Antimicrobial Effect of Peptide DJK-5 Used Alone or Mixed with EDTA on Mono- and Multispecies Biofilms in Dentin Canals

Dan Wang, Ya Shen, Robert Hancock, Jingzhi Ma, Markus Haapasalo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Introduction: The present study aimed to evaluate the antibacterial effect of a new peptide, DJK-5, used alone or mixed together with EDTA on mono- and multispecies biofilms in dentin canals covered by a smear layer with or without preceding sodium hypochlorite (NaOCl) irrigation. Methods: One hundred twelve dentin blocks (224 final specimens) were prepared and divided into 56 groups, and Enterococcus faecalis or multispecies bacteria were introduced into dentinal tubules by centrifugation. After 1 week of cultivation, a uniform smear layer was created on the surface of the dentin blocks, and the samples were exposed to sterile water, 17% EDTA, 2% or 6% NaOCl, 10 μg/mL DJK-5, or a mixture of 8.5% EDTA +10 μg/mL DJK-5 or were combined treated with the solution in the following sequence: 2% or 6% NaOCl +10 μg/mL DJK-5, 2% or 6% NaOCl + 8.5% EDTA +10 μg/mL DJK-5, 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5. Specimens without a smear layer treated by 6% NaOCl or 10 μg/mL DJK-5 served as the positive control. The irrigant exposure time was 3 or 10 minutes. The antibacterial efficacy was determined by live/dead staining and confocal laser scanning microscopy. Results: The smear layer reduced the antibacterial capacity of 6% NaOCl and 10 μg/mL DJK-5. The efficacy of 2% or 6% NaOCl followed by 10 μg/mL DJK-5 was superior to 10 μg/mL DJK-5 alone (P <.05) but inferior to 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5 and 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5 (P <.05). The mixture of 8.5% EDTA and 10 μg/mL DJK-5 had the same disinfection effectiveness as 10 μg/mL DJK-5 used alone (P <.05). Using 2% or 6% NaOCl before EDTA + peptide always resulted in the highest killing (P <.05). Conclusions: The smear layer inhibits the disinfectant effect in dentin. Peptide DJK-5 showed a strong antibacterial effect against mono- and multispecies biofilms in dentin canals. The highest killing was measured when 6% NaOCl was followed by a mixture of EDTA and peptide DJK-5.

LanguageEnglish
Pages1709-1713
Number of pages5
JournalJournal of Endodontics
Volume44
Issue number11
DOIs
Publication statusPublished - 1 Nov 2018
Externally publishedYes

Keywords

  • Antimicrobial
  • biofilm
  • confocal laser scanning microscopy
  • dentin
  • DJK-5
  • EDTA
  • smear layer

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Wang, Dan ; Shen, Ya ; Hancock, Robert ; Ma, Jingzhi ; Haapasalo, Markus. / Antimicrobial Effect of Peptide DJK-5 Used Alone or Mixed with EDTA on Mono- and Multispecies Biofilms in Dentin Canals. In: Journal of Endodontics. 2018 ; Vol. 44, No. 11. pp. 1709-1713.
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title = "Antimicrobial Effect of Peptide DJK-5 Used Alone or Mixed with EDTA on Mono- and Multispecies Biofilms in Dentin Canals",
abstract = "Introduction: The present study aimed to evaluate the antibacterial effect of a new peptide, DJK-5, used alone or mixed together with EDTA on mono- and multispecies biofilms in dentin canals covered by a smear layer with or without preceding sodium hypochlorite (NaOCl) irrigation. Methods: One hundred twelve dentin blocks (224 final specimens) were prepared and divided into 56 groups, and Enterococcus faecalis or multispecies bacteria were introduced into dentinal tubules by centrifugation. After 1 week of cultivation, a uniform smear layer was created on the surface of the dentin blocks, and the samples were exposed to sterile water, 17{\%} EDTA, 2{\%} or 6{\%} NaOCl, 10 μg/mL DJK-5, or a mixture of 8.5{\%} EDTA +10 μg/mL DJK-5 or were combined treated with the solution in the following sequence: 2{\%} or 6{\%} NaOCl +10 μg/mL DJK-5, 2{\%} or 6{\%} NaOCl + 8.5{\%} EDTA +10 μg/mL DJK-5, 2{\%} or 6{\%} NaOCl + 8.5{\%} EDTA + 10 μg/mL DJK-5. Specimens without a smear layer treated by 6{\%} NaOCl or 10 μg/mL DJK-5 served as the positive control. The irrigant exposure time was 3 or 10 minutes. The antibacterial efficacy was determined by live/dead staining and confocal laser scanning microscopy. Results: The smear layer reduced the antibacterial capacity of 6{\%} NaOCl and 10 μg/mL DJK-5. The efficacy of 2{\%} or 6{\%} NaOCl followed by 10 μg/mL DJK-5 was superior to 10 μg/mL DJK-5 alone (P <.05) but inferior to 2{\%} or 6{\%} NaOCl + 8.5{\%} EDTA + 10 μg/mL DJK-5 and 2{\%} or 6{\%} NaOCl + 8.5{\%} EDTA + 10 μg/mL DJK-5 (P <.05). The mixture of 8.5{\%} EDTA and 10 μg/mL DJK-5 had the same disinfection effectiveness as 10 μg/mL DJK-5 used alone (P <.05). Using 2{\%} or 6{\%} NaOCl before EDTA + peptide always resulted in the highest killing (P <.05). Conclusions: The smear layer inhibits the disinfectant effect in dentin. Peptide DJK-5 showed a strong antibacterial effect against mono- and multispecies biofilms in dentin canals. The highest killing was measured when 6{\%} NaOCl was followed by a mixture of EDTA and peptide DJK-5.",
keywords = "Antimicrobial, biofilm, confocal laser scanning microscopy, dentin, DJK-5, EDTA, smear layer",
author = "Dan Wang and Ya Shen and Robert Hancock and Jingzhi Ma and Markus Haapasalo",
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Antimicrobial Effect of Peptide DJK-5 Used Alone or Mixed with EDTA on Mono- and Multispecies Biofilms in Dentin Canals. / Wang, Dan; Shen, Ya; Hancock, Robert; Ma, Jingzhi; Haapasalo, Markus.

