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HOME > Restor Dent Endod > Volume 29(1); 2004 > Article
Original Article Effect of each light curing units on the microhardness and microleakage of composite resin
Eu-Jin Jung, Hee-Joo Lee, Bock Hur
2004;29(1):-65.
DOI: https://doi.org/10.5395/JKACD.2004.29.1.058
Published online: January 31, 2004

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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

Copyright © 2004 Korean Academy of Conservative Dentistry

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  • 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.
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Fig. 1
Diagram of acrylic plastic mold showing light tip in position over resin sample.
jkacd-29-58-g001.jpg
Fig. 2
Microhardness of upper and lower surface
jkacd-29-58-g002.jpg
Fig. 3
The ratings of the dye penetration at enamel and dentin margin
jkacd-29-58-g003.jpg
Table 1
Light curing mode
jkacd-29-58-i001.jpg
Table 2
The ratings of the dye penetration
jkacd-29-58-i002.jpg
Table 3
Microhardness of upper and lower surface
jkacd-29-58-i003.jpg
Table 4
Microhardness of upper and lower surface cured by each light curing unit
jkacd-29-58-i004.jpg
Table 5
Statistical difference of upper and lower surface

*Different Tukey letters denote statistically different groups

jkacd-29-58-i005.jpg
Table 6
The ratings of the dye penetration at enamel and dentin margin

*Same Tukey letters denote statistically same groups

jkacd-29-58-i006.jpg

Tables & Figures

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    • Comparison of Surface Microhardness of the Flowable Bulk-Fill Resin and the Packable Bulk-Fill Resin according to Light Curing Time and Distance
      Hyung-Min Kim, Moon-Jin Jeong, Hee-Jung Lim, Do-Seon Lim
      Journal of Dental Hygiene Science.2023; 23(2): 123.     CrossRef

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      Effect of each light curing units on the microhardness and microleakage of composite resin
      J Korean Acad Conserv Dent. 2004;29(1):58-65.   Published online January 31, 2004
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    Related articles
    Effect of each light curing units on the microhardness and microleakage of composite resin
    Image Image Image
    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
    Effect of each light curing units on the microhardness and microleakage of composite resin

    Light curing mode

    The ratings of the dye penetration

    Microhardness of upper and lower surface

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

    Statistical difference of upper and lower surface

    *Different Tukey letters denote statistically different groups

    The ratings of the dye penetration at enamel and dentin margin

    *Same Tukey letters denote statistically same groups

    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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