J Korean Acad Conserv Dent.  2010 Sep;35(5):353-358. 10.5395/JKACD.2010.35.5.353.

Power density of light curing units through resin inlays fabricated with direct and indirect composites

• Chang HS
• Lim YJ
• Kim JM
• Hong SO

• KMID: 2176433
• DOI: http://doi.org/10.5395/JKACD.2010.35.5.353

Abstract

OBJECTIVES
The purpose of this study was to measure the power density of light curing units transmitted through resin inlays fabricated with direct composite (Filtek Z350, Filtek Supreme XT) and indirect composite (Sinfony).
MATERIALS AND METHODS
A3 shade of Z350, A3B and A3E shades of Supreme XT, and A3, E3, and T1 shades of Sinfony were used to fabricate the resin inlays in 1.5 mm thickness. The power density of a halogen light curing unit (Optilux 360) and an LED light curing unit (Elipar S10) through the fabricated resin inlays was measured with a hand held dental radiometer (Cure Rite). To investigate the effect of each composite layer consisting the resin inlays on light transmission, resin specimens of each shade were fabricated in 0.5 mm thickness and power density was measured through the resin specimens.
RESULTS
The power density through the resin inlays was lowest with the Z350 A3, followed by Supreme XT A3B and A3E. The power density was highest with Sinfony A3, E3, and T1 (p < 0.05). The power density through 0.5 mm thick resin specimens was lowest with dentin shades, Sinfony A3, Z350 A3, Supreme XT A3B, followed by enamel shades, Supreme XT A3E and Sinfony E3. The power density was highest with translucent shade, Sinfony T1 (p < 0.05).
CONCLUSIONS
Using indirect lab composites with dentin, enamel, and translucent shades rather than direct composites with one or two shades could be advantageous in transmitting curing lights through resin inlays.

Keyword

Halogen light curing unit; Hand held dental radiometer; LED light curing unit; Power density; Resin inlay; Sinfony

MeSH Terms

Composite Resins
Dental Enamel
Dentin
Hand
Inlays
Light
Pyridines
Thiazoles
Composite Resins
Pyridines
Thiazoles