title: New endodontic obturation systems and their interfacial bond strength with intraradicular dentine - ex vivo studies.
abstract: OBJECTIVE
  To comparatively evaluate adhesive properties of selected root canal fillings through the measurement of the material-dentine interfacial bond strength.
  
  
  METHODS
  Fifty extracted single-rooted human teeth with one canal each were prepared using Hero instruments to size 30.04. Teeth were divided into four subgroups depending on the root canal filling material and the method of obturation: Resilon/Epiphany - a thermoplastic method (IA), Resilon/Epiphany - a matching single-point method (IB), gutta-percha/Roeko Seal Automix - a thermoplastic method (IIA) and gutta-percha/Roeko Seal Automix - a matching single-point method (IIB). The obturated roots were cut perpendicular to the long axis to create 1.7 mm thick slices. The bond strength was measured for each test slice with push -out testing machine.
  
  
  RESULTS
  The highest push-out bond strength was registered in subgroup IB (3.98 ± 1.33 MPa). Significantly lower bond strength was observed in subgroups IA (0.50 ± 0.24 MPa), IIA (0.33 ± 0.18 MPa) and IIB (0.08 ± 0.03 MPa) (p<0.001). No statistically significant differences in material-dentine interfacial bond strength values were observed between IA and IIA, IA and IIB, IIA and IIB subgroups (p > 0.05).
  
  
  CONCLUSIONS
  The push-out bond strength of the material-dentine interface was dependent on the type of material used and the root canal filling technique. The R/E system exhibited better adhesion ability to intraradicular dentine than G/RSA. The highest bond strength was observed for Resilon/Epiphany introduced with the single-cone technique.
authors.affiliation: Department of Conservative Dentistry, Medical University of Bialystok, Bialystok, Poland. Malgorzata.Pawinska@umwb.edu
authors.forename: M
authors.initials: M
authors.lastname: Pawińska
authors.forename: A
authors.initials: A
authors.lastname: Kierklo
authors.forename: G
authors.initials: G
authors.lastname: Tokajuk
authors.forename: J
authors.initials: J
authors.lastname: Sidun
mesh_terms: D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D004853:Epoxy Resins / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D011312:Pressure; D012044:Regression Analysis; D015203:Reproducibility of Results; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods; D013314:Stress, Mechanical; D013718:Tensile Strength; D014070:Tooth / Q000502:physiology
chemical_list: D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D006171:Gutta-Percha