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.

Temperature rise on dentin caused by temporary crown and fixed partial denture materials: Influencing factors

“…3,6,[9][10][11] As the t-c&b is in direct contact with cut dentin, a considerable amount of heat may be transferred to the pulp chamber. 12,13 This in turn may lead to thermal pulp damages, if a critical threshold is surpassed. 11 Literature reveals this value to be a temperature increase of 5.6 8C.…”

“…fabrication technique, type of matrix used), 3,10,[16][17][18] as well as to the remaining thickness of the cut dentin wall. 12,15,19 In vitro test-setups have been developed for determination of the temperature occurring inside the pulp chamber to asses the potential of pulp damage. 10,12,17,18,[20][21][22][23][24][25][26] The temperatures determined range between 40 8C and 80 8C.…”

“…12,15,19 In vitro test-setups have been developed for determination of the temperature occurring inside the pulp chamber to asses the potential of pulp damage. 10,12,17,18,[20][21][22][23][24][25][26] The temperatures determined range between 40 8C and 80 8C. 8,11 With composite-based t-c&bs, the potential of pulp injury is regarded lower compared to products based on monomethacrylates.…”

Intrapulpal thermal changes during direct provisionalization using various autopolymerizing resins: Ex-vivo study

“…Tooth sample preparation was done on extracted natural teeth numbers 35, 36 and 37 of an average size and form. 19 The mandibular second molar (37) was prepared to receive conventional three quarter crown mandibular second premolar (35) was prepared to receive conventional three quarter crown mandibular first molar (36) was prepared to receive conventional complete veneer metal crown. The roots of these extracted prepared teeth were sectioned 3 mm below cemento-enamel junction …”

“…19,20 Keeping this in view the present study was envisaged. An ex-vivo study was conducted to compare the temperature rise in the pulp chamber during direct provisionalization using various autopolymerizing resins and also to evaluate the effect of residual dentinal thickness of differently prepared teeth on the above mentioned temperature rise.…”