Effect of each light curing units on the microhardness and microleakage of composite resin

Eu-Jin Jung; Hee-Joo Lee; Bock Hur

doi:10.5395/JKACD.2004.29.1.058

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Jung, Lee, and Hur: Effect of each light curing units on the microhardness and microleakage of composite resin

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2004; 29(1): 58-65.

Published online: 31 January 2004

DOI: https://doi.org/10.5395/JKACD.2004.29.1.058

Effect of each light curing units on the microhardness and microleakage of composite resin

Eu-Jin Jung, Hee-Joo Lee, Bock Hur

Department of Conservative dentistry, College of Dentistry, Pusan National University, Korea.

Corresponding author: Eu-Jin Jung. Department of Conservative Dentistry, Collage of Dentisry, Pusan National University, 1-10, Ami-dong, Seo-gu, Pusan, 602-739, Korea. Tel: 051)240-7454, carrot31@freechal.com

(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 objectives of this study was to evaluate current visible light curing units regarding microhardness and microleakage. Fourty samples of composite resin(Z-250, 3M) were cured by different light curing units(Flipo, LOKKI; Credi II, 3M; XL 3000, 3M; Optilux 500,Demetron) in acrylic blocks. Microhardness was measured using a calibrated Vickers indenter on both top and bottom surfaces after 24 hours of storage in air at room temperature. Class V cavities were prepared on buccal and lingual surfaces of fourty extracted human molars. Each margin was on enamel and dentin/cementum. Composite resin(Z-250, 3M) was filled in cavities and cured by four different light curing units(Flipo, LOKKI; Credi II, 3M; XL 3000, 3M; Optilux 500, Demetron).

The results of this syudy were as follows:

Microhardness

1. Flipo showed low microhardness compared to Optilux 500, Credi II significantly in upper surface. Flipo didn't show a significant difference compared to XL 3000.

2. The microhardness resulting from curing with Flipo was lower than that of others on lower surfaces.

Microleakage

1. Dentin margin showed significantly high dye penetration rate than enamel margin in all groups(p<0.05).

2. No significant differences were found on both enamel and dentin margin regarding curing units.

Keywords: Plasma arc, Microleakage, Microhardness

Figures and Tables

Fig. 1

Diagram of acrylic plastic mold showing light tip in position over resin sample.

Fig. 2

Microhardness of upper and lower surface

Fig. 3

The ratings of the dye penetration at enamel and dentin margin

Table 1

Light curing mode

Table 2

The ratings of the dye penetration

Table 3

Microhardness of upper and lower surface

Table 4

Microhardness of upper and lower surface cured by each light curing unit

Table 5

Statistical difference of upper and lower surface

^*Different Tukey letters denote statistically different groups

Table 6

The ratings of the dye penetration at enamel and dentin margin

^*Same Tukey letters denote statistically same groups

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