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Evaluation of polymerization shrinkage stress in silorane-based composites
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HOME > Restor Dent Endod > Volume 36(3); 2011 > Article
Basic Research Evaluation of polymerization shrinkage stress in silorane-based composites
Seung-Ji Ryu, DDS, Ji-Hoon Cheon, DDS, Jeong-Bum Min, DDS, PhD
Journal of Korean Academy of Conservative Dentistry 2011;36(3):188-195.
DOI: https://doi.org/10.5395/JKACD.2011.36.3.188
Published online: May 31, 2011

Department of Conservative Dentistry, Chosun University School of Dentistry, Gwangju, Korea.

Correspondence to Jeong-Bum Min, DDS, PhD. Professor, Department of Conservative Dentistry, Chosun University School of Dentistry, Gwangju, Korea. TEL, +82-62-220-3840; FAX, +82-62-223-9064; minjb@chosun.ac.kr
• Received: March 6, 2011   • Revised: April 29, 2011   • Accepted: April 29, 2011

Copyright © 2011 Korean Academy of Conservative Dentistry

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  • Objectives
    The purpose of this study was to evaluate the polymerization shrinkage stress among conventional methacrylate-based composite resins and a silorane-based composite resin.
  • Materials and Methods
    The strain gauge method was used for the determination of polymerization shrinkage strain. Specimens were divided by 3 groups according to various composite materials. Filtek Z-250 (3M ESPE) and Filtek P-60 (3M ESPE) were used as a conventional methacrylate-based composites and Filtek P-90 (3M ESPE) was used as a silorane-based composites. Measurements were recorded at each 1 second for the total of 800 seconds including the periods of light application. The results of polymerization shrinkage stress were statistically analyzed using One way ANOVA and Tukey test (p = 0.05).
  • Results
    The polymerization shrinkage stress of a silorane-based composite resin was lower than those of conventional methacrylate-based composite resins (p < 0.05). The shrinkage stress between methacrylate-based composite resin groups did not show significant difference (p > 0.05).
  • Conclusions
    Within the limitation of this study, silorane-based composites showed lower polymerization shrinkage stress than methacrylate-based composites. We need to investigate more into polymerization shrinkage stress with regard to elastic modulus of silorane-based composites for the precise result.
  • Keywords: Methacrylate composite; Polymerization shrinkage stress; Silorane composite; Strain gauge
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Figure 1
Structure of strain gauge.
jkacd-36-188-g001.jpg
Figure 2
Schematic diagram of specimen and preparation.
jkacd-36-188-g002.jpg
Figure 3
Analysis of stress in a thick-walled acrylic ring.
jkacd-36-188-g003.jpg
Figure 4
Change of shrinkage stress (MPa) in each group for 800 seconds.
jkacd-36-188-g004.jpg
Table 1
Composites used in the study
jkacd-36-188-i001.jpg
Table 2
Values of shrinkage stress in each group at each measuring time (MPa)

Mean ± SD, Different letters indicate significant difference between groups (p < 0.05).

SD, Standard deviation.

jkacd-36-188-i002.jpg

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        Evaluation of polymerization shrinkage stress in silorane-based composites
        J Korean Acad Conserv Dent. 2011;36(3):188-195.   Published online May 31, 2011
        DOI: https://doi.org/10.5395/JKACD.2011.36.3.188
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      Evaluation of polymerization shrinkage stress in silorane-based composites
      Image Image Image Image
      Figure 1 Structure of strain gauge.
      Figure 2 Schematic diagram of specimen and preparation.
      Figure 3 Analysis of stress in a thick-walled acrylic ring.
      Figure 4 Change of shrinkage stress (MPa) in each group for 800 seconds.

      Figure 1

      Figure 2

      Figure 3

      Figure 4

      Evaluation of polymerization shrinkage stress in silorane-based composites

      Composites used in the study

      Values of shrinkage stress in each group at each measuring time (MPa)

      Mean ± SD, Different letters indicate significant difference between groups (p < 0.05).

      SD, Standard deviation.
      Table 1 Composites used in the study

      Table 2 Values of shrinkage stress in each group at each measuring time (MPa)

      Mean ± SD, Different letters indicate significant difference between groups (p < 0.05).

      SD, Standard deviation.

      Table 1

      Table 2

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