J Korean Acad Conserv Dent.  2003 Mar;28(2):156-161. 10.5395/JKACD.2003.28.2.156.

Polymerization ability of several light curing sources on composite resin

• Shin HJ
• Kim JW
• Cho KM

• KMID: 1987243
• DOI: http://doi.org/10.5395/JKACD.2003.28.2.156

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. 1. The composite cured with LED showed equal to higher microhardnesss than halogen. 2. 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.

Keyword

Light Transmittability; Halogen; LED; Plasma; Microhardness; Curing time

MeSH Terms

Fungi
Hardness
Plasma
Polymerization*
Polymers*
Stainless Steel
Polymers
Stainless Steel

Figure

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  Fig. 1 Schematic drawing of constructed device used to prepare resin sample

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  Fig. 2 Microhardness of each light source at each thickness

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