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Effect of 2% chlorhexidine digluconate on bond strength of a glass‐fibre post to root dentine
Author(s) -
Wang L.,
Pinto T. A.,
Silva L. M.,
Araújo D. F. G.,
Martins L. M.,
Hannas A. R.,
Pedreira A. P. R. V.,
Francisconi P. A. S.,
Honório H. M.
Publication year - 2013
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.12070
Subject(s) - bond strength , chlorhexidine , adhesive , dentistry , materials science , dental bonding , composite material , medicine , layer (electronics)
Aim To assess the immediate influence of dentine bonding systems ( DBS ) associated with 2% chlorhexidine digluconate ( CHX ) on glass‐fibre post‐bond strength to root dentine, in terms of coronal, middle and apical thirds. Methodology Sixty bovine roots were root filled and randomly assigned to 1 of 6 groups ( n = 10): SBMP (3‐step etch‐and‐rinse system, Scotchbond Multi‐Purpose), SB (2‐step etch‐and‐rinse system, Single Bond 2), SE (2‐step self‐etching system, Clearfil SE Bond) and SBMP ‐ CHX , SB ‐ CHX and SE ‐ CHX , respectively, associated with CHX . For all groups, a glass‐fibre post was luted with a dual‐cure resin cement, RelyX ARC . After 7‐day storage, specimens were subjected to the push‐out test. Failure modes were analysed under optical microscopy (40x). Bond strength values were statistically analysed by two‐way anova and Bonferroni tests ( P < 0.05). Results The effect of DBS was significant ( P < 0.05), and SE reached higher bond strength in comparison with the other DBS tested. CHX association did not show improvement with any DBS ( P > 0.05); rather, it negatively affected SE , which was detected for all thirds. There was no difference between thirds ( P > 0.05), except for the SE ‐ CHX , which presented lower values for the apical third ( P < 0.05). Adhesive cement/dentine adhesive failure was predominant for all groups. CHX did not influence the failure mode for any DBS ( P > 0.05). Conclusions The performance of the dentine bonding systems was material dependent. CHX did not improve immediate bond strength; however, CHX negatively affected the bond strength of the self‐etching system, especially in the third apical.