Bacterial Colonization and Tissue Compatibility of Denture Base Resins

Area of Science:

• Dental Materials Science
• Microbiology
• Biocompatibility

Background:

• Limited clinical data exists on denture base biofilm composition and tissue compatibility.
• Polyamide is a hypoallergenic alternative to conventional polymethyl methacrylate (PMMA) resins.

Purpose of the Study:

• To compare bacterial colonization and tissue compatibility of polyamide versus PMMA denture base materials intraorally.
• To evaluate the genotoxic potential of these materials using micronuclei as a marker.

Main Methods:

• A randomized split-mouth design was used with 10 subjects.
• Polyamide and PMMA specimens were worn intraorally for four weeks.
• Bacterial colonization was assessed via cultivation and VITEK-MS identification; cytological smear tests evaluated micronuclei.

Main Results:

• A similar bacterial distribution was observed on both polyamide and PMMA specimens, with an average of 17.8 and 17.3 species, respectively.
• No significant differences in bacterial colonization or genotoxic potential (micronuclei) were detected between the two materials.
• Both materials supported the growth of diverse bacterial species, including potential pathogens.

Conclusions:

• Denture base resin material type does not significantly influence the composition of the four-week in situ bacterial biofilm.
• Polyamide and PMMA exhibit comparable tissue compatibility and bacterial colonization profiles.
• Both materials are suggested to be suitable for clinical application as denture base materials.