PENGARUH PENAMBAHAN SERAT KACA PADA BAHAN BASIS GIGI TIRUAN NILON TERMOPLASTIK DAUR ULANG TERHADAP KEKUATAN TRANSVERSAL DAN MODULUS ELASTISITAS

Abstract

Introduction: Nylon were first introduced in the construction of denture bases in the 1950s. Nylon is manipulated by injection molding techniques. The technique produces sprue which can be recycled but causes a decrease in mechanical properties such as transverse strength and modulus of elasticity. To resolve this problem the Modifications were made with the addition of compatibility agent, they are virgin nylon and glass fiber expected to increase transversal strength and modulus of elasticity. Method: The design of this study is an experimental laboratory, posttest only control design. The sample of this study is a thermoplastic nylon rod-shaped test with 64 x 10 x 3,3 mm size. A total of 27 samples for 3 groups, then measured through a 3-point bending test. The value of transverse strength was analyzed using the Kruskal-Wallis test and modulus of elasticity was analyzed using ANOVA, then continued by using Mann-Whitney and LSD test to see the difference in values between groups. Result: The result of this study showed that there is a significant difference in transverse strength and modulus of elasticity between a combination of 60% virgin nylon 40% recycled nylon and recycled nylon only with the addition of glass fiber, the p-value = 0,038 (p < 0,05) and p = 0,0001 (p < 0,05), virgin nylon and nylon combination with the addition of glass fiber, the p-value = 0,0001 (p < 0,05) and p = 0,0001 (p < 0,05), and also nylon combination with the addition of glass fiber and recycled nylon with the addition of glass fiber, the p-value = 0,0001 (p < 0,05) and p = 0,0001 (p < 0,05). Conclusion: Nylon combination with the addition of glass fiber has a better value than virgin nylon.