Effect of fiber direction on the polymerization shrinkage of fiber-reinforced composites.
10.5395/JKACD.2009.34.4.364
- Author:
Joongwon YOM
1
;
In Bog LEE
Author Information
1. Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea. inboglee@snu.ac.kr
- Publication Type:Original Article
- Keywords:
fiber-reinforced composite;
longitudinal direction;
transversal direction;
polymerization shrinkage;
strain gage;
linear variable differential transformer
- MeSH:
Barium Compounds;
Bisphenol A-Glycidyl Methacrylate;
Composite Resins;
Displacement (Psychology);
Electrons;
Glass;
Polymerization;
Polymers;
Silicon Dioxide;
Splints;
Sprains and Strains
- From:Journal of Korean Academy of Conservative Dentistry
2009;34(4):364-370
- CountryRepublic of Korea
- Language:Korean
-
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.
