IN-VITRO MECHANICAL PROPERTY COMPARISON OF 4 RESINS USED FOR FABRICATION OF PROVISIONAL FIXED RESTORATIONS

Purpose. This study recorded and compared the flexural elastic moduli and moduli of rupture of four materials (Provipont DC resin, Triad pro visional restorative material, Tet acrylic resin, and a 50:50 mixture of Jet acrylic resin and orthodontic resin) used to make provisional r estorations. Material and methods. Thirty-nine identical 63 x 10 x 3 m m specimens were made from each of the four materials. After 24 hours, 30 days, and 60 days of water storage at 37 degrees C (13 specimens e ach), standard three-point bend tests were conducted on an Instron uni versal testing machine at a crosshead speed of 0.5 cm/minute. Stress s train curves were generated, and values for the flexural elastic modul i and moduli of rupture were calculated. Data were subjected to two-wa y and one-way analyses of variance (alpha = 0.05). Results. Provipont DC resin exhibited significantly higher flexural elastic moduli and mo duli of rupture values at the 24-hour test time. However, Provipont DC resin exhibited the greatest decrease in these values over time.