resins