Effect of different polishing methods applied to denture base materials on microbial adhesion and surface roughness

Abstract

Aim: The aim of our study was to investigate the effect of various polishing processes applied to different types of PMMA (polymethyl methacrylate) denture base materials on the surface roughness and microbial adhesion of the base material.

Methods: Sixty specimens were prepared from heat-polymerized conventional PMMA (G), injectable PMMA (E), and pre-polymerized CAD-CAM PMMA (C) denture base materials. All the sample surfaces were sanded with silicon carbide abrasives of 800, 1000, 1200, and 2500 grit. The specimens of each denture base material were divided into three subgroups (n=20), in which different polishing methods were applied. The first group was mechanically polished (M), and the other two groups were chemically polished with light-polymerized glaze liquids [Palaseal (Ps), Optiglaze Color (Og)]. A profilometer was used to evaluate the surface roughness. Colony counting was performed to assess bacterial colonization after one day. The data obtained from all these measurements were evaluated using Analysis of Variance and Bonferroni Corrected test was used for multiple comparisons of means (p = 0.05). The interaction between surface roughness and bacterial colonization was examined using the Pearson’s correlation test. Regression analysis was performed to determine the relationships between them.

Results: When PMMA base materials were compared, the lowest average surface roughness (Ra) and bacterial colonization values were obtained in Group C. When the polishing methods were compared, the lowest average surface roughness values were obtained for Group M. As a result of the bacterial colonization measurement, lower colonization values were obtained with standardized mechanical polishing compared to the other groups.

Conclusion: There was no difference between the different PMMA base materials in terms of surface roughness; however, there were statistically significant differences in bacterial colonization. Our study showed that mechanical polishing yielded better results than light-activated glazing agents.

How to cite this article:

Yarar S, Değer Y, Tekin S. Effect of different polishing methods applied to denture base materials on microbial adhesion and surface roughness. J Med Dent Invest 2023; 4: e230351. https://doi.org/10.5577/jomdi.e230351