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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Heating stability, physical and chemical analysis of calcium silicate-based endodontic sealers

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Author(s):
Antunes, T. B. M. [1] ; Janini, A. C. P. [1] ; Pelepenko, L. E. [1] ; Abuna, G. F. [1] ; Paiva, E. M. [2] ; Sinhoreti, M. A. C. [1] ; Raimundo, Jr., I. M. [2] ; Gomes, B. P. F. A. [1] ; de-Jesus-Soares, A. [1] ; Marciano, M. A. [1]
Total Authors: 10
Affiliation:
[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP - Brazil
[2] Univ Estadual Campinas, Inst Chem, Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: International Endodontic Journal; v. 54, n. 7 MAR 2021.
Web of Science Citations: 0
Abstract

Aim To evaluate possible modifications in root canal sealers subjected to a variety of heating conditions using vibrational spectroscopy and analysis of physical and chemical properties. Methodology EndoSequence BC Sealer HiFlow, Bio-C Sealer, BioRoot RCS and AH Plus were analysed chemically using Raman spectroscopy (25-220 degrees C) and Fourier-transform infrared spectroscopy (FT-IR) (37-100 degrees C ). For FT-IR, the materials were tested individually and mixed with root dentine powder. Scanning electron microscopy (SEM) and coupled energy dispersive spectroscopy (EDS) were used to evaluate surface and chemical elements. ISO 6876-2012 and ASTM-C266-07 specifications were followed to evaluate flow, setting time (moist and dry), solubility and radiopacity. Also, pH analysis at 37 and 100 degrees C was performed. Shapiro-Wilk and Mixed ANOVA (within and between the effects of the subjects), Levene, and a post hoc analyses with Bonferroni correction were performed (P < 0.05). Results Vibrational spectroscopy revealed peaks of tricalcium silicate, dicalcium silicate and zirconium dioxide. Chemical changes in the Raman spectra during heating were discrete, as the inorganic content predominated the signalling for all root canal sealers. FT-IR analysis exhibited spectral changes in water absorption for EndoSequence BC Sealer HiFlow and Bio-C Sealer, probably related to dehydration. For BioRoot RCS and AH Plus, no significant chemical changes were observed. Bio-C Sealer exhibited a band of polyethylene glycol only after heating to 100 degrees C, probably related to its thermal decomposition. SEM/EDS analysis corroborated the composition results observed in vibrational spectroscopy for all materials. Heating to 100 degrees C significantly changed the flowability of all calcium silicate-based sealers with a wide variation in setting times at both temperatures, along with solubility levels above ISO standards. For all tested sealers, radiopacity fulfilled the requirements, and pH exhibited alkaline values. Conclusions The tested calcium silicate-based sealers were affected by heating. Calcium silicate-based root canal sealers had high solubility which is a concern for their clinical use. AH Plus was the only root canal sealer that was stable after heating. (AU)

FAPESP's process: 19/22098-9 - In vivo analysis of local and systemic migration of ions from ProRoot MTA and tricalcium silicate
Grantee:Marina Angélica Marciano da Silva
Support Opportunities: Regular Research Grants
FAPESP's process: 14/50951-4 - INCT 2014: Advanced Analytical Technologies
Grantee:Celio Pasquini
Support Opportunities: Research Projects - Thematic Grants