The addition of Nb(2) O(5) increases radio-opacity and microhardness; this material may be a promising filler for the production of a new endodontic sealer.
ObjectiveTo verify the influence of radiopaque fillers on an epoxy resin-based sealer. Material and MethodsExperimental 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. ResultsThe 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. ConclusionThe inorganic fillers evaluated and their concentrations affect the
physicochemical properties of an epoxy resin-based root canal sealer.
The purpose of this study was to evaluate the water sorption, solubility, pH and ability to diffuse into dentin of a glycerol salicylate-based, pulp-capping cement in comparison to a conventional calcium hydroxide-based pulp capping material (Hydcal). An experimental cement was developed containing 60% glycerol salicylate resin, 10% methyl salicylate, 25% calcium hydroxide and 5% Portland cement. Water sorption and solubility were determined based on mass changes in the samples before and after the immersion in distilled water for 7 days. Material discs were stored in distilled water for 24 h, 7 days and 28 days, and a digital pHmeter was used to measure the pH of water. The cement's ability to diffuse into bovine dentin was assessed by Raman spectroscopy. The glycerol salicylate-based cement presented higher water sorption and lower solubility than Hydcal. The pH of water used to store the samples increased for both cements, reaching 12.59 ± 0.06 and 12.54 ± 0.05 after 7 days, for Hydcal and glycerol salicylate-based cements, respectively. Both cements were able to turn alkaline the medium at 24 h and sustain its alkalinity after 28 days. Hydcal exhibited an intense diffusion into dentin up to 40 µm deep, and the glycerol salicylate-based cement penetrated 20 µm. The experimental glycerol salicylate-based cement presents good sorption, solubility, ability to alkalize the surrounding tissues and diffusion into dentin to be used as pulp capping material.
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