Effect of Thermocycling And E-Glass Fiber Addition on Water Sorption And Color Stability of Thermoplastic Nylon Denture Base Material

Abstract

Background /purpose : The aim of this in vitro study wasto find out the effect of thermocycling and E-glass fiber addition on water sorption and color stability of nylon thermoplastic denture base material Materials and methods :Thirty samples of nylon thermoplastic denture base material were divided into 6 groups, consisting of group 1% and 1,5% E-glass fiber with and without thermocycling and group without E-glass fiber. Measurement of water sorption value by using analytical balance and color stability measurement by using UV Spectrophotometer. The effect of thermocycling on water sorption and color stability was analyzed with T test and the effect of E-fiber on water sorption and color stability was analyzed with one way ANOVA test. The comparison of effect among group without E-glass fiber, with 1% and 1,5% E-glass fiber with and without thermocycling was analyzed with LSD test. Results : There was an effect of thermocycling with 2000 cycle as the simulation of oral cavity condition for 2 years denture usage on water sorption and color stability in group without E-glass fiber and group with addition of 1% and 1,5% of E-glass fiber. One way ANOVA test showed that there was an effect of E-glass fiber addition on water sorption and color stability of nylon thermoplastic denture base material with and without thermocycling. Conclusion : According to this study, thermocycling shows an effect on water sorption and color stability. E-glass fiber addition to denture base material also affects water sorption and color stability as seen from discoloration of denture base material with the addition of 1% to 1,5% E-glass fiber in thermocycled group is not visible and acceptable (E < 3,3), while in group without E-glass fiber addition, discoloration is clearly seen visually and unacceptable (E > 3,3).