Comparison of Silorane and Methacrylate-Based Composites on the Polymerization Heat Generated with Different Light-Curing Units and Dentin Thicknesses

Abstract

This study evaluated the temperature variation in the pulp chamber during photoactivation of two restorative composite resins (Filtek P90 silorane-based composite and Heliomolar methacrylate-based composite) with either a quartz-tungsten-halogen (QTH) or light-emitting diodes (LED) light-curing unit (LCU) and using dentin thicknesses (0.5 and 1.0 mm). Standardized cavities (2x2x2 mm) were prepared in 80 bovine incisors, which were randomly assigned to 8 groups according to the photoactivation method and dentin thickness. Filtek P90 and Heliomolar (both in shade A3) were used with their respective adhesive systems (P90 self-etch primer / P90 adhesive bond and Excite adhesive). All experiments were carried out in a controlled environment (37°C). The temperature variations (°C) were recorded using a digital thermometer attached to a K-type thermocouple. The results were analyzed statistically by ANOVA and Tukey's test (α=0.05). For composite/dentin thickness interaction, temperature increase was significantly higher in 0.5 mm dentin thickness (40.07°C) compared with 1.0 mm dentin thickness (39.61°C) for Filtek P90. For composite/LCU interaction, the temperature increase was significantly higher for Filtek P90 (39.21°C - QTH and 40.47°C - LED) compared with Heliomolar (38.40°C - QTH and 39.30°C - LED). The silorane-based composite promoted higher temperature increase in the pulp chamber than the methacrylate-based composite.

Effect of Light Curing Modes of High-Powered LEDs on Temperature Rise under Primary Teeth Dentin (An In Vitro Study)

“…The second part of the current study investigated the effect of dentin thickness on the recorded temperature rise. Studies have suggested that dentin thickness is a critical factor that influences the amount of temperature rise in the pulp chamber because of the low thermal conductibility of this normal structure [42,43]. The present study confirmed this because differences were observed in the temperature rise between dentin thicknesses.…”

What is the impact of Light Curing Modes of High-Powered LED on Temperature rise in Primary Teeth Dentin: an in-vitro study

“…The second part of the study investigated the effect of increasing dentin thickness on the recorded temperature rise. According to Guiraldo et al [39], dentin thickness is a critical factor that in uences the amount of heat reaching the pulp, due to the low thermal conductibility of dentin [35]. The present study con rmed this because differences were observed in the temperature rise among dentin thicknesses.…”

Effect of light curing modes of high-powered LEDs on temperature rise under primary teeth dentin (an in vitro study)

“…The second part of the current study investigated the effect of dentin thickness on the recorded temperature rise. Studies have suggested that dentin thickness is a critical factor that in uences the amount of temperature rise in the pulp chamber 42 because of the low thermal conductibility of this normal structure. 43 The present study con rmed this because differences were observed in the temperature rise between dentin thicknesses.…”