ABSTRACT
There were analysed four acrylic resins which are ussualy used in dental practice, respectively: MELIODENT, SUPERACRYL, TRIPLEX and VERTEX. In accordance with dental practice, there were made by polymerization samples with the following dimensions: 2 mm thickness, 30 mm length and 5 mm width. In order to define the mechanism of fracture, all amples were loaded in the same manner. Mechanical characteristics were determined by Zwick Roel equipment with data processing using testXpert system. The loaded stress was 50 kN and the rezolution 0,1 μm for all experiemental samples. The experimental samples were then analysed at stereomicroscope Olympus type SZX7, equiped with image processing soft QuickphotoMicro 2.2. There were analysed both longitudinal and transversal surfaces perpendicular to fracture surface.