In: Journal of Endodontics, Vol. 44, No. 11, 01.11.2018, p. 1709-1713.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Antimicrobial Effect of Peptide DJK-5 Used Alone or Mixed with EDTA on Mono- and Multispecies Biofilms in Dentin Canals

AU - Wang, Dan

AU - Shen, Ya

AU - Hancock, Robert

AU - Ma, Jingzhi

AU - Haapasalo, Markus

PY - 2018/11/1

Y1 - 2018/11/1

N2 - Introduction: The present study aimed to evaluate the antibacterial effect of a new peptide, DJK-5, used alone or mixed together with EDTA on mono- and multispecies biofilms in dentin canals covered by a smear layer with or without preceding sodium hypochlorite (NaOCl) irrigation. Methods: One hundred twelve dentin blocks (224 final specimens) were prepared and divided into 56 groups, and Enterococcus faecalis or multispecies bacteria were introduced into dentinal tubules by centrifugation. After 1 week of cultivation, a uniform smear layer was created on the surface of the dentin blocks, and the samples were exposed to sterile water, 17% EDTA, 2% or 6% NaOCl, 10 μg/mL DJK-5, or a mixture of 8.5% EDTA +10 μg/mL DJK-5 or were combined treated with the solution in the following sequence: 2% or 6% NaOCl +10 μg/mL DJK-5, 2% or 6% NaOCl + 8.5% EDTA +10 μg/mL DJK-5, 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5. Specimens without a smear layer treated by 6% NaOCl or 10 μg/mL DJK-5 served as the positive control. The irrigant exposure time was 3 or 10 minutes. The antibacterial efficacy was determined by live/dead staining and confocal laser scanning microscopy. Results: The smear layer reduced the antibacterial capacity of 6% NaOCl and 10 μg/mL DJK-5. The efficacy of 2% or 6% NaOCl followed by 10 μg/mL DJK-5 was superior to 10 μg/mL DJK-5 alone (P <.05) but inferior to 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5 and 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5 (P <.05). The mixture of 8.5% EDTA and 10 μg/mL DJK-5 had the same disinfection effectiveness as 10 μg/mL DJK-5 used alone (P <.05). Using 2% or 6% NaOCl before EDTA + peptide always resulted in the highest killing (P <.05). Conclusions: The smear layer inhibits the disinfectant effect in dentin. Peptide DJK-5 showed a strong antibacterial effect against mono- and multispecies biofilms in dentin canals. The highest killing was measured when 6% NaOCl was followed by a mixture of EDTA and peptide DJK-5.

AB - Introduction: The present study aimed to evaluate the antibacterial effect of a new peptide, DJK-5, used alone or mixed together with EDTA on mono- and multispecies biofilms in dentin canals covered by a smear layer with or without preceding sodium hypochlorite (NaOCl) irrigation. Methods: One hundred twelve dentin blocks (224 final specimens) were prepared and divided into 56 groups, and Enterococcus faecalis or multispecies bacteria were introduced into dentinal tubules by centrifugation. After 1 week of cultivation, a uniform smear layer was created on the surface of the dentin blocks, and the samples were exposed to sterile water, 17% EDTA, 2% or 6% NaOCl, 10 μg/mL DJK-5, or a mixture of 8.5% EDTA +10 μg/mL DJK-5 or were combined treated with the solution in the following sequence: 2% or 6% NaOCl +10 μg/mL DJK-5, 2% or 6% NaOCl + 8.5% EDTA +10 μg/mL DJK-5, 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5. Specimens without a smear layer treated by 6% NaOCl or 10 μg/mL DJK-5 served as the positive control. The irrigant exposure time was 3 or 10 minutes. The antibacterial efficacy was determined by live/dead staining and confocal laser scanning microscopy. Results: The smear layer reduced the antibacterial capacity of 6% NaOCl and 10 μg/mL DJK-5. The efficacy of 2% or 6% NaOCl followed by 10 μg/mL DJK-5 was superior to 10 μg/mL DJK-5 alone (P <.05) but inferior to 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5 and 2% or 6% NaOCl + 8.5% EDTA + 10 μg/mL DJK-5 (P <.05). The mixture of 8.5% EDTA and 10 μg/mL DJK-5 had the same disinfection effectiveness as 10 μg/mL DJK-5 used alone (P <.05). Using 2% or 6% NaOCl before EDTA + peptide always resulted in the highest killing (P <.05). Conclusions: The smear layer inhibits the disinfectant effect in dentin. Peptide DJK-5 showed a strong antibacterial effect against mono- and multispecies biofilms in dentin canals. The highest killing was measured when 6% NaOCl was followed by a mixture of EDTA and peptide DJK-5.

KW - Antimicrobial

KW - biofilm

KW - confocal laser scanning microscopy

KW - dentin

KW - DJK-5

KW - EDTA

KW - smear layer

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DO - 10.1016/j.joen.2018.07.018

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EP - 1713

JO - Journal of Endodontics

T2 - Journal of Endodontics

JF - Journal of Endodontics

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