Evaluation of the effect of tobacco leaf (Nicotiana tabacum L.) denture cleaning paste on surface roughness and colour change of thermoplastic nylon

Thermoplastic nylon is an alternative denture base for patients allergic to residual monomers. The research results prove that 75% tobacco leaf extract (TLE) is fungistatic on thermoplastic nylon. This study evaluates the roughness and colour of thermoplastic nylon plates brushed with TLE paste. The post-test-only control group was designed to test changes in surface roughness, and the pre-post-test control group was designed to test colour changes in thermoplastic nylon plates (TNP). The sample group measuring the roughness and colour change of TNP consisted of the electrically brushed control group (K1), the electrically brushed placebo paste group (K2), and the electrically brushed 75% TLE paste group. (K3). We brushed for 23.5 minutes to test surface roughness and 3.90 minutes to test colour changes. The sample shape is a TNP 60x10x2.5 mm for testing surface roughness and 10x10x2.5 mm for testing colour changes with a colour reader. The research results were analyzed using the Kolmogorov-Smirnov and Levene tests, followed by a parametric one-way ANOVA with a significance level of 0.05. Results: There were no differences in surface roughness and colour changes in TNP after brushing with 75% tobacco leaf extract (p>0.05).  The use of 75% TLE paste has no effect in increasing the surface roughness of TNP below the threshold value of 0.2 μm and does not have a significant impact on changing the colour of TNP with a value of ΔE ≤ 3.70.