Influência de tratamentos de superfície na adesão de Candida albicans, propriedades ópticas e físicas de resinas acrílicas para bases de dentaduras.

Abstract

Acrylic resins used in complete dentures, especially those produced by 3D printing, present greater susceptibility to surface roughness and microbial adhesion, compromising their durability and clinical biosafety. To address this issue, the present study aimed to determine whether the application of a photo-curable glaze can reduce surface roughness and Candida albicans adhesion, as well as improve the optical properties of the main acrylic resins available for denture bases. The purpose of this study was to evaluate the optical and surface properties and Candida albicans adhesion on milled and 3D-printed denture base resins fabricated using the CAD/CAM system, compared with conventional heat-polymerized resin, subjected to different surface treatments (mechanical polishing and photo-curable glaze). A total of 60 denture base resin specimens were fabricated and divided into three types of resins (n=20), each subdivided into two surface treatment groups (n=10). C. albicans (ATCC 90028) adhesion was assessed by counting colony forming units (CFU), optical stability was measured using the CIEDE 2000 system (ΔE00), and surface roughness was evaluated using Ra. Data were analyzed using two-way ANOVA (p<0.05). Among the different resin types, a significant difference was found for the 3D printed resin regarding color variation (ΔE; p<0.05). Regarding the surface treatments, the photo-curable glaze demonstrated significant differences in all evaluated properties and reduced C. albicans adhesion compared with mechanical polishing (p<0.05). It is concluded that the photo-curable glaze significantly improved the optical and surface properties of denture base resins and reduced C. albicans adhesion, demonstrating clinical potential for greater prosthetic durability and biosafety. The favorable surface and optical properties of provisional restorations, especially those fabricated by CAD/CAM systems, both before and after aging, indicate acceptable clinical performance, long-term durability, and lower microbial adhesion, supporting professional and patient acceptance.