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. 2015 May-Jun;18(3):227-31.
doi: 10.4103/0972-0707.157259.

Physical-mechanical properties of Bis-EMA based root canal sealer with different fillers addition

Marcela Oliveira de Souza  1 , Vicente Castelo Branco Leitune  1 , Priscila Veit Bohn  1 , Susana Maria Werner Samuel  1 , Fabrício Mezzomo Collares  1
Affiliations

Physical-mechanical properties of Bis-EMA based root canal sealer with different fillers addition

Marcela Oliveira de Souza et al. J Conserv Dent. 2015 May-Jun.

Abstract

Aim: To evaluate influence of three different filler particles on an experimental Bisphenol A ethoxylated dimethacrylate (Bis-EMA) based root filling material.

Materials and methods: Resin-based endodontic sealers were produced using Bis-EMA, camphorquinone, ethyl 4-dimethylaminobenzoate (EDAB), N, N-dihydroxyethyl-p-toluidine (DHEPT), butylated hydroxytoluene (BHT), and benzoyl peroxide. The experimental groups were formulated adding 10, 20, 30, 40, and 50% of calcium tungstate (CaWO4), ytterbium trifluoride(YbF3), and tantalum oxide(Ta2O5). Flow, thickness, and radiopacity tests were conducted in accordance with ISO 6876. Sorption and solubility (SL) tests were conducted in accordance with ISO 4049, pH was measured with a pH meter, and degree of conversion (DC) was evaluated with Fourier transform infrared spectroscopy (FTIR). For radiopacity, two-way analysis of variance (ANOVA) and Tukey's multiple comparison test was performed. For DC analysis, one-way ANOVA and Tukey's multiple comparison test was performed. All statistical analyses were performed with a significance level of 5%.

Results: All groups showed lower flow with increased filler concentration. All groups showed film thickness values lower than 50μm, as ISO recommends, except CaWO450% group (76.7μm). pH values varied from 5.95 (± 0.07) in YbF340% group to 6.90 (± 0.07) in Ta2O540% group. In the radiopacity test, YbF330%, Ta2O540%, and Ta2O550% groups showed no statistical significant difference to 3mmAl. Ta2O5 and YbF3 groups in 10, 20, and 30% concentrations presented sorption and SL values as ISOrecommendation. Addition ofTa2O5 and CaWO4 decreased DC after 14 days. YbF3 addition showed no difference in DC from control group.

Conclusion: YbF3 filler addition promoted higher properties compared to CaWO4 and Ta2O5 on Bis-EMA based root canal sealer.

Keywords: Ethoxylated bisphenol-A-dimethacrylate; root canals sealer; ytterbium trifluoride.

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Conflict of interest statement

Conflict of Interest: None declared.

Figures

Figure 1
Figure 1
Means and standard deviations of radiopacity values, in pixels, of experimental sealers. Columns marked with *represent no significant differences to 2-mmAl. Columns marked with # represent no significant differences to 3-mmAl. P > 0.05
Figure 2
Figure 2
Means and standard deviations of degree of conversion after 14 days of experimental sealers. Bars connected by the line showed no significant difference to control group. P > 0.05
See this image and copyright information in PMC

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