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- W2267222283 abstract "Abstract Aim The aim of this study was to determine the following: (i) the quantity of free chlorine in mixtures of equal proportions of sodium hypochlorite (Na OC l) with trisodium ethylenediaminetetraacetic acid ( EDTAHN a 3 ) and alkaline tetrasodium ethylenediaminetetraacetic acid ( EDTAN a 4 ); (ii) organic matter dissolution; and (iii) the time necessary to remove the smear layer by these irrigants alone and when mixed. Methodology The solutions were mixed in a 1 : 1 ratio and then iodometrically titrated over time to determine the quantity of free available chlorine. The capability of organic matter dissolution by the solutions alone and the mixtures of irrigants was analysed by weighing bovine muscle tissue specimens before and after submission to the following groups ( n = 10): G1 – 0.9% saline solution (control), G2 – 2.5% Na OC l, G3 – 17% EDTAHN a 3 , G4 – 10% EDTAN a 4 , G5 – 20% EDTAN a 4 , G6 – 5% Na OC l + 17% EDTAHN a 3 , G7 – 5% Na OC l + 10% EDTAN a 4 and G8 – 5% Na OC l + 20% EDTAN a 4 . The times necessary for smear layer removal were determinated on discs of bovine dentine with a standardized smear layer produced with SiC papers using a scanning electron microscope that did not require the samples to be sputter coated. The dentine discs were submitted to the same experimental groups previously described ( n = 10) over several time periods, and the photomicrographs acquired were scored for the presence of smear layer. The parametric data of tissue dissolution were analysed using two‐way anova and one‐way anova with Tukey's post hoc tests (α < 0.05), whilst nonparametric data of smear layer removal were analysed by Friedman test (α < 0.05) and the Kruskal–Wallis test with Dunn's post hoc (α < 0.05). Results EDTAHN a 3 caused an almost complete and immediate loss of free available chlorine from Na OC l, whilst EDTAN a 4 promoted a slow and concentrat‐ion‐dependent decline. The organic matter was not dissolved in the control group, EDTA groups or the mixture of Na OC l + 17% EDTAHN a 3 group ( P > 0.05). Na OC l alone and the associations of Na OC l + EDTAN a 4 dissolved tissue at all periods analysed ( P < 0.05). The smear layer was not removed in the control and Na OC l groups ( P > 0.05). The smear layer was removed at 1 min in the Na OC l + 17% EDTAHN a 3 group ( P < 0.05); 2 min in 17% EDTAHN a 3 group ( P < 0.05); and 5 min in 10% EDTAN a 4 , 20% EDTAN a 4 , 5% Na OC l + 10% EDTAN a 4 and 5% Na OC l + 20% EDTAN a 4 groups ( P < 0.05). Conclusions Alkaline EDTAN a 4 was slower in removing the smear layer than EDTAHN a 3 , but when mixed with Na OC l during biomechanical canal preparation promoted organic matter dissolution and smear layer removal simultaneously. However, the mixing of Na OC l and EDTAN a 4 should be performed immediately before use to prevent the reduction of free available chlorine." @default.
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- W2267222283 date "2016-01-06" @default.
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- W2267222283 title "Mixture of alkaline tetrasodium EDTA with sodium hypochlorite promotes<i>in vitro</i>smear layer removal and organic matter dissolution during biomechanical preparation" @default.
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- W2267222283 doi "https://doi.org/10.1111/iej.12595" @default.
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