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HOME > Restor Dent Endod > Volume 36(4); 2011 > Article
Basic Research Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength
Ji-A Yoo, BS1, Byeong-Hoon Cho, DDS, Ph.D2orcid
2011;36(4):-335.
DOI: https://doi.org/10.5395/JKACD.2011.36.4.324
Published online: July 31, 2011

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Correspondence to Byeong-Hoon Cho, DDS, PhD. Professor, Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, 28-2 Yeongeon-dong, Jongro-gu, Seoul, Korea 110-749. TEL, +82-2-2072-3514; FAX, +82-2-764-3514; chobh@snu.ac.kr
• Received: January 29, 2011   • Revised: March 8, 2011   • Accepted: July 5, 2011

Copyright © 2011 Korean Academy of Conservative Dentistry

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  • Objectives
    This study investigated the effects of the color components of light-cured composite resin before and after polymerization on degree of conversion (DC) and biaxial flexural strength (FS).
  • Materials and Methods
    Four enamel shades (A1, A2, A3, A4) and two dentin shades (A2O, A3O) of Premisa (Kerr Co.) and Denfil (Vericom Co.) were evaluated on their CIE L*, a*, b* color components using the spectrophotometer before curing, after curing and at 7 day. The DC of same specimens were measured with Near-infrared spectrometer (Nexus, Thermo Nicolet Co.) at 2 hr after cure and at 7 day. Finally, the FS was obtained after all the other measurements were completed at 7 day. The correlations between each color component and DC and FS were evaluated.
  • Results
    The light-curing of composite resin resulted in color changes of Premisa in red-blue direction and Denfil in green-blue direction. The DC and FS were affected by product, time and shade (3-way ANOVA, p < 0.05) and product and shade (2-way ANOVA, p < 0.05), respectively. Premisa only showed a significant correlation between the DC and CIE a* component - before and after polymerization (Pearson product moment correlation, p < 0.05). The FS of Premisa showed significant negative correlations with CIE a* and CIE b* components.
  • Conclusions
    The DC and FS of the light-curing composite resin were affected by the color components of the material before and after polymerization.
  • Keywords: Biaxial flexural strength; CIE Lab*; Degree of conversion; Light-cured composite resin; Shade

This work was supported by the Korea Research Foundation (KRF) grant funded by the Korean government (MEST, No. 2009-0070771).

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Figure 1
Measurement assembly for measuring biaxial flexural strength. The assembly had a specimen support and a loading steel rod, which was used in a universal testing machine. For the support of the test specimen, three steel balls with a diameter of 3.0 mm, positioned 120° apart on a support circle with a diameter of 10 mm, was provided. The sample was placed concentrically on these supports and the load was applied with a flat punch with a diameter of 1.5 mm at the center of the specimen.
jkacd-36-324-g001.jpg
Figure 2
Changes in CIE L* values of each shade of (a) Premisa and (b) Denfil. Both products showed a relatively great decrease in the value (lightness) of each shade after curing. However, until 7 days, the values were a little increased.
jkacd-36-324-g002.jpg
Figure 3
Changes in CIE a* values of each shade of Premisa and Denfil. (a) The products of Denfil showed a relatively great decrease in the redness of each shade after curing. However, until 7 days, the values were a little increased. (b) The products of Premisa showed a gradual increase in the redness of each shade after curing.
jkacd-36-324-g003.jpg
Figure 4
Changes in CIE b* values of each shade of (a) Denfil and (b) Premisa. Both products showed a gradual decrease in the yellowness of each shade after curing.
jkacd-36-324-g004.jpg
Figure 5
Changes in degree of conversion (%) of each shade of (a) Denfil and (b) Premisa. Both products showed a gradual increase in the degree of conversion of each shade from 2 hours after curing to 7 days.
jkacd-36-324-g005.jpg
Table 1
Compositions of resin matrix and fillers of the resin composites used in this study

*Data described in this table were provided by the manufacturers.

