| 3249 Effect of Fillers on The Fiber Reinforced Acrylic Resin | ||
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S.Y. CHEN, China Medical University, Taichung, Taiwan Objectives: This study was designed to evaluate improvements in the mechanical properties of fiber reinforced acrylic resin by adding 4 kinds of fillers (Clay, Glass powder, SiO2, ZrO2). Methods: The mixtures of filler containing resin and fiber were cured at 70oC in a water bath for 15 hours, then at 90oC for 1 hour, in 70 x 25 x 15 mm stone molds, which were enclosed by dental flasks. The cured resin blocks were cut to an appropriate size and tested for impact strength and bending strength following the methods of ASTM Specification No.256 and ISO Specification No.1567, respectively. Specimens used in the impact strength test were reused for the Knoop hardness test. One way ANOVA and scheffe's test were used to compare the difference between baseline materials and filler contained materials of each property for each adding percentage. The significance level was set at P = 0.05, two-tailed. Results: On fiber and filler containing specimens, the impact strength showed increasing on small volume addition, but decreased in large volume tendency. The best result was incorporated 10w/w% SiO2 powder (8.49±1.51 kJ/m2). On bending strength, all the filler containing data revealed decreasing tendency excepted adding 1.0 g of glass powder (1176.74±19.56 kgf/cm2) or SiO2 powder (1111.11±22.96 kgf/cm2) Knoop hardness showed the tendency of increasing with fillers contained especially by adding the SiO2 powder. The best result was by adding 40 w/w % of SiO2 powder (25.02±2.53 kgf/mm2) Conclusion: It is concluded that, all the fillers showed the strengthening effect on impact strength and surface hardness, but negative effect on bending strength except by loading 2 w/w % glass powder or SiO2, when three mechanical properties are taken into consideration, adding 2 w/w% of SiO2 into the polyester fiber reinforced acrylic resin was the best condition. | ||
| Seq #344 - Prosthodontic Polymers 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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Back to the Dental Materials: VI - Polymer Materials-Mechanical Properties and Degradation Program
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