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

Hoon-Sang Chang; Young-Jun Lim; Jeong-Mi Kim; Sung-Ok Hong

doi:10.5395/JKACD.2010.35.5.353

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Chang, Lim, Kim, and Hong: Power density of light curing units through resin inlays fabricated with direct and indirect composites

Basic Research

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2010; 35(5): 353-358.

Published online: 30 September 2010

DOI: https://doi.org/10.5395/JKACD.2010.35.5.353

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

Hoon-Sang Chang, DDS, PhD¹, Young-Jun Lim, DDS¹, Jeong-Mi Kim, MS², Sung-Ok Hong, DDS, MS¹

Assistant Professor

Graduate Student

Dental Technologist

Assistant Professor

¹Department of Conservative Dentistry, Wonkwang University College of Dentistry and Dental Research Institute, Iksan, Korea.

²Dental Laboratory, Wonkwang University Dental Hospital, Iksan, Korea.

Correspondence to Hoon-Sang Chang, DDS, PhD. Assistant Professor, Department of Conservative Dentistry, Wonkwang University College of Dentistry and Dental Research Institute, 344-2 Shinyong-dong, Iksan, Korea 570-210. Tel, +82-63-859-2931; Fax, +82-63-859-2932; husch03@wonkwang.ac.kr

Received 22 July 2010 Revised 9 August 2010 Accepted 10 August 2010

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.

Keywords: Halogen light curing unit, Hand held dental radiometer, LED light curing unit, Power density, Resin inlay, Sinfony

Figures and Tables

Table 1

Composition of the resin composites used in this study

The composition of the organic matrix, filler, and filler contents was provided by the manufacturers.

Bis-GMA, Bisphenol A diglycidyl ether dimethacrylate; UDMA, urethane dimethacrylate; Bis-EMA, Bisphenol A polyethylene glycol diether dimethacrylate; TEGDMA, triethylene glycol dimethacrylate.

Table 2

Power density (mW/cm² ± SD) of light curing units through resin specimens of 1.5 mm thickness

^*The superscripts with the same letters are not significantly different at α= 0.05.

Table 3

Power density (mW/cm² ± SD) of light curing units through resin specimens of 0.5 mm thickness

^*The superscripts with the same letters are not significantly different at α= 0.05.

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