The effectiveness of a solution containing sodium hypochlorite 0.5% in removing tea discoloration on heat-cured acrylic resin

Abstract

Sodium hypochlorite (NaOCl) 0.5% is a solution that can be used as a disinfectant on heat-cured acrylic resin by immersion for 10 minutes. This study aimed to determine the effectiveness of a cloth bleaching agent (Bayclin) containing NaOCl 0.5% in removing tea stains from the heat-cured acrylic resin (QC-20). A total of 24 specimens of acrylic resin were used in this study. The specimens were immersed in NaOCl 0.5% solution and Aquadest as a control for five and 10 minutes. The color of the acrylic resin was measured with a spectrophotometer (VITA Easyshade) before and after tea staining, and after immersion. The color differences of the acrylic resin were characterized using the CIE L∗a∗b∗ system. The data were analyzed using dependent and independent t-tests with 0.05 significance level. The percentage of stain removal was 98.5% and 106.9% for acrylic resin immersed in NaOCl 0.5% solution for five and 10 minutes, respectively. Therefore, a cloth bleaching agent containing NaOCl 0.5% was effective in removing tea stains from heat-cured acrylic resin after five minutes of immersion.