Eradication of a mature methicillin-resistant Staphylococcus aureus (MRSA) biofilm from acrylic surfaces.
Methicillin-resistant Staphylococcus aureus (MRSA) can grow as structured biofilm in different surfaces, including oral mucosa and denture surfaces. Such biofilms can be released into the oral fluids and aspirated, causing systemic infections such as aspiration pneumonia. This study evaluated the efficacy of two disinfectant solutions and microwave irradiation in disinfecting acrylic specimens contaminated with MRSA biofilm. Thirty-six acrylic specimens were made, sterilized and contaminated with MRSA (107 cfu/mL). After incubation (37 °C/48 h), the specimens were divided into 4 groups: not disinfected (positive control); soaking in 1% sodium hypochlorite for 10 min; soaking in 2% chlorhexidine gluconate for 10 min; and irradiating by microwave for 3 min at 650 W. The viability of cells was evaluated by XTT reduction method. All specimens from the positive control group showed biofilm formation after 48 h incubation. The mean absorbance value of the control specimens was 1.58 (OD at 492 nm). No evidence of biofilm formation was observed on specimens after the disinfection methods. Disinfection by soaking in 1% sodium hypochlorite and 2% chlorhexidine gluconate and irradiating by microwaves resulted in 100% reduction of MRSA biofilm metabolism. The use of chemical solutions and microwave irradiation was shown to be effective for eradicating mature MRSA biofilms on acrylic resin specimens.
Karen Tereza
KT
Altieri
Paula Volpato
PV
Sanitá
Ana Lucia
AL
Machado
Eunice Teresinha
ET
Giampaolo
Ana Cláudia
AC
Pavarina
Janaina Habib
JH
Jorge
Carlos Eduardo
CE
Vergani
D000179:Acrylates; D018441:Biofilms; D002710:Chlorhexidine / Q000494:pharmacology; D004202:Disinfectants / Q000494:pharmacology*; D055624:Methicillin-Resistant Staphylococcus aureus / Q000187:drug effects* / Q000528:radiation effects; D008872:Microwaves; D012973:Sodium Hypochlorite / Q000494:pharmacology; D013499:Surface Properties
D000179:Acrylates; D004202:Disinfectants; D012973:Sodium Hypochlorite; D002710:Chlorhexidine