Fibrin Biopolymer Incorporated with Antimicrobial Agents: A Proposal for Coating Denture Bases

The characteristics of the denture base surface, in combination with the oral environment, promote the colonization and development of biofilm, which is the main cause of denture stomatitis. This study evaluated the effectiveness of fibrin biopolymer with digluconate chlorhexidine or alcoholic extract to prevent biofilm. Conventional heat polymerized and pre-polymerized poly(methyl methacrylate) (PMMA) circular specimens (10 × 2 mm) were fabricated ( = 504) and randomly divided into groups: no treatment (control-CT), fibrin biopolymer coating (FB), fibrin biopolymer with (FBPg), or digluconate of chlorhexidine (FBCh) coating. The specimens were inoculated with SC5314 (1 × 10 cells/mL) and incubated for 24, 48, and 72 h. Crystal violet and colony-forming unit assays were used to quantify the total biofilm biomass and biofilm-living cells. A qualitative analysis was performed using confocal laser scanning microscopy. Data obtained are expressed as means and standard deviations and were statistically analyzed using a three-way analysis of variance (α = 0.05). The FBPg and FBCh groups inhibited the growth of biofilm in both PMMA materials analyzed, with FBCh performing better in all periods evaluated ( < 0.0001). The colony forming unit (CFU) assay showed that the FB group favored the biofilm growth at 24 h and 48 h ( < 0.0001), with no differences with CT group at 72 h ( = 0.790). All groups showed an enhancement in biofilm development up to 72 h ( < 0.0001), except the FBCh group ( = 0.100). No statistical differences were found between the PMMA base materials ( > 0.050), except in the FB group ( < 0.0001). Fibrin biopolymer, albeit a scaffold for the growth of when combined with chlorhexidine digluconate or , demonstrated excellent performance as a drug delivery system, preventing and controlling the formation of denture biofilm.