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Comparison of temperature rise in the pulp chamber with different light curing units: An in-vitro study
A V Rajesh Ebenezar1, R Anilkumar, R Indira
1Department of Conservative Dentistry & Endodontics, S.R.M. Dental College, Chennai, India.
Aims/Objectives:
This in vitro study was designed to measure and compare the temperature rise in the pulp chamber with different light curing units.
Materials And Methods:
The study was done in two settings-in-vitro and in-vivo simulation. In in-vitro setting, 3mm and 6mm acrylic spacers with 4mm tip diameter thermocouple was used and six groups were formed according to the light curing source- 3 Quartz-Tungsten-Halogen (QTH) units and 3 Light-Emitting-Diode (LED) units. For the LED units, three modes of curing like pulse-cure mode, fast mode and ramp mode were used. For in-vivo simulation, 12 caries free human third molar tooth with fused root were used. K-type thermocouple with 1 mm tip diameter was used. Occlusal cavity was prepared, etched, rinsed with water and blot dried; bonding agent was applied and incremental curing of composite was done. Thermal emission for each light curing agent was noted.
Results:
Temperature rise was very minimal in LED light cure units than in QTH light cure units in both the settings. Temperature rise was minimal at 6mm distance when compared to 3 mm distance. Among the various modes, fast mode produces the less temperature rise. Temperature rise in all the light curing units was well within the normal range of pulpal physiology.
Conclusion:
Temperature rise caused due to light curing units does not result in irreversible pulpal damage.