Open AccessAntimicrobial activity and physicochemical performance of a modified endodontic sealer
Author(s) -
Flávio de Oliveira Gonçalves,
Luiza Mello de Paiva Campos,
Luciana Katty Figueiredo Sanches,
Larissa Tavares Sampaio Silva,
Tiago C. dos Santos,
Gustavo H.C. Varca,
Diana Pereira Lopes,
Karina CogoMüller,
D.F. Parra,
Roberto Ruggiero Braga,
Marcelo dos Santos,
Letícia Cristina Cidreira Boaro
Publication year - 2020
Publication title -
research, society and development
Language(s) - English
Resource type - Journals
ISSN - 2525-3409
DOI - 10.33448/rsd-v9i11.9401
Subject(s) - antimicrobial , flexural strength , chlorhexidine , montmorillonite , enterococcus faecalis , dentistry , flexural modulus , nuclear chemistry , materials science , chemistry , composite material , medicine , organic chemistry , biochemistry , escherichia coli , gene
this study aimed to evaluate the antimicrobial and physicochemical properties of a commercial endodontic sealer modified by the addition of montmorillonite (MMT) nanoparticles loaded with two different drugs: chlorhexidine (CHX) or metronidazole (MET). Methods: 5 wt% MMT/CHX or MMT/MET nanoparticles were added to the sealer AH-Plus. The experimental materials were evaluated for drug release, antimicrobial activity, flow, flexural strength, and flexural modulus. Data were subjected to one-way ANOVA, Kruskal-Wallis, and Mann-Whitney tests. Results: The drug incorporation into MMT particles was 9% and 10% for CHX and MET, respectively. At 20 days after manipulation, 16.5% of the drug was released by the sealer with MMT/MET and 0.4% by MMT/CHX. The addition of both nanoparticles decreased the flow of materials, but they were still in compliance with ISO 6876-2012. The conversion, flexural strength, and flexural modulus of MMT/MET (87%, 37±7 MPa, 2.3 GPa) and MMT/CHX (78%, 29±2 MPa, 2.7 GPa) were similar in both groups but lower than in the control group (100%, 54±7 MPa, 4.0±0.7 GPa). Both experimental materials were able to form an inhibition halo for E. faecalis bacteria (CHX: 4.8±1.4 and MET: 4.0±1.6 mm), whereas the control group did not inhibit the microorganism. Conclusion: both formulations proposed as endodontic sealer presented effective antimicrobial activity and acceptable flow. The addition of MMT/CHX and MMT/MET particles decreased the conversion and mechanical properties, but further studies are required to clarify the clinical relevance of these properties.