The effect of length and concentration of glass fibers on the mechanical properties of an injection- and a compression-molded denture base polymer☆
Section snippets
Material and methods
Twenty test groups, each containing 10 specimens were used for transverse strength, modulus of elasticity, and impact strength tests. Control groups, without any fiber reinforcement (n=10 per test), were prepared for both compression and injection molding (Table I).
Results
The mean values and SEs of the transverse strength, modulus of elasticity, and impact strength tests are shown in Fig. 1, Fig. 2, Fig. 3, respectively, and the mean subsets for Tukey analysis are shown in all 3 figures. The results of 3-factor ANOVA showed that processing method and fiber volume had a significant effect (P < .05) on transverse strength (Table II), modulus of elasticity (Table III), and impact strength (Table IV), whereas fiber length showed a significant effect on transverse
Discussion
This study compared the transverse strength, modulus of elasticity, and impact strength of chopped E-glass fiber-reinforced injection or compression molded denture base polymer with various lengths and concentrations. For the chopped fiber-reinforced composites, the fibers are oriented randomly in the matrix, which has a continuous phase. Fiber reinforcement is only effective if the stress can be transferred from the polymer matrix to the fiber.39, 45 This is achieved if the fibers have a
Conclusions
Within the limitations of this in vitro study, it was demonstrated that 6-mm chopped glass fibers with 5% fiber in combination with the injection-molding technique can result in a significant increase in the transverse strength, elastic modulus, and impact strength of the denture base polymer.
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The material used for this study was bought by the Cumhuriyet University Research Funding, funding of the Finnish Technology Agency (TEKES) and CIMO Fellowship Grant.