Effect of Immersion Timein Rosellatea (Hibiscus Sasabdarifa) on the Dimensional Change Ofheat-Curedacrylic Resin

Abstract

Heat Cured acrylic resin had dimensional Changes when immersed into the liquid. One several characters of acrylic resin is absorbing the water which could influenced by composition duration and kinds of the soluble. The kinds of sour soluble such as rosella tea could made the erosion and decrease the superfisical strain of acrylic resin material which easier the penetration of liquid molecules. The study was aimed to analyze the effect of immersed duration of heat cured acrylic resin into the rosella tea drinks for 3,5,7, and 9 days on the dimensional changes. The specimens of this study was cylinder shape with 50 ± 1mm diameter and 0,5 ± 0,1 mm thickness. Twenty specimen was immersed into distilled water for 24 hours to minimize the residual monomer thenwas dried using desiccators and the weight was measured before treatment(W1). All specimens were divided into 2 groups which 10 specimens was immersed in rosella tea and 10 specimens was immersed in distilled water (control) for 3, 5, 7 and 9 days. Then the final weight of each application was measured using analytic balance. The data was analyzed using repeated Anova and continued with pairwise Comparison. Based on analysis shown that there was significant different of dimensional changes after immersed in the rosella tea for 3,5,7 and 9 (p < 0,05) significant different of (P>0,05) dimensional changes between 3 to 9 days. It can be concluded that there was the effect of immersed duration heat cured acrylic resin into the rosella tea on the dimensional changes.