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HOME > Restor Dent Endod > Volume 32(1); 2007 > Article
Original Article Polymerization shrinkage of composite resins cured by variable light intensities
Mi-Young Lim1, Kyung-Mo Cho2, Chan-Ui Hong1
2007;32(1):-36.
DOI: https://doi.org/10.5395/JKACD.2007.32.1.028
Published online: January 31, 2007

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Corresponding Author: Chan-Ui Hong. Department of Conservative Dentistry, College of Dentistry, Dankook University, 7-1 Shinbu-dong, Cheonan, Korea. Tel: 82-41-550-1964, Fax: 82-41-550-1963, endohong@hanmail.net
• Received: December 4, 2006   • Revised: December 15, 2006   • Accepted: December 28, 2006

Copyright © 2007 Korean Academy of Conservative Dentistry

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  • The purpose of this study was to compare the effect of exponential curing method with conventional curing and soft start curing method on polymerization shrinkage of composite resins.
    Three brands of composite resins (Synergy Duo Shade, Z250, Filtek Supreme) and three brands of light curing units (Spectrum 800, Elipar Highlight, Elipar Trilight) were used. 40 seconds curing time was given. The shrinkage was measured using linometer for 90 seconds.
    The effect of time on polymerization shrinkage was analysed by one-way ANOVA and the effect of curing modes and materials on polymerization shrinkage at the time of 90s were analysed by two-way ANOVA. The shrinkage ratios at the time of 20s to 90s were taken and analysed the same way. The results were as follows:
    1. All the groups except Supreme shrank almost within 20s. Supreme cured by soft start and exponential curing had no further shrinkage after 30s (p < 0.05).
    2. Statistical analysis revealed that polymerization shrinkage varied among materials (p = 0.000) and curing modes (p = 0.003). There was no significant interaction between material and curing mode.
    3. The groups cured by exponential curing showed the statistically lower polymerization shrinkage at 90s than the groups cured by conventional curing and soft start curing (p < 0.05).
    4. The initial shrinkage ratios of soft start and exponential curing were statistically lower than conventional curing (p < 0.05).
    From this study, the use of low initial light intensities may reduce the polymerization rate and, as a result, reduce the stress of polymerization shrinkage.
  • Keywords: Polymerization shrinkage; Light intensities; Soft start; Exponential curing; Linometer; Polymerization rate
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Figure 1
Diagram of linometer.
jkacd-32-28-g001.jpg
Figure 2
Linear polymerization shrinkage of Synergy Duo Shade.
jkacd-32-28-g002.jpg
Figure 3
Linear polymerization shrinkage of Filtek Z250.
jkacd-32-28-g003.jpg
Figure 4
Linear polymerization shrinkage of Filtek Supreme.
jkacd-32-28-g004.jpg
Table 1
Linear polymerization shrinkage after 90 seconds with various curing modes (%)
jkacd-32-28-i001.jpg
Table 2
Two-factor analysis of variance for linear shrinkage at 90 seconds
jkacd-32-28-i002.jpg
Table 3
Homogeneous subsets of materials and curing modes at 90 seconds
jkacd-32-28-i003.jpg
Table 4
Linear polymerization shrinkage (%) at 20s and 90s and their ratio (%)(S.D)
jkacd-32-28-i004.jpg
Table 5
Two-factor analysis of variance for initial shrinkage ratios
jkacd-32-28-i005.jpg
Table 6
Homogeneous subsets of materials and curing modes of initial shrinkage ratios
jkacd-32-28-i006.jpg

Tables & Figures

REFERENCES

    Citations

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    • Degree of Conversion and Polymerization Shrinkage of Low and High Viscosity Bulk-Fill Giomer-based and Resin-based composites
      Heera Kim, Jaesik Lee, Hyunjung Kim, Taeyub Kwon, Soonhyeun Nam
      THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY.2019; 46(1): 1.     CrossRef
    • Effect of the exponential curing of composite resin on the microtensile dentin bond strength of adhesives
      So-Rae Seong, Duck-kyu Seo, In-Bog Lee, Ho-Hyun Son, Byeong-Hoon Cho
      Journal of Korean Academy of Conservative Dentistry.2010; 35(2): 125.     CrossRef

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      Polymerization shrinkage of composite resins cured by variable light intensities
      J Korean Acad Conserv Dent. 2007;32(1):28-36.   Published online January 31, 2007
      DOI: https://doi.org/10.5395/JKACD.2007.32.1.028
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    Figure
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    Polymerization shrinkage of composite resins cured by variable light intensities
    Image Image Image Image
    Figure 1 Diagram of linometer.
    Figure 2 Linear polymerization shrinkage of Synergy Duo Shade.
    Figure 3 Linear polymerization shrinkage of Filtek Z250.
    Figure 4 Linear polymerization shrinkage of Filtek Supreme.

    Figure 1

    Figure 2

    Figure 3

    Figure 4

    Polymerization shrinkage of composite resins cured by variable light intensities

    Linear polymerization shrinkage after 90 seconds with various curing modes (%)

    Two-factor analysis of variance for linear shrinkage at 90 seconds

    Homogeneous subsets of materials and curing modes at 90 seconds

    Linear polymerization shrinkage (%) at 20s and 90s and their ratio (%)(S.D)

    Two-factor analysis of variance for initial shrinkage ratios

    Homogeneous subsets of materials and curing modes of initial shrinkage ratios
    Table 1 Linear polymerization shrinkage after 90 seconds with various curing modes (%)

    Table 2 Two-factor analysis of variance for linear shrinkage at 90 seconds

    Table 3 Homogeneous subsets of materials and curing modes at 90 seconds

    Table 4 Linear polymerization shrinkage (%) at 20s and 90s and their ratio (%)(S.D)

    Table 5 Two-factor analysis of variance for initial shrinkage ratios

    Table 6 Homogeneous subsets of materials and curing modes of initial shrinkage ratios

    Table 1

    Table 2

    Table 3

    Table 4

    Table 5

    Table 6

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