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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.

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
    Image Image Image Image Image
    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.
    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


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