Curing performance of a new-generation light-emitting diode dental curing unit

Area of Science:

• Dental Materials Science
• Biomedical Engineering
• Photochemistry

Background:

• Recent advancements introduced high-powered (HP), battery-operated LED dental curing lights.
• These devices offer potential improvements in efficiency and usability for dental professionals.

Purpose of the Study:

• To evaluate the curing efficiency and peak polymerization temperature (Tp) of a novel HP LED curing light.
• To compare its performance against existing LED and halogen curing units.

Main Methods:

• Four visible light-curing (VLC) units were tested: HP LED (A), first-generation LED (B), conventional halogen (C), and high-intensity halogen (D).
• Depth of cure (DOC), adhesion, and Tp were measured for three resin composites after exposure to each unit.
• Exposure times for units A and D were halved compared to units B and C.

Main Results:

• Unit A exhibited a power density of 1,000 mW/cm², comparable to a high-intensity halogen unit (D) on turbo charge.
• Unit A achieved equivalent DOC and adhesion in 10 seconds compared to unit D (10s) and units B/C (20s).
• Resin composites cured with Unit A showed significantly lower Tps than those cured with unit D (equivalent time) and unit C (double time).

Conclusions:

• The HP LED curing light (Unit A) effectively cured resin composites in half the time of conventional LED and halogen units.
• It matched the curing time of high-intensity halogen units while maintaining lower peak polymerization temperatures.
• This battery-operated HP LED curing light presents a time-saving and effective alternative for clinical light curing of resin composites.