Physicochemical properties of methacrylate resin-based root canal sealers.
BACKGROUND
This study assessed in vitro the physicochemical properties of 2 methacrylate resin-based sealers (Epiphany SE and Hybrid Root SEAL), comparing the results with a well-established epoxy resin-based sealer (AH Plus).


METHODS
Five samples of each material were used for each test (setting time, flow, radiopacity, dimensional change after setting, and solubility) according to American National Standards Institute/American Dental Association (ANSI/ADA) Specification 57. The samples were assigned to 3 groups: I, AH Plus; II, Epiphany SE; and III, Hybrid Root SEAL. The distilled and deionized water used at the solubility test was submitted to atomic absorption spectrometry to observe the presence of Ca2+, K+, Ni2+, and Zn2+ ions. In addition, the surface morphology of the specimens was analyzed by means of scanning electron microscopy (SEM). Statistical analysis was performed by using one-way analysis of variance and Tukey-Kramer test (P < .05).


RESULTS
Flow, radiopacity, and solubility of all sealers were in accordance with ANSI/ADA. The setting time of Hybrid Root SEAL did not agree with ANSI/ADA requirements. The dimensional change of all sealers was greater than the values considered acceptable by ANSI/ADA. The spectrometry analysis showed significant Ca(2+) ions release for AH Plus. In SEM analysis, Hybrid Root SEAL presented spherical monomers with inferior size than AH Plus and Epiphany SE.


CONCLUSIONS
It might be concluded that physicochemical properties of the tested sealers conformed to ANSI/ADA (2000) standardization, except for the setting time of Hybrid Root SEAL and the dimensional change of all sealers, which did not fulfill the ANSI/ADA requirements.
Marin-Bauza
Gabriela Alessandra
GA
School of Dentistry, University of Ribeirão Preto, Ribeirão Preto, São Paulo, Brazil.
Rached-Junior
Fuad Jacob Abi
FJ
Souza-Gabriel
Aline Evangelista
AE
Sousa-Neto
Manoel Damião
MD
Miranda
Carlos Eduardo Saraiva
CE
Silva-Sousa
Yara Teresinha Correa
YT
D055598:Chemical Phenomena; D004853:Epoxy Resins / Q000737:chemistry* / Q000592:standards; D006244:Hardness; D008689:Methacrylates / Q000737:chemistry* / Q000592:standards; D011861:Radiography, Dental; D012212:Rheology; D012387:Root Canal Filling Materials / Q000737:chemistry* / Q000528:radiation effects / Q000592:standards; D013499:Surface Properties; D013997:Time Factors
D004853:Epoxy Resins; D008689:Methacrylates; D012387:Root Canal Filling Materials; C486893:epiphany sealer; C534916:epoxy resin-based root canal sealer; C534239:metaseal