Investigation of colour stability, hardness, and roughness of different denture base materials after immersing in different denture cleansers

Abstract

Objective: cleaning denture base materials may affect their physical and mechanical properties. Soaking these materials in chemical solution have a positive impact in removing food debris and disturb biofilm formation. However, using a soaking solution for a long time negatively affects the surface roughness and colour stability of all denture base materials. This study investigates the effect of denture cleansers on surface roughness and colour stability of two different denture base materials (PMMA and Valplast). The null hypothesis for this study is that PMMA and Valplast surface roughness and colour stability are not affected by immersion in denture cleansers. Methods: PMMA (n=33) and Valplast (N=33) samples were immersed in 4 different solutions (distilled water, FDC, Poligrip and Clinsodent) for 28 days. Samples were scanned by SEM, and surface roughness and colour were measured before and after immersion. In addition, data were analysed to evaluate the effect of each denture cleanser on each denture base material. Results: Data showed no statistically significant differences between the subgroups of each material before and after 28 days of immersion in terms of surface roughness and colour stability. Conclusion: PMMA and Valplast surface roughness and colour are not significantly changed after 28 days of immersion. Therefore, the null hypothesis is accepted.