Influence of Bulk-fill, Flowable, and Dual-cure Resin Restorative Materials on Intrapulpal Thermal Changes during Polymerization with Light-curing Units at Curing Tip Distance
Vanga V Narsimha Rao, Chandrabhatla S Kumar
Cention N, Spectrum, Tetric N flow
Citation Information :
Narsimha Rao VV, Kumar CS. Influence of Bulk-fill, Flowable, and Dual-cure Resin Restorative Materials on Intrapulpal Thermal Changes during Polymerization with Light-curing Units at Curing Tip Distance. Int J Experiment Dent Sci 2020; 9 (2):56-61.
Aim and objective: The purpose of the study was to evaluate the temperature changes in the pulp chamber that occur during the polymerization of bulk-fill, flowable bulk-fill, and dual-cure resin restorative materials influenced by various light-curing devices at different curing tip distances. Materials and methods: In the present in vitro study, dentin discs of 1 mm thick and Teflon molds with a cylindrical cavity of 2 mm diameter with lengths of 3, 4, and 5 mm were used to simulate tooth structure with a prepared occlusal cavity. Teflon molds were restored with 2 mm Spectrum (universal microhybrid composite Dentsply), Tetric N flow (Bulk Fill Ivoclar-Vivadent), and Cention N (self-curing resin based with light-curing option Ivoclar-Vivadent), respectively, the remaining difference in the length of the Teflon mold depicts the curing tip distance for the light-curing units. Process of photopolymerization was done with LEDition Ivoclar-Vivadent and 3M™ ESPE™ Elipar™ 2500 halogen curing unit at curing tip distances of 1, 2, and 3 mm, respectively. The thermal changes below the dentin discs were recorded on the K-type digital thermocouple (DT-302-1 HTC). These values obtained were tabulated and submitted to statistical analysis using analysis of variance (ANOVA) and Tukey's multiple post hoc procedures. Results: Significant differences were observed in the temperature rise among bulk-fill, flowable bulk-fill, and dual-cure resin (p < 0.05). Halogen curing unit exhibited significantly higher temperature rise than LEDition (p < 0.05). The smallest rise in temperature was observed in Spectrum composite with LEDition. Conclusion: The polymerization process and the amount of temperature rise are important in pulpal health. Even though there was a significant rise in temperature of the pulp, it had no significance in causing irreversible changes to the underlying tooth structures, which is attributed to improved properties of the materials.
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