Effects of restorative primers on bond strength of polymer- infiltrated

Abstract

This study aims to demonstrate the effect of time on tea staining on polyamide denture base and effect of different commercial brands of denture cleanser tablets on tea stain removal. The experiment proceeds by 120 polyamide samples (Valpast®), polished and initial color measurement (CIE L*a*b* system) with spectrophotometer while preparing tea solution using Lipton® in hot water then temperature control at 37 °C. Thereafter, samples were soaked into tea solution for various of time; 1 day, 1 week, 1 month and 3 months while renewing tea solution every day. Samples were divided into 3 groups for three different denture cleanser tablet brand; Bony Plus®, Fitty Dent® and Polident®. When we reached to the immersion time, the samples were done for the second color measurement, then compared to the color value from initial measurement (ΔE1), afterwards, immersed all samples into denture cleansers and performed the final color measurement, then compared to the color value from the second measurement (ΔE2) with the clinically perceptible color change value (ΔE 3.3). The data analysis was analyzed by SPSS V 20. The results show mean of ΔE1; the group of 1 day and 1 week are less than 3.3, indicate indivisibility to detect clinically. On the other hand, the group of 1 month and 3 months are more than 3.3. The time period of 3 months was used for evaluate the effectiveness of denture cleanser. After soaked into denture cleanser; Bony Plus® shows the highest ΔE2. There are no significantly different among ΔE2 of three commercial brands. The mean of ΔE2 of all groups are less than 3.3. In conclusion, there is the highest clinically perceptible color change after immersed denture in tea solution for 3 months. All commercial brand of denture cleanser tablets affect the tea stain removal, but indivisibility to detect clinically.