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KMID : 0362320090340040364
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Journal of Korean Academy of Operative Dentistry
2009 Volume.34 No. 4 p.364 ~ p.370
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EFFECT OF FIBER DIRECTION ON THE POLYMERIZATION SHRINKAGE OF FIBER-REINFORCED COMPOSITES
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Yom Joong-Won
Lee In-Bog
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Abstract
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The aim of this study was to evaluate the effect of fiber direction on the polymerization shrinkage of fiberreinforced 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 = 7mm, 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.
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KEYWORD
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fiber-reinforced composite, longitudinal direction, transversal direction, polymerization shrinkage, strain gage, linear variable differential transformer
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