title: Periapical repair in dog teeth: root canal adhesive filling by using the Resilon System.
abstract: BACKGROUND
  New filling biomaterials with better physicochemical properties would create a favorable biologic environment for the healing of periapical tissues. The aim of this study was to evaluate periapical repair after biomechanical preparation and root filling with an adhesive system compared with the gold standard material (gutta-percha+sealer) in dog teeth.
  
  
  METHODS
  The pulp of 25 root canals was removed. The apical cementum layer was perforated, and the root canals were prepared up to size #60 K-file followed by step-back shaping with the #90 K-file and filled by the lateral condensation technique. In the experimental group (n=15), the Resilon System (Pentron Clinical Technologies, Wallingford, CT) was used. As a control material (n=10), gutta-percha cones and pulp canal sealer were used. After 60 days, the animals were killed, and 10 histologic parameters were evaluated. Differences among the groups were analyzed by using the Mann-Whitney and Fisher exact tests.
  
  
  RESULTS
  In radiographic and histologic evaluations, most fillings were slightly short of the apex. Progressive regenerative stages were observed; however, there was a reduced prevalence of biologic foraminal closure. No significant differences were observed between the 2 biomaterials with regard to any of the parameters evaluated (P>.05).
  
  
  CONCLUSIONS
  The Resilon System shows periapical biocompatibility equivalent to the gold standard material.
authors.affiliation: Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, MG, Brazil.
authors.forename: Débora Silveira
authors.initials: DS
authors.lastname: Brasil
authors.forename: Janir Alves
authors.initials: JA
authors.lastname: Soares
authors.forename: Martinho Campolina Rebello
authors.initials: MC
authors.lastname: Horta
authors.forename: Cynthia Lopes
authors.initials: CL
authors.lastname: Ferreira
authors.forename: Eduardo
authors.initials: E
authors.lastname: Nunes
authors.forename: Guilherme G
authors.initials: GG
authors.lastname: Chaves
authors.forename: Frank Ferreira
authors.initials: FF
authors.lastname: Silveira
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000627:therapeutic use*; D004285:Dogs; D004853:Epoxy Resins / Q000627:therapeutic use; D006171:Gutta-Percha / Q000627:therapeutic use; D008334:Mandible; D010519:Periodontium / Q000187:drug effects; D012038:Regeneration / Q000187:drug effects; D019279:Resin Cements / Q000627:therapeutic use; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D012389:Root Canal Obturation / Q000379:methods*; D018709:Statistics, Nonparametric; D019227:Tooth Apex / Q000187:drug effects*; D015035:Zinc Oxide-Eugenol Cement / Q000627:therapeutic use
chemical_list: D001672:Biocompatible Materials; D004853:Epoxy Resins; D019279:Resin Cements; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C486892:resilon sealer; C076543:Kerr Pulp Canal Sealer; D006171:Gutta-Percha