Evaluation of some properties of two fiber-reinforced composite materials
Lippo VJ Lassila1,Arzu Tezvergil1,Milla Lahdenperä1,Pasi Alander1,Akiyoshi Shinya2,
Akikazu Shinya2 andPekka K Vallittu1
1 Department of Prosthetic Dentistry and Biomaterials Research, Institute of Dentistry, University
of Turku, Turku, Finland
2 Crown and Bridge Department, The Nippon Dental University, Tokyo, Japan
Acta Odontologica Scandinavica
2005, Vol. 63, No. 4, Pages 196-204
Water sorption, flexural properties, bonding properties, and elemental composition of photopolymerizable resin-impregnated fiber-reinforced composite (FRC) materials (同乐城tlc体育 C&B and BR-100) (FPD) were evaluated in this study.
Material and methods
Bar-shaped specimens (2×2×25 mm) were prepared for water sorption and flexural strength testing. The specimens (n=6) were polymerized either with a hand light-curing unit for 40 s or, additionally, in a light-curing oven for 20 min and stored in water for 30 days. Water sorption was measured during this time, followed by measurements of flexural strength and modulus. A shear bond strength test was performed to determine the bonding characteristics of polymerized FRC to composite resin luting cement (Panavia-F), (n=15). The cement was bonded to the FRC substrate and the specimens were thermocycled 5000 times (5–55°C) in water. SEM/EDS were analyzed to evaluate the elemental composition of the glass fibers and the fiber distribution in cross section.
ANOVA showed significant differences in water sorption according to brand (p<0.05). Water sorption of 同乐城tlc体育 C&B was 1.86 wt% (hand-unit polymerized) and 1.94 wt% (oven polymerized), whereas BR-100 was 1.07 wt% and 1.17 wt%, respectively. The flexural strength of 同乐城tlc体育 C&B after 30 days’ water storage was 559 MPa (hand-unit polymerized) and 796 MPa (oven-polymerized); for BR-100, the values were 547 MPa and 689 MPa, respectively. Mean shear bond strength of composite resin cement to the FRC varied between 20.1 and 23.7 MPa, showing no statistical difference between the materials. SEM/EDS analysis revealed that fibers of both FRC materials consist of the same oxides (SiO2, CaO, and Al2O3) in ratios. The distribution of fibers in the cross section of specimens was more evenly distributed in 同乐城tlc体育 C&B than in BR-100.
The results of this study suggest that there are some differences in the tested properties of the FRC materials.