Influence of radiopaque fillers on physicochemical properties of a model epoxy resin-based root canal sealer.
OBJECTIVE
To verify the influence of radiopaque fillers on an epoxy resin-based sealer.


METHODS
Experimental sealers were formulated by adding 20%, 40%, 60%, 80%, 100% and 120% of calcium tungstate, ytterbium trifluoride or barium sulphate by weight to an epoxy-resin-base. Setting time, flow, film thickness, radiopacity, sorption, solubility, pH and push-out bond strength were evaluated.


RESULTS
The setting time ranged from 373 to 612.66 min, the flow varied from 13.81±0.49 to 22.49±0.37 mm, and the film thickness ranged from 16.67±5.77 to 33.33±11.54 µm. The lowest pH was 5.47±0.53, and the highest was 6.99±0.03. Radiopacity varied from 0.38±0.04 to 2.57±0.21 mmAl and increased with the amount of filler. Calcium tungstate sealers had a higher sorption and solubility than other sealers. There was no significant difference in the push-out bond strength among the fillers at the 120% concentration.


CONCLUSIONS
The inorganic fillers evaluated and their concentrations affect the physicochemical properties of an epoxy resin-based root canal sealer.
Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Conservative Dentistry, Dental Materials Laboratory, Porto AlegreRS, Brazil.
Fabrício Mezzomo
FM
Collares
Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Conservative Dentistry, Dental Materials Laboratory, Porto AlegreRS, Brazil.
Mariana
M
Klein
Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Conservative Dentistry, Dental Materials Laboratory, Porto AlegreRS, Brazil.
Paula Dapper
PD
Santos
Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Conservative Dentistry, Dental Materials Laboratory, Porto AlegreRS, Brazil.
Fernando Freitas
FF
Portella
Universidade Federal de Pelotas, School of Materials Engineering, PelotasRS, Brazil.
Fabrício
F
Ogliari
Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Conservative Dentistry, Dental Materials Laboratory, Porto AlegreRS, Brazil.
Vicente Castelo Branco
VC
Leitune
Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Conservative Dentistry, Dental Materials Laboratory, Porto AlegreRS, Brazil.
Susana Maria Werner
SM
Samuel
D000704:Analysis of Variance; D001466:Barium Sulfate / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry; D003287:Contrast Media / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D004853:Epoxy Resins / Q000737:chemistry*; D008422:Materials Testing; D010316:Particle Size; D012016:Reference Values; D015203:Reproducibility of Results; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012995:Solubility; D018709:Statistics, Nonparametric; D013499:Surface Properties; D017973:Tungsten Compounds / Q000737:chemistry; D015018:Ytterbium / Q000737:chemistry
D017610:Calcium Compounds; D003287:Contrast Media; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D017973:Tungsten Compounds; C534916:epoxy resin-based root canal sealer; D001466:Barium Sulfate; C018858:calcium tungstate; D015018:Ytterbium