title: Physical-mechanical properties of Bis-EMA based root canal sealer with different fillers addition.
abstract: OBJECTIVE
  To evaluate influence of three different filler particles on an experimental Bisphenol A ethoxylated dimethacrylate (Bis-EMA) based root filling material.
  
  
  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.
  
  
  CONCLUSIONS
  YbF3 filler addition promoted higher properties compared to CaWO4 and Ta2O5 on Bis-EMA based root canal sealer.
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre - RS, Brazil.
authors.forename: Marcela Oliveira
authors.initials: MO
authors.lastname: de Souza
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre - RS, Brazil.
authors.forename: Vicente Castelo
authors.initials: VC
authors.lastname: Branco Leitune
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre - RS, Brazil.
authors.forename: Priscila Veit
authors.initials: PV
authors.lastname: Bohn
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre - RS, Brazil.
authors.forename: Susana Maria
authors.initials: SM
authors.lastname: Werner Samuel
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre - RS, Brazil.
authors.forename: Fabrício Mezzomo
authors.initials: FM
authors.lastname: Collares
keywords: Ethoxylated bisphenol-A-dimethacrylate; root canals sealer; ytterbium trifluoride