Related Experiment Video
Updated: Jul 8, 2026
09:06
Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
Published on: July 3, 2020
Pulp chamber temperature rise during curing of resin-based composites with different light-curing units
Summary
High-intensity light-emitting diode (LED) curing of resin-based composites (RBCs) can cause significant intrapulpal temperature rises, potentially leading to pulpal injury. Clinicians should carefully select light-curing units and exposure times, especially during bonding procedures.
Area of Science:
- Dental Materials Science
- Biomaterials
- Conservative Dentistry
Background:
- Resin-based composites (RBCs) are widely used in dental restorations.
- Light-curing units (LCUs) are essential for polymerizing RBCs.
- Intrapulpal temperature rise during curing is a concern for pulpal health.
Purpose of the Study:
- To measure intrapulpal temperature rise during polymerization of different shades of RBCs.
- To compare temperature rises generated by two light-emitting diode (LED) units and a halogen control.
Main Methods:
- Seventy extracted human molars were prepared using a split-tooth technique with embedded thermocouples.
- Cavities were restored with two shades of RBC (A2, C4) and cured using two LED LCUs and one halogen LCU.
- Intrapulpal temperature changes were recorded during polymerization and bonding phases.
Main Results:
- Intrapulpal temperature rises were significantly higher during bonding than during RBC curing for both LED lights.
- Temperature rises during bonding exceeded levels potentially causing irreversible pulpal damage.
- LED lights produced higher temperature rises compared to the halogen control, particularly during bonding.
Conclusions:
- There is a potential risk of heat-induced pulpal injury when light-curing RBCs, especially with high-energy LED systems.
- The risk is amplified during bonding procedures.
- Careful selection of LCUs and optimized exposure times are crucial to minimize pulpal thermal trauma.
Related Concept Videos
01:25Accelerated Curing of Concrete
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
01:26Curing Methods
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
01:20Curing of Concrete
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...