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      Thermal, chemical and physical analysis of VDW.1Seal, Fill Root ST, and ADseal root canal sealers

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          Abstract

          This study aimed to evaluate the thermal, chemical, and physical properties of VDW.1Seal, Fill Root ST, and ADseal sealers. Thermal properties were analyzed using Thermogravimetric analysis (TGA) and Differential thermal analysis (DTA). Attenuated total reflection Fourier Transform Infrared Spectroscopy (ATR-FTIR) analysis was performed as a complementary test to confirm TGA/DTA analysis. The chemical composition of the set sealer material was identified using an X-ray powder diffraction (XRD) system. Other physical properties of each sealer were investigated; ten specimens were used to measure the solubility (at 24 h and 28 days), and another ten specimens were used to assess pH changes and calcium ion release (after 7 and 14 days). Film thickness was done according to ISO 6876 specs. The data were analyzed using the two-way ANOVA test. Results showed that for all sealers, TGA analysis revealed a direct relationship between sealer mass loss and temperature rise. In addition, the decomposition of the tested sealers started at 145 °C, 135 °C and 91 °C for VDW.1Seal, ADseal sealer, and Fill Root ST, respectively. XRD analysis revealed a higher degree of crystallinity for VDW.1Seal and ADseal. ADseal showed the least solubility; VDW.1Seal exhibited the highest alkalinity, calcium ion release, and the lowest film thickness.

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          Alkaline pH homeostasis in bacteria: new insights.

          Etana Padan, Eitan Bibi, Masahiro Ito … (2005)
          The capacity of bacteria to survive and grow at alkaline pH values is of widespread importance in the epidemiology of pathogenic bacteria, in remediation and industrial settings, as well as in marine, plant-associated and extremely alkaline ecological niches. Alkali-tolerance and alkaliphily, in turn, strongly depend upon mechanisms for alkaline pH homeostasis, as shown in pH shift experiments and growth experiments in chemostats at different external pH values. Transcriptome and proteome analyses have recently complemented physiological and genetic studies, revealing numerous adaptations that contribute to alkaline pH homeostasis. These include elevated levels of transporters and enzymes that promote proton capture and retention (e.g., the ATP synthase and monovalent cation/proton antiporters), metabolic changes that lead to increased acid production, and changes in the cell surface layers that contribute to cytoplasmic proton retention. Targeted studies over the past decade have followed up the long-recognized importance of monovalent cations in active pH homeostasis. These studies show the centrality of monovalent cation/proton antiporters in this process while microbial genomics provides information about the constellation of such antiporters in individual strains. A comprehensive phylogenetic analysis of both eukaryotic and prokaryotic genome databases has identified orthologs from bacteria to humans that allow better understanding of the specific functions and physiological roles of the antiporters. Detailed information about the properties of multiple antiporters in individual strains is starting to explain how specific monovalent cation/proton antiporters play dominant roles in alkaline pH homeostasis in cells that have several additional antiporters catalyzing ostensibly similar reactions. New insights into the pH-dependent Na(+)/H(+) antiporter NhaA that plays an important role in Escherichia coli have recently emerged from the determination of the structure of NhaA. This review highlights the approaches, major findings and unresolved problems in alkaline pH homeostasis, focusing on the small number of well-characterized alkali-tolerant and extremely alkaliphilic bacteria.
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            Physical properties of 5 root canal sealers.

            Hui-min Zhou, Ya Shen, Wei-Wei Zheng … (2013)
            The aim of this study was to evaluate the pH change, viscosity and other physical properties of 2 novel root canal sealers (MTA Fillapex and Endosequence BC) in comparison with 2 epoxy resin-based sealers (AH Plus and ThermaSeal), a silicone-based sealer (GuttaFlow), and a zinc oxide-eugenol-based sealer (Pulp Canal Sealer).
            Article 0 comments Cited 129 times – based on 0 reviews     Review now
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              Evaluation of radiopacity, pH, release of calcium ions, and flow of a bioceramic root canal sealer.

              George Táccio de Miranda Candeiro, Fabrícia Correia, Marco Duarte … (2012)
              The aim of the present study was to evaluate the physicochemical properties of a bioceramic root canal sealer, Endosequence BC Sealer. Radiopacity, pH, release of calcium ions (Ca(2+)), and flow were analyzed, and the results were compared with AH Plus cement.
              Article 0 comments Cited 117 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Shehabeldin Saber:
                ORCID: http://orcid.org/0000-0002-1465-3198
                Shehabeldin.saber@bue.edu.eg
                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group UK (London )
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 8 September 2023
                Publication date PMC-release: 8 September 2023
                Publication date Collection: 2023
                Volume: 13
                Electronic Location Identifier: 14829
                Affiliations
                [1 ]GRID grid.440862.c, ISNI 0000 0004 0377 5514, Endodontic Department, Faculty of Dentistry, , The British University in Egypt, ; 81-11-11 El-Rehab, Cairo, 11841 Egypt
                [2 ]GRID grid.440862.c, ISNI 0000 0004 0377 5514, Center for Innovative Dental Sciences, , The British University in Egypt, ; El Sherouk City, Egypt
                [3 ]GRID grid.7269.a, ISNI 0000 0004 0621 1570, Endodontic Department, Faculty of Dentistry, , Ain Shams University, ; Cairo, Egypt
                [4 ]GRID grid.419725.c, ISNI 0000 0001 2151 8157, Restorative and Dental Materials Department, , Oral and Dental Research Institute, National Research Centre (NRC), ; Giza, Dokki 12622 Egypt
                Author information
                http://orcid.org/0000-0002-1465-3198
                Article
                Publisher ID: 41798
                DOI: 10.1038/s41598-023-41798-8
                PMC ID: 10491594
                PubMed ID: 37684307
                SO-VID: 30e83bfa-63b2-4061-bda6-35c9ad0e58c1
                Copyright © © Springer Nature Limited 2023
                License:

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                Date received : 21 March 2023
                Date accepted : 31 August 2023
                Funding
                Funded by: British University in Egypt (BUE)
                Open Access :

                Open access funding provided by The Science, Technology & Innovation Funding Authority (STDF) in cooperation with The Egyptian Knowledge Bank (EKB).

                Categories
                Subject: Article
                Custom metadata
                issue-copyright-statement © Springer Nature Limited 2023

                ScienceOpen disciplines: Uncategorized
                Keywords: dental materials,endodontics
                Data availability:
                ScienceOpen disciplines: Uncategorized
                Keywords: dental materials, endodontics

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