Do Contaminating Substances Influence the Rheological Properties of Root Canal Sealers?

de Freitas JV, Ebert J, Mazzi-Chaves JF, de Sousa-Neto MD, Lohbauer U, Baratto-Filho F (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Journal of Endodontics Elsevier

DOI: 10.1016/j.joen.2019.10.030

Abstract

Introduction: This study evaluated the effect of residual substances derived from irrigant solutions and intracanal medications on the rheological properties of a silicone, gutta-percha, and bioactive glass–based sealer in comparison with an epoxy resin–based sealer. Methods: Thin films of contaminants (0.5 μL) (3% sodium hypochlorite [NaOCl], chlorhexidine digluconate [CHX], 17% EDTA, calcium hydroxide, 40% citric acid, or distilled water [DW]) were applied along with freshly mixed GuttaFlow Bioseal (GFB; Coltene/Whaledent, Langenau, Germany) or AH Plus Jet (Dentsply DeTrey, Konstanz, Germany) on the lower plate of a dynamic rheometer. Rheological measurements were performed in oscillating mode at the strain amplitude, angular frequency, and constant temperature of 0.01%, 10 rad/s, and 37°C, respectively. Samples without contaminants served as controls. All measurements were performed 5 times. The Kolmogorov-Smirnov test and 1-way analysis of variance followed by the Student-Newman-Keuls test were performed to analyze the results (P < .05). Results: The contaminants did not alter the setting time of GFB compared with the controls; however, CHX and calcium hydroxide decreased its complex viscosity (ƞ*) (P < .05). The setting time of AH Plus Jet was increased by DW, CHX, citric acid, and EDTA (P < .05). All contaminants decreased its ƞ* at the setting point (P < .05). NaOCl led to the greatest alteration of its rheological parameters. Conclusions: Irrigant solutions and intracanal medications adversely affected at least 1 of the tested rheological properties of both sealers, except for DW and 3% NaOCl, which did not alter any rheological property of GFB.

Authors with CRIS profile

Johannes Ebert Department of Operative Dentistry and Periodontology Ulrich Lohbauer Medizinische Fakultät

Involved external institutions

Universidade Positivo (UP) BR Brazil (BR) University of São Paulo / Universidade de São Paulo (USP) BR Brazil (BR)

How to cite

APA:

de Freitas, J.V., Ebert, J., Mazzi-Chaves, J.F., de Sousa-Neto, M.D., Lohbauer, U., & Baratto-Filho, F. (2019). Do Contaminating Substances Influence the Rheological Properties of Root Canal Sealers? Journal of Endodontics. https://doi.org/10.1016/j.joen.2019.10.030

MLA:

de Freitas, Jéssica Vavassori, et al. "Do Contaminating Substances Influence the Rheological Properties of Root Canal Sealers?" Journal of Endodontics (2019).

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