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J Am Dent Assoc, Vol 135, No 10, 1471-1479. © 2004 American Dental Association

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Background. Recent technological advances have resulted in the marketing of high-powered, or HP, battery-operated light-emitting diode, or LED, dental curing lights. The authors examine the curing efficiency and peak polymerization temperature, or T_p, of a new HP LED curing light.

Methods. The authors studied four visible light-curing, or VLC, units: HP LED (A), first-generation LED (B), conventional halogen (C) and high-intensity halogen (D). They determined the depth of cure, or DOC; adhesion; and T_p of three types of VLC resin-based composites after exposure to each light. The exposure times for units A and D were one-half those for units B and C.

Results. The power density of unit A was 1,000 milliwatts per square centimeter, which was comparable to that of unit D with turbo charge. The DOC and adhesion attained for all three resin-based composites after being light cured by unit A for a 10-second exposure time were equivalent to those after being light cured by unit D for a 10-second exposure time and to those after being light cured by units B and C for 20-second exposure times. The resin-based composites light cured by unit A attained significantly lower T_ps than did those light cured by unit D at equivalent cure, or exposure, times and by unit C at twice the cure time.

Conclusions. The authors found that Unit A effectively cured the resin-based composites at one-half the cure time of units B and C and at the same time as unit D, while maintaining low T_p.

Clinical Implications. The battery-operated HP LED curing light might be an effective, time-saving alternative for clinicians to use in light curing resin-based composites.

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