title: Temperature rise during polymerization of three different provisional materials.
abstract: The purpose of this study was to evaluate the temperature rise during polymerization of three different provisional materials by direct method on two different dentin disc thicknesses. Two autopolymerizing; bis-acrylic composite (Fill-in; Kerr), polymethyl methacrylate (Temdent; Weil Dental), and one light polymerizing composite (Revotek LC; GC) provisional restoration materials were used in this study. Sixty dentin discs were prepared from extracted molars (diameter, 5 mm; height, 1 or 2 mm). These dentin discs (1 or 2 mm) were placed on apparatus developed to measure temperature rise. The temperature rise during polymerization was measured under the dentin disc with a J-type thermocouple wire that was connected to a data logger. Statistical analysis was performed with two-way analysis of variance followed by Tukey HSD test (alpha=0.05). Temperature rise values statistically varied according to the provisional restoration material used (light polymerized, auto polymerized; P<0.001) and the dentin thickness (1 and 2 mm; P<0.001). The polymethyl methacrylate based provisional material induced significantly higher temperature rise than other provisional restoration materials at 2-mm dentin thickness (P<0.01). At 1-mm dentin thickness, polymethyl methacrylate and composite induced significantly higher temperature increase than bis-acrylic composite provisional material (P<0.05). The risk for heat-induced pulpal damage should be taken into consideration during polymerization of provisional materials in deep cavities in which dentin thickness is less than 1 mm.
authors: Department of Prosthodontics, Karadeniz Technical University, School of Dentistry, Trabzon, Turkey.
authors: Subutay Han
authors: SH
authors: Altintas
authors: Isa
authors: I
authors: Yondem
authors: Onjen
authors: O
authors: Tak
authors: Aslihan
authors: A
authors: Usumez
mesh_terms: D000180:Acrylic Resins; D003188:Composite Resins; D003804:Dentin / Q000033:anatomy & histology; D003833:Denture, Partial, Temporary; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D044367:Phase Transition; D055116:Self-Curing of Dental Resins; D013696:Temperature
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins