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Physicochemical and mechanical properties of zirconium oxide and niobium oxide modified P ortland cement‐based experimental endodontic sealers
Author(s) -
Viapiana R.,
Flumignan D. L.,
GuerreiroTanomaru J. M.,
Camilleri J.,
TanomaruFilho M.
Publication year - 2014
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12167
Subject(s) - radiodensity , materials science , root canal , cement , compressive strength , solubility , portland cement , dental cement , dentistry , composite material , endodontics , universal testing machine , chemistry , medicine , ultimate tensile strength , surgery , radiography , adhesive , organic chemistry , layer (electronics)
Aim To evaluate the physicochemical and mechanical properties of Portland cement‐based experimental sealers (ES) with different radiopacifying agents (zirconium oxide and niobium oxide micro‐ and nanoparticles) in comparison with the following conventional sealers: AH Plus, MTA Fillapex and Sealapex. Methodology The materials were tested for setting time, compressive strength, flow, film thickness, radiopacity, solubility, dimensional stability and formaldehyde release. Data were subjected to anova and Tukey tests ( P < 0.05). Results MTA Fillapex had the shortest setting time and lowest compressive strength values ( P < 0.05) compared with the other materials. The ES had flow values similar to the conventional materials, but higher film thickness ( P < 0.05) and lower radiopacity ( P < 0.05). Similarly to AH Plus, the ES were associated with dimensional expansion ( P > 0.05) and lower solubility when compared with MTA Fillapex and Sealapex ( P < 0.05). None of the endodontic sealers evaluated released formaldehyde after mixing. Conclusion With the exception of radiopacity, the Portland cement‐based experimental endodontic sealers presented physicochemical properties according to the specifications no 57 ANSI/ADA ( ADA Professional Product Review , 2008) and ISO 6876 ( Dentistry — Root Canal Sealing Materials , 2012, British Standards Institution, London, UK). The sealers had setting times and flow ability that was adequate for clinical use, satisfactory compressive strength and low solubility. Additional studies should be carried out with the purpose of decreasing the film thickness and to determine the ideal ratio of radiopacifying agents in Portland cement‐based root canal sealers.