This in vitro study compared and determined the temperature increase in the pulp chamber of permanent maxillary first premolar teeth placed in contact with different resins used for the fabrication of provisional resto- rations.

Polymethyl methacrylate (DPI), poly- ethyl methacrylate (SNAP), polyvinylethyl methacrylate (TRIM), bis-acrylic composite (Protemp II) were compared with respect to their exothermic properties during polymerization. Eighty freshly extracted maxillary first premolars were prepared for complete coverage restoration were placed in an acrylic resin block. A thermal probe connected to a digital thermometer was placed into the pulp chamber. Specimens were submerged in a water bath to simulate intraoral conditions. The provisional materials were manipulated according to manufacturer's instructions. The resin mix was placed into template and was then positioned on the prepared tooth. The temperature was recorded during the polymerization at 30-second intervals until it was evident that the peak temperature had been reached.

  After complete polymerization, the template was removed from the tooth and the provisional crown was retrieved. Data was analyzed with one-way ANOVA and Bonferroni multiple comparisons test.

Mean temperature increase for the provisional crown fabrication ranged from 38.78°C, 37.79°C, 37.71°C and 35.88°C for polymethyl methacrylate, polyethyl methacrylate, polyvinyl- ethyl methacrylate and bis-acrylic composite respectively.

  Polymethyl methacrylate, polyethyl methacrylate and bisacrylic composite were highly significant.

All the materials used were in the safer limit. Hence, by comparing all the four material, Bis-acrylic composite showed least temperature rise in pulp chamber.

Raju M. Comparison of Exothermic Release during the Polymerization of Four Materials used to fabricate Provisional Restorations. Int J Prosthodont Restor Dent 2014;4(1):1-5.