Oral dentures are subjected to mechanical and chemical cleansing processes. However, these processes alter the physical and mechanical properties of denture acrylic resins. This study analyzes the surface roughness of conventional heat-cured (HC) polymethacrylate, light-cured (LC) urethane dimethacrylate, and prepolymerized computer-aided design/computer-aided manufacturing (CAD/CAM) dental acrylic resins. The materials were subjected to combined surface treatment of mechanical brushing, thermal cycling, and immersion in chemical disinfectants (corega, chlorhexidine gluconate [CHG], and sodium hypochlorite) to simulate 1 year of clinical use. The surface roughness of the resin specimens before and after surface treatment was evaluated using a noncontact profilometer. Statistical tests based on analysis of variance revealed significant interactions between resin type and disinfectants, indicating that the effects of these two factors were interdependent. The highest and lowest surface roughness was observed in HC resins immersed in CHG and CAD/CAM resins immersed in sodium hypochlorite. Among the materials, HC resins demonstrated the overall highest mean roughness, followed by LC and CAD/CAM resins. Regarding the disinfectant use, the highest mean roughness was observed in disks immersed in CHG, followed by those immersed in corega and sodium hypochlorite. The prepolymerized CAD/CAM acrylic resin demonstrated superior surface quality following combined surface treatments. The HC and LC resins exceeded the roughness threshold and the reported roughness values for acrylic resins following surface treatments. Among the disinfectants tested, sodium hypochlorite produced overall low roughness values.
The influence of saliva pH on the adhesion of Candida albicans to PMMA-based prosthetic materials manufactured using conventional and digital techniques (3D printing, milling) was examined. The obtained data were subjected to statistical analysis using one-way ANOVA and the Tukey HSD post hoc test (α = 0.05). Materials obtained by 3D printing had the highest surface roughness, while those obtained conventionally had the highest number of CFU (colony-forming unit). The mean CFU value was highest at pH 4.5 and statistically significant compared to other pH values. No significant correlation was found between surface roughness and the average CFU value. The surface of materials obtained using the conventional and milling methods showed lower adhesion of Candida albicans.
PL
Zbadano wpływ pH śliny na adhezję Candida albicans do materiałów protetycznych na bazie PMMA, wytwarzanych technikami konwencjonalnymi i cyfrowymi (druk 3D, frezowanie). Otrzymane dane poddano analizie statystycznej za pomocą jednoczynnikowej analizy ANOVA oraz testu post hoc Tukeya HSD (α= 0,05). Materiały uzyskane metodą druku 3D wykazywały największą chropowatość powierzchni, a otrzymane konwencjonalnie charakteryzowały się największą liczbą CFU (ang. colony-forming unit). Średnia wartość CFU była największa przy pH 4,5 i statystycznie istotna w po¬równaniu z innymi wartościami pH. Nie stwierdzono znaczącej korelacji pomiędzy chropowatością powierzchni a średnią wartością CFU. Powierzchnia materiałów otrzymanych metodą konwencjonalną i metodą frezowania wykazywała mniejszą adhezję Candida albicans.
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