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Effect of fiber direction on the polymerization shrinkage of fiber-reinforced composites
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Original Article Effect of fiber direction on the polymerization shrinkage of fiber-reinforced composites
Joongwon Yom, In-Bog Lee
Journal of Korean Academy of Conservative Dentistry 2009;34(4):364-370.
DOI: https://doi.org/10.5395/JKACD.2009.34.4.364
Published online: July 31, 2009

Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea.

Corresponding Author: In-Bog Lee. Department of Conservative Dentistry, School of Dentistry, Seoul National University, 275-1 Yeongeon-Dong, Jongno-Gu, Seoul, 110-768, Korea. Tel: 82-2-2072-3953, Fax: 82-2-2072-3859, inboglee@snu.ac.kr
• Received: May 11, 2009   • Revised: May 31, 2009   • Accepted: June 25, 2009

Copyright © 2009 The Korean Academy of Conservative Dentistry

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  • The aim of this study was to evaluate the effect of fiber direction on the polymerization shrinkage of fiber-reinforced composite. The disc-shaped flowable composite specimens (d = 10 mm, h = 2 mm, Aeliteflo A2, Bisco, Inc., IL, USA) with or without glass fiber bundle (X-80821P Glass Fiber, Bisco, Inc., IL, USA) inside were prepared, and the longitudinal and transversal polymerization shrinkage of the specimens on radial plane were measured with strain gages (Linear S-series 350ω, CAS, Seoul, Korea). In order to measure the free polymerization shrinkage of the flowable composite itself, the disc-shaped specimens (d = 7 mm, h = 1 mm) without fiber were prepared, and the axial shrinkage was measured with an LVDT (linear variable differential transformer) displacement sensor. The cross-section of the polymerized specimens was observed with a scanning electron microscope to examine the arrangement of the fiber bundle in composite. The mean polymerization shrinkage value of each specimen group was analyzed with ANOVA and Scheffe post-hoc test (α=0.05).
    The radial polymerization shrinkage of fiber-reinforced composite was decreased in the longitudinal direction of fiber, but increased in the transversal direction of fiber (p<0.05). We can conclude that the polymerization shrinkage of fiber-reinforced composite splint or restoratives is dependent on the direction of fiber.
  • Keywords: fiber-reinforced composite; longitudinal direction; transversal direction; polymerization shrinkage; strain gage; linear variable differential transformer
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Figure 1
a) Experimental setup for the measurement of radial linear shrinkage using a strain gage.
b) Definition of directions on a disc shaped specimen in the measurement.
jkacd-34-364-g001.jpg
Figure 2
Electric circuit design for the strain measurement (Vo: output voltage, Va: voltage between two fixed resistances, Vb: voltage between two strain gages, Vs: input voltage, R: fixed resistance, ΔR: resistance difference, SG: strain gage).
jkacd-34-364-g002.jpg
Figure 3
Experimental setup for the measurement of axial linear shrinkage using an LVDT probe.
jkacd-34-364-g003.jpg
Figure 4
a) Representative curves of radial shrinkage strains for composite specimens as a function of time.
b) Post-gel shrinkage strains for four groups.
jkacd-34-364-g004.jpg
Figure 5
SEM photomicrographs showing the cross-section of composite specimens.
a) Some voids were observed between fibers. The arrows show fiber bundles (F).
b) There was an intimate contact between the strain gage and composite. The arrow shows the strain gage (SG).
jkacd-34-364-g005.jpg
Table 1
Post-gel radial shrinkage strain measured using a strain gage for composite specimens at 600 s.

*Superscript letters mean statistically significant difference.

jkacd-34-364-i001.jpg

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        Effect of fiber direction on the polymerization shrinkage of fiber-reinforced composites
        J Korean Acad Conserv Dent. 2009;34(4):364-370.   Published online July 31, 2009
        DOI: https://doi.org/10.5395/JKACD.2009.34.4.364
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      Related articles
      Effect of fiber direction on the polymerization shrinkage of fiber-reinforced composites
      Image Image Image Image Image
      Figure 1 a) Experimental setup for the measurement of radial linear shrinkage using a strain gage. b) Definition of directions on a disc shaped specimen in the measurement.
      Figure 2 Electric circuit design for the strain measurement (Vo: output voltage, Va: voltage between two fixed resistances, Vb: voltage between two strain gages, Vs: input voltage, R: fixed resistance, ΔR: resistance difference, SG: strain gage).
      Figure 3 Experimental setup for the measurement of axial linear shrinkage using an LVDT probe.
      Figure 4 a) Representative curves of radial shrinkage strains for composite specimens as a function of time. b) Post-gel shrinkage strains for four groups.
      Figure 5 SEM photomicrographs showing the cross-section of composite specimens. a) Some voids were observed between fibers. The arrows show fiber bundles (F). b) There was an intimate contact between the strain gage and composite. The arrow shows the strain gage (SG).

      Figure 1

      Figure 2

      Figure 3

      Figure 4

      Figure 5

      Effect of fiber direction on the polymerization shrinkage of fiber-reinforced composites

      Post-gel radial shrinkage strain measured using a strain gage for composite specimens at 600 s.

      *Superscript letters mean statistically significant difference.
      Table 1 Post-gel radial shrinkage strain measured using a strain gage for composite specimens at 600 s.

      *Superscript letters mean statistically significant difference.

      Table 1

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