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Effects of heat in the properties of NaOCl alone and mixed with etidronate and alkaline tetrasodium EDTA.

Abstract：

AIM:To assess the free available chlorine concentration (FAC), organic tissue dissolution, and smear layer removal capacity of sodium hypochlorite (NaOCl) alone and when mixtured with etidronate (HEDP) and tetrasodium EDTA (Na4 EDTA), and heated to different temperatures. METHODOLOGY:Mixtures at 1:1 ratio of 5% NaOCl with distilled water (considered NaOCl alone), 18% HEDP or 10% Na4 EDTA were heated to 25 °C, 37 °C, 48 °C, and 60 °C. The FAC in the mixtures was assessed at 5, 10, 20, 30, 60, and 120 min. Samples of bovine muscle tissue (n=10) were prepared with similar size and weighed before and after 5, 10, and 15 min of immersion in the mixtures heated to the different temperatures to verify organic matter dissolution. The intergroup results were statistically compared by one-way analysis of variance (ANOVA) and intragroup by two-way analysis of variance (ANOVA), both followed by Tukey's multiple-comparison test (α < 0.01). Bovine dentine blocks (n=10) were analyzed by scanning electron microscopy before and after immersion in the mixtures and the time taken to remove the smear layer from the samples surface was determined. Friedman test was used to compare the scores of the same group (α < 0.01), and the Kruskal-Wallis test with Dunn's post-hoc was used to compare the different groups (α < 0.01). Saline solution was used as a control in the experiments of tissue dissolution and smear layer removal, RESULTS: Heating NaOCl alone did not affect its FAC. The higher the temperature of the mixtures with the chelators the lower the FAC. Organic tissue dissolution was improved by increases in temperature of NaOCl alone and its mixture with HEDP (P < 0.01); however, the mixture with Na4 EDTA had no improvement (P > 0.01). Smear layer removal by NaOCl alone was enhanced by heating resulting in lower score in some samples and became more rapid in the mixtures with the chelators. The saline solution did not promote tissue dissolution nor smear layer removal (P > 0.01). CONCLUSION:In this laboratory study, heating NaOCl alone or when mixed with HEDP improved its capacity to dissolve organic matter and remove the smear layer. However, the mixture with HEDP required frequent refreshment to retain these effects when heated. Due to acceleration in the reaction between the irrigants, very rapid reductions in the free available chlorine in the mixtures with Na4 EDTA heated to the different temperatures occurred.

journal_name

Int Endod J

journal_title

International endodontic journal

authors

Tartari T,Borges MMB,de Araújo LBB,Vivan RR,Bonjardin LR,Duarte MAH

doi

10.1111/iej.13450

subject

Has Abstract

pub_date

2020-11-20 00:00:00

eissn

0143-2885

issn

1365-2591

pub_type

杂志文章

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Effects of heat in the properties of NaOCl alone and mixed with etidronate and alkaline tetrasodium EDTA.