Pengaruh perendaman cuka sari apel terhadap stabilitas warna dan kekuatan fleksural basis gigi tiruan nilon termoplastikThe effect of apple cider vinegar immersion on the colour stability and flexural strength of the thermoplastic nylon denture base

Abstract

Introduction: Thermoplastic nylon is a denture base material made of polyamide resin that needs to be cleaned regu-larly. Apple cider vinegar and Val-clean are used as denture cleaning agents, but they can affect physical and mechanical properties such as colour stability and flexural strength. The purpose of this study was to analyse the effect of immersion in 5% of apple cider vinegar on the colour stability and flexural strength of thermoplastic nylon denture bases. Methods: This research was an experimental laboratory with a post-test-only control group design. Forty-eight samples were fabricated with the size of 20x3 mm for colour stability test and 65x10x3±0.1 mm for flexural strength test, then divided into six sample groups. Colour stability was measured using a colourimeter and flexural strength using a Universal Testing Machine. Data analysis was performed with an ANOVA test. Results: After four days of immersion, colour stability showed no significant effect (p=0.124; p>0.05) between the 5% apple cider vinegar immersion group, Val-clean, and distilled water. While after eight days of immersion, the 5% apple cider vinegar immersion group, Val-clean, and distilled water showed a significant effect (p=0.035; p<0.05). ANOVA test on flexural strength showed a significant effect (p=0.001; p<0.05) between groups of 5% apple cider vinegar immersion, Val-clean, and distilled water after four and eight days of immersion. Conclusions: Thermoplastic nylon denture base is not recommended to be immersed in apple cider vinegar for cleaning because it can cause discolouration and reduce flexural strength.