Polymerization ability of several light curing sources on composite resin

Hye-Jin Shin; Jin-Woo Kim; Kyung-Mo Cho

doi:10.5395/JKACD.2003.28.2.156

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Shin, Kim, and Cho: Polymerization ability of several light curing sources on composite resin

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2003; 28(2): 156-161.

Published online: 31 March 2003

DOI: https://doi.org/10.5395/JKACD.2003.28.2.156

Polymerization ability of several light curing sources on composite resin

Hye-Jin Shin, Jin-Woo Kim, Kyung-Mo Cho

Department of Conservative Dentistry, College of Dentistry Graduate School, Kangnung National University, Korea.

Corresponding author (drbozon@kangnung.ac.kr)

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The purpose of this study is to evaluate the polymerization ability of three different light sources by microhardness test. Stainless steel molds of 1, 2, 3, 4 and 5 mm in thickness of 7 mm in diameter were prepared. The hybrid composite Z100 was packed into the hole of the mold and curing light was activated for designated time. Three different light sources, conventional halogen, light emitting diode, and plasma arc, were used for curing of composite. Two different curing times applied; one is to follow the manufacturer's recommendation and the other is to extend the curing time of LED and plasma arc for balancing the light energy with halogen. Immediately after curing, the Vickers hardness was measured at the bottom of specimen.

The results were as follows.

The composite cured with LED showed equal to higher microhardnesss than halogen.
The composite was cured with plasma arc by manufacturer's recommendation showed lowest microhardness at all thickness. However, when curing time was extended, microhardness was higher than the others.

In conclusion, this study suggested that plasma arc needs properly extended curing time.

Keywords: Light Transmittability, Halogen, LED, Plasma, Microhardness, Curing time

Figures and Tables

Fig. 1

Schematic drawing of constructed device used to prepare resin sample

Fig. 2

Microhardness of each light source at each thickness

Table 1

Experimental groups designated with different light curing units and curing times

^*: Watts × seconds/cm² = Joules/cm²

Table 2

Means and standard deviation (SD) of microhardness

Table 3

Significance testing of mean microhardness of each light source within each depth

^*: not statistically significant (p > 0.05)

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