title: Effect of different root canal obturating materials on push-out bond strength of a fiber dowel.
abstract: OBJECTIVE
  During dowel space preparation, the instrumentation forms a thick smear layer along with sealer-occluded dentinal tubules. The purpose of this study was to evaluate the effect of different obturating materials on push-out bond strength of a fiber dowel.
  
  
  METHODS
  Fifty human uniradicular teeth were decoronated and prepared using the step-back technique. The specimens were divided into five groups on the basis of obturating materials: group I received no obturation; group II (ZOE) gutta-percha and zinc oxide eugenol sealer; group III (ZOAH) gutta-percha and AH plus sealer; group IV (GF) GuttaFlow; and group V (RE) with Resilon Epiphany system. Dowel spaces were made with manufacturer's provided drills, and a fiber dowel was luted. Horizontal slices were obtained from the middle third, and push-out bond strength (S) was evaluated. Statistical analysis was carried out using one-way ANOVA and post hoc Tukey's test.
  
  
  RESULTS
  The push-out bond strength values in the control group, ZOE, ZOAH, GF, and RE were 9.303 ± 0.565 MPa, 8.859 ± 0.539 MPa, 8.356 ± 0.618 MPa, 9.635 ± 0.435 MPa, and 8.572 ± 0.256 MPa, respectively. There was no statistically significant difference between the S values of all the groups (p > 0.05).
  
  
  CONCLUSIONS
  There was no effect of different tested obturating materials on the push-out bond strength of fiber dowels; however, further studies should be conducted.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India. drvivekaggarwal@gmail.com
authors.forename: Vivek
authors.initials: V
authors.lastname: Aggarwal
authors.forename: Mamta
authors.initials: M
authors.lastname: Singla
authors.forename: Sanjay
authors.initials: S
authors.lastname: Miglani
authors.forename: Sarita
authors.initials: S
authors.lastname: Kohli
mesh_terms: D001840:Dental Bonding; D017267:Dental Prosthesis Design; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D003799:Dental Stress Analysis / Q000295:instrumentation; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D004338:Drug Combinations; D004853:Epoxy Resins / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods; D055116:Self-Curing of Dental Resins; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
chemical_list: D004129:Dimethylpolysiloxanes; D004338:Drug Combinations; D004853:Epoxy Resins; C515718:GuttaFlow; D019279:Resin Cements; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C486893:epiphany sealer; C534916:epoxy resin-based root canal sealer; C486892:resilon sealer; D006171:Gutta-Percha