J Korean Acad Conserv Dent.  2009 Jul;34(4):364-370. 10.5395/JKACD.2009.34.4.364.

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

Affiliations
  • 1Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea. inboglee@snu.ac.kr

Abstract

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 350omega, 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 (alpha=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.

Keyword

fiber-reinforced composite; longitudinal direction; transversal direction; polymerization shrinkage; strain gage; linear variable differential transformer

MeSH Terms

Barium Compounds
Bisphenol A-Glycidyl Methacrylate
Composite Resins
Displacement (Psychology)
Electrons
Glass
Polymerization
Polymers
Silicon Dioxide
Splints
Sprains and Strains
Barium Compounds
Bisphenol A-Glycidyl Methacrylate
Composite Resins
Polymers
Silicon Dioxide
Full Text Links
  • JKACD
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
    DB Error: unknown error