EFFECT OF LIGHT SOURCE AND SHADE ON DEPTH OF CURE OF COMPOSITES

Article information

Restor Dent Endod. 2002;27(6):561-568

Publication date (electronic) : 2002 January 14

doi : https://doi.org/10.5395/JKACD.2002.27.6.561

Joon-Sok Na , Sun-Wa Jeong , Yun-Chan Hwang , Sun-Ho Kim , Chang Yun , Won-Mann Oh , In-Nam Hwang

Dept. of Conservative Dentistry, College of Dentistry, DSRI, Chonnam National University

Dept. of Dentistry, College of Medicine, Seonam University

Abstract

ABSTRACT

Purpose of this research is estimating polymerization depth of different source of light. XL 3000 for halogen light, Apollo 95E for plasma arc light and Easy cure for LED light source were used in this study. Different shade (B1 & A3) resin composites (Esthet-X, Dentsply, U.S.A.) were used to measure depth of cure. 1, 2, and 3 mm thick samples were light cured for three seconds, six seconds or 10 seconds with Apollo 95E and they were light cured with XL-3000 and Easy cure for 10 seconds, 20 seconds, or 40 seconds. Vicker's hardness test carried out after store samples for 24 hours in distilled water.

Results were as following.

Curing time increases from all source of lights, curing depth increased(p<0.05).
Depth (that except 1mm group and 2mm group which lighten to halogen source of light) deepens in all groups, Vickers hardness decreased(p<0.05).
Vicker's hardness of A3 shade composite was lower in all depths more than B1 shade composites in group that do polymerization for 10 seconds and 20 seconds using halogen source of light(p<0.05), but group that do polymerization for 40 seconds did not show difference(p>0.05).
Groups that do polymerization using Plasma arc and LED source of light did not show Vicker's hardness difference according to color at surface and 1mm depth(p>0.05), but showed difference according to color at 2mm and 3mm depth(p<0.05). The results showed that Apollo 95E need more polymerization times than manufacturer's recommendation (3 seconds), and Easy cure need polymerization time of XL-3000 at least.

Keywords: Curing depth; Plasma Arc; LED light

Fig. 1.

Schematic drawing of specimen fabrication.

Fig. 2.

Vicker's hardness number of composite cured by XL 3000

Fig. 3.

Vicker's hardness number of composite cured by Apollo 95E.

Fig. 4.

Vicker's hardness number of composite cured by Easy cure.

Fig. 5.

Mean VHN of B1 shade groups on top surface.

Fig. 6.

Mean VHN of B1 shade experimental groups on 1mm from the top surface.

Fig. 7.

Mean VHN of B1 shdae experimental groups on 2mm from the top surface.

Fig. 8.

Mean VHN of B1 shade experimental groups on 3mm from the top surface.

Fig. 9.

Ratio of the VHN by depth in B1 shade.

Fig. 10.

Ratio of the VHN by depth in A3 shade.

Table 1.

Composition of Esthet∙X

Table 2.

Tested light curing unit

Table 3.

Light source, resin shade and irradiation time for tested group

Table 4.

Vicker's hardness number of B1 shade Mean(S.D.), n=15

Table 5.

Vicker's hardness number of A3 shade Mean(S.D.), n=15

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