title: Sealing ability of oval-shaped canals filled using the System B heat source with either gutta-percha or Resilon: an ex vivo study using a polymicrobial leakage model.
abstract: OBJECTIVE
  The present study systematically compared the sealing ability of oval-shaped canals filled using the System B heat source with either gutta-percha/sealer or Resilon/Epiphany.
  
  
  METHODS
  Eighty mandibular incisors with oval-shaped canals were selected after buccolingual and mesiodistal radiographs and divided into 3 experimental groups (n = 20). The teeth were obturated as follows: G1: gutta-percha/Pulp Canal Sealer EWT using cold lateral condensation; G2: gutta-percha/Pulp Canal Sealer EWT using the System B heat source; and G3: Resilon tips and Epiphany sealer using the System B heat source. The roots were mounted in a bacterial leakage model and the system was checked daily during the following 9 weeks. The log rank test was used to analyze the leakage data at intervals of 3, 6, and 9 weeks. The level of significance was set at P < .05.
  
  
  RESULTS
  Seven samples of G1 (35%) and 5 samples (20%) each of G2 and G3 were fully contaminated after 9 weeks. Data showed no significant difference between traditional gutta-percha/sealer and Resilon/Epiphany (P > .05). However, both materials showed significant difference to cold lateral condensation when System B heat source was used (P < .05).
  
  
  CONCLUSIONS
  The results demonstrated that Resilon/Epiphany combination do not improve the bacterial leakage resistance compared with traditional gutta-percha/sealer fillings.
authors.affiliation: Department of Endodontics, Rio de Janeiro State University, Rio de Janeiro, Brazil. endogus@gmail.com
authors.forename: Gustavo
authors.initials: G
authors.lastname: De-Deus
authors.forename: Cristiane
authors.initials: C
authors.lastname: Audi
authors.forename: Cristiana
authors.initials: C
authors.lastname: Murad
authors.forename: Sandra
authors.initials: S
authors.lastname: Fidel
authors.forename: Rivail Antonio Sergio
authors.initials: RA
authors.lastname: Fidel
mesh_terms: D003763:Dental Leakage / Q000517:prevention & control*; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D006171:Gutta-Percha; D006358:Hot Temperature; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology; D008334:Mandible; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C486893:epiphany sealer; C486892:resilon sealer; C076543:Kerr Pulp Canal Sealer; D006171:Gutta-Percha