<![CDATA[This study aimed to determine the effect of alkaline peroxide denture cleanser on the color stability of thermoplasticnylon denture base. This experimental laboratory research with pretest posttest with control group design used 24specimens of thermoplastic nylon (valplast) sized 20x20x2 mm as samples. Twelve specimens immersed in alkalineperoxide denture cleanser solution and the other twelve specimens immersed in aquadest as control. Time intervalsubmergence once for 1 hour, 8 hours and 12 hours each consisting of 4 specimens in alkaline peroxide solution and 4specimens in control solution. They were immersed in 8-hours time interval submergence times 7 by changing thesolution of alkaline peroxide every 8 hours, using 4 speciments for each solutions. Using ANOVA and independent ttest,it showed no significant color changes on thermoplastic nylon resin after immersed in alkaline peroxide solution  based on the time interval. However, there was significant color difference on the thermoplastic nylon resin immersed in alkaline peroxide and control solution at second to seventh interval of 8 hours immersed time with increase of time immersing. It was concluded that thermoplastic nylon resin have good stability although immerse in alkaline peroxide denture cleanser]]>
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