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Cytotoxicity, interaction with dentine and efficacy on multispecies biofilms of a modified salt solution intended for endodontic disinfection in a new in vitro biofilm model
Author(s) -
Waal S. V.,
Scheres N.,
Soet J. J.,
Wesselink P. R.,
Crielaard W.
Publication year - 2015
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12294
Subject(s) - biofilm , sodium hypochlorite , chlorhexidine , antimicrobial , in vivo , in vitro , microbiology and biotechnology , cytotoxicity , root canal , formazan , enterococcus faecalis , chemistry , dentistry , ex vivo , endodontics , streptococcus mutans , negative control , bacteria , biology , staphylococcus aureus , medicine , biochemistry , traditional medicine , genetics , organic chemistry
Aim To investigate the cytotoxicity of a modified salt solution ( MSS ) and evaluate the antimicrobial properties of MSS on in vitro biofilm models. Methodology In a metabolic assay, fibroblasts derived from periodontal ligaments ( PDL ) of human extracted teeth were cultured and challenged with MSS or controls. Then, in active attachment biofilm models, the efficacy of MSS in the presence of dentine powder and in eliminating mature biofilms was investigated. In the dentine assay, a biofilm of E nterococcus faecalis was employed. For the final assay, microorganisms were retrieved from infected root canals and cultured to produce biofilms. After the treatments with MSS or the controls, the biofilms were collected, serially diluted and plated. The colony‐forming units were counted. One‐way anova was used to analyse the differences between the groups. A P < 0.05 was considered significant. Results The PDL fibroblasts remained metabolically active after challenges with MSS . Dentine powder did not alter the efficacy of MSS ( P > 0.05). In endodontic biofilms, the culturable bacteria were equally reduced by MSS , 2% chlorhexidine ( CHX ) or 2% sodium hypochlorite ( N a OC l) ( P > 0.05). Conclusions Modified salt solution is noncytotoxic in vitro and has good antimicrobial properties equal to CHX and N a OC l. Although the results are promising, ex vivo and in vivo studies are needed before its use as an interappointment root canal dressing can be considered.