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The recovery effect of proanthocyanidin on microtensile bond strength to sodium hypochlorite‐treated dentine
Author(s) -
Wang Y.,
Chen C.,
Zang H. L.,
Liang Y. H.
Publication year - 2019
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.13005
Subject(s) - bond strength , sodium hypochlorite , molar , dentistry , dentin , materials science , smear layer , chemistry , adhesive , composite material , medicine , layer (electronics) , organic chemistry
Abstract Aim To evaluate the recovery effect of proanthocyanidin ( PA ) on microtensile bond strength (μ TBS ) to sodium hypochlorite (Na OC l)‐treated dentine. Methodology Fifty‐five freshly extracted third molars with intact dental crowns, no caries or restorations were sectioned to expose a sound middle layer of dentine and were randomly divided into 11 groups. In the blank control group, dentine surfaces were immersed in deionized water for 20 min. In the negative control group, dental surfaces were immersed in 5.25% Na OC l for 20 min. In the other nine experimental groups, after immersion for 20 min in 5.25% Na OC l, followed by PA (5%, 10%, or 15%) treatment for 1, 5 min or 10 min. The Na OC l solution was renewed every 5 min. Then dentine surfaces were bonded using SE bond. Bonded samples were sectioned into dentine‐resin sticks ( n = 45) for microtensile bond strength testing ( MP a). Failure modes were observed and classified into three types with a stereomicroscope. Microtensile bond strength data were analysed using one‐way anova . The confidence interval test was performed to analyse the recovery effect of PA on bond strength to Na OC l‐treated dentine. The chi‐squared test was used to analyse failure mode distribution. Results After use of 5.25% Na OC l for 20 min, microtensile bond strength in the negative control group decreased significantly compared with that of the untreated group ( P < 0.05). After a recovery treatment of 10% PA for 10 min or 15% PA for more than 5 min, the bond strength was restored to at least 90% of baseline ( P < 0.05). No recovery effect on bond strength was detected after the application of 5% PA for 1 min ( P > 0.05). Adhesive fracture was found to be the most common failure mode in the Na OC l‐treated group. After the recovery application of PA , the proportion of mixed failures increased significantly ( P < 0.05). Conclusions Microtensile bond strength to Na OC l‐treated dentine recovered after the application of either 5% PA for more than 5 min or 10% or 15% PA for more than 1 min. The application of PA before an adhesive procedure may immediately restore the compromised bond strength of Na OC l‐treated dentine.