INFLUENCE OF SURFACE TREATMENTS IN THE DISINFECTION OF THE EXTERNAL SURFACES OF THERMOPOLYMERIZED ACRYLIG RESINS
DOI:
https://doi.org/10.15332/us.v9i1.1192Keywords:
Chemical disinfection, Acrylic resin, Complete denture, Glutaraldheyde, Sodium hypochloriteAbstract
Objective: To evaluate the influence of surface treatments in the disinfection of the external surfaces of thermopolymerized acrylic resin and determine the time required for disinfection.
Methods: Two hundred and fifty rectangular specimens were fabricated (65x10x3mm), one side of the specimen was polished with silicon carbide paper and rag wheel and polishing pastes (pumice and water, followed by zinc oxide and water), the other side received no treatment, thus simulating both sides of a complete denture. After sterilization with ethylene oxide, the specimens were immersed for 24 hours in culture media containing strains of Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans, Streptococcus mutans and Enterococcus faecalis. After this period, the specimens were rinsed with sterile water and disinfected for 5, 10 and 15 minutes with 1% and 2% sodium hypochlorite and 2% glutaraldehyde. Then they were cultured in contact of the external surfaces, smooth and rough, and incubated for 20 days, microbial growth was evaluated by visual method. Statistical analysis was performed using the Fisher exact test comparing the two samples to two.
Results: There was no statistical difference between the disinfectant solutions, the disinfection times and microorganisms analyzed.
Conclusion: It is concluded that the period of 10 minutes was adequate for disinfection of the external surfaces of acrylic resin with all disinfectant solutions evaluated and finishing and polishing surfaces did not influence the effectiveness of disinfection.
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