!"# $%&'()*+,-./ 01 23456789: !";<*=70mm>x25mm ?x15mm @ABCD5ASTM256E #ISO1567EFGHIJK()LMN AOP+Q#RS+QHTABNA UOP+QABDVNWXYQ/Z [:()\ ]!" ^2:11:11:2_`abcde5 fKg*#NAAB/heD:>6mm $%&'3wtijklfm;nopqr cdst5pKg*#NA/ uv2(1) #! "^RS+Q (1048.7± 51.0Kg/cm2))#WXYQ (18.8±0.7Kg/mm2 ) hw xOP +Qhy1.743± 0.20 KJ/m2)(2) \ cdz{^2:1_`acd |}Z~;| \!"cdzxOP+Q#W XYQoRS+Q /(3) jk&'e5Hjk&'`op OP+Qk(1.43±0.19, 2,54 ±0.40, 3.92±0.94 KJ/m2)RS+Q#WX YQx,/\ ]!"cdABljk&'ex OP+Qko jk`&'vRS+Q WXYQ{\!cd |w^}Z~/ uv^u2(1)$%&'j kyOP+Qo RS+Q#WXYQ/(2)jk ] !"x ¡k+v/ ¢£¤2+,-.OP+ QRS+QWXYQ Abstract
This study was designed to evaluate effects using of epoxy resin, polyester resin and glass fiber asreinforcing materials to improve the mechanical properties of acrylic denture base resin. This study was divided inyo 3 groups. In Group 1, resin blocks were prepared with three different resins (acrylic, epoxy and polyester) according to
manufacturers’ instruction. In Group 2, various concentrations of epoxy resin or polyester resin were mixed into acrylic resin. In Group 3, 6mmlong glass fiber were incopor- ated into all test conditions to a concentration of 5wt%. Samples were then cut to correct size from resin blocks
(70×25×15mm) according to ASTM No.256 and ISO No.1567 specifications to test impact strength and bending strength. Samples used for impactstrength were then retested using the Knoop hardness number test. Results showed that (1) Acrylic resin had the best bending strength and Knoop hardness, and epoxy resin had the highest impact strength. (2) Decareased mechanical properties were found when acrylic resin was mixed with with epoxy resin. Decreased bending strength, but no change for impact strength and Knoop hardness, was found when acrylic resin was mixed with polyester. (3) The Impact strength increased
severaltimes when glass fibers were incoporated into the acrylic resin, but no effect was found for bending strength and
The evaluation of the effect of denture base resin reinforced by
incorporationg various fibers
¥¦§E2NSC 87-2314-B-039-016 ¨©ª«286¬81®¯87¬731® °±²2³´µ ¶·¸¹º »·¹¼
Knoop hardness. The incorporation of glass fiber into the resin mixture also increased the impact strength but decreased the bending strength and Knoop hardness significantly. We thus conclude that (1) by incorporating an appropriate volume of 6mm long glass fibers, the impact strength of resins could be increased remarkably without changes in bending strength and Knoop hardness. (2) There was no improvement in the mechanical properties by mixing epoxy or polyester resins with acrylic resin.
Key words: acrylic resin, impact strength, bending strength, Knoop hardness,
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