Bis-GMA, Bisphenol A glycidyl methacrylate; TEGDMA, Triethylene glycol dimethacrylate; Bis-EMA, Ethoxylated bisphenol A dimethacrylate; PPF, Prepolymerized filler.

jkacd-36-324-i001.jpg
Table 2
Degree of conversion (DC) of two commercial dental composite resins measured at 2 hours and on 7 days after light-curing according to the shades (DC, mean ± SD; No., 10; unit, %)
jkacd-36-324-i002.jpg
Table 3
Biaxial flexural strength of two commercial dental composite resins measured on 7 days after light-curing according to the shades (FS, mean ± SD; No., 10; unit, MPa)
jkacd-36-324-i003.jpg
Table 4
Pearson product moment correlation between degree of conversion and biaxial flexural strength and shade components of each product measured before and after light-curing
jkacd-36-324-i004.jpg

Tables & Figures

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      Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength
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      DOI: https://doi.org/10.5395/JKACD.2011.36.4.324
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    Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength
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    Figure 1 Measurement assembly for measuring biaxial flexural strength. The assembly had a specimen support and a loading steel rod, which was used in a universal testing machine. For the support of the test specimen, three steel balls with a diameter of 3.0 mm, positioned 120° apart on a support circle with a diameter of 10 mm, was provided. The sample was placed concentrically on these supports and the load was applied with a flat punch with a diameter of 1.5 mm at the center of the specimen.
    Figure 2 Changes in CIE L* values of each shade of (a) Premisa and (b) Denfil. Both products showed a relatively great decrease in the value (lightness) of each shade after curing. However, until 7 days, the values were a little increased.
    Figure 3 Changes in CIE a* values of each shade of Premisa and Denfil. (a) The products of Denfil showed a relatively great decrease in the redness of each shade after curing. However, until 7 days, the values were a little increased. (b) The products of Premisa showed a gradual increase in the redness of each shade after curing.
    Figure 4 Changes in CIE b* values of each shade of (a) Denfil and (b) Premisa. Both products showed a gradual decrease in the yellowness of each shade after curing.
    Figure 5 Changes in degree of conversion (%) of each shade of (a) Denfil and (b) Premisa. Both products showed a gradual increase in the degree of conversion of each shade from 2 hours after curing to 7 days.

    Figure 1

    Figure 2

    Figure 3

    Figure 4

    Figure 5

    Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength

    Compositions of resin matrix and fillers of the resin composites used in this study

    *Data described in this table were provided by the manufacturers.

    Bis-GMA, Bisphenol A glycidyl methacrylate; TEGDMA, Triethylene glycol dimethacrylate; Bis-EMA, Ethoxylated bisphenol A dimethacrylate; PPF, Prepolymerized filler.

    Degree of conversion (DC) of two commercial dental composite resins measured at 2 hours and on 7 days after light-curing according to the shades (DC, mean ± SD; No., 10; unit, %)

    Biaxial flexural strength of two commercial dental composite resins measured on 7 days after light-curing according to the shades (FS, mean ± SD; No., 10; unit, MPa)

    Pearson product moment correlation between degree of conversion and biaxial flexural strength and shade components of each product measured before and after light-curing
    Table 1 Compositions of resin matrix and fillers of the resin composites used in this study

    *Data described in this table were provided by the manufacturers.

    Bis-GMA, Bisphenol A glycidyl methacrylate; TEGDMA, Triethylene glycol dimethacrylate; Bis-EMA, Ethoxylated bisphenol A dimethacrylate; PPF, Prepolymerized filler.

    Table 2 Degree of conversion (DC) of two commercial dental composite resins measured at 2 hours and on 7 days after light-curing according to the shades (DC, mean ± SD; No., 10; unit, %)

    Table 3 Biaxial flexural strength of two commercial dental composite resins measured on 7 days after light-curing according to the shades (FS, mean ± SD; No., 10; unit, MPa)

    Table 4 Pearson product moment correlation between degree of conversion and biaxial flexural strength and shade components of each product measured before and after light-curing

    Table 1

    Table 2

    Table 3

    Table 4

    Restor Dent Endod : Restorative Dentistry & Endodontics
    © The Korean Academy of Conservative Dentistry.
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