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

Szczegóły
Abstrakt

Tytuł:: Effects of heat in the properties of NaOCl alone and mixed with etidronate and alkaline tetrasodium EDTA.
Autorzy:: Tartari T; Department of Operative Dentistry, Endodontics, and Dental Materials, University of São Paulo, Bauru, Brazil.
Borges MMB; Department of Operative Dentistry, Endodontics, and Dental Materials, University of São Paulo, Bauru, Brazil.
de Araújo LBB; Department of Operative Dentistry, Endodontics, and Dental Materials, University of São Paulo, Bauru, Brazil.
Vivan RR; Department of Operative Dentistry, Endodontics, and Dental Materials, University of São Paulo, Bauru, Brazil.
Bonjardim LR; Department of Biological Science, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil.
Duarte MAH; Department of Operative Dentistry, Endodontics, and Dental Materials, University of São Paulo, Bauru, Brazil.
Źródło:: International endodontic journal [Int Endod J] 2021 Apr; Vol. 54 (4), pp. 616-627.
Typ publikacji:: Journal Article
Język:: English
Imprint Name(s):: Original Publication: Oxford, Blackwell Scientific Publications.
MeSH Terms:: Etidronic Acid*/pharmacology
Smear Layer*
Animals ; Cattle ; Dental Pulp Cavity ; Dentin ; Edetic Acid/pharmacology ; Hot Temperature ; Microscopy, Electron, Scanning ; Root Canal Irrigants ; Root Canal Preparation ; Sodium Hypochlorite/pharmacology
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Grant Information:: 2017/22364-5 Fundação de Amparo à Pesquisa do Estado de São Paulo; 2018/12690-5 Fundação de Amparo à Pesquisa do Estado de São Paulo
Contributed Indexing:: Keywords: chelation; irrigation solutions; smear layer; sodium hypochlorite; temperature; tissue dissolution
Substance Nomenclature:: 0 (Root Canal Irrigants)
9G34HU7RV0 (Edetic Acid)
DY38VHM5OD (Sodium Hypochlorite)
M2F465ROXU (Etidronic Acid)
Entry Date(s):: Date Created: 20201121 Date Completed: 20210317 Latest Revision: 20210317
Update Code:: 20240105
DOI:: 10.1111/iej.13450
PMID:: 33219520
: Czasopismo naukowe

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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 (Na 4 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% Na 4 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 compared statistically using 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 analysed by scanning electron microscopy before and after immersion in the mixtures, and the time taken to remove the smear layer from the surfaces of the samples was determined. The 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 Na 4 EDTA had no improvement (P > 0.01). Smear layer removal by NaOCl alone was enhanced by heating resulting in lower scores 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 the acceleration in the reaction between the irrigants, very rapid reductions in the free available chlorine in the mixtures with Na 4 EDTA heated to the different temperatures occurred.
(© 2020 International Endodontic Journal. Published by John Wiley & Sons Ltd.)

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