title: Efficacy of ProTaper retreatment system in root canals filled with gutta-percha and two endodontic sealers.
abstract: This study evaluated the efficacy of ProTaper Universal rotary retreatment system and hand files for filling material removal during retreatment and the influence of sealer type on the presence of filling debris in the reinstrumented canals. The canals of 60 palatal roots of first molars were obturated with gutta-percha and either a zinc oxide-eugenol-based or a resin-based sealer and reinstrumented: G1, EndoFill/hand files; G2, AH Plus/hand files; G3, EndoFill/ProTaper; G4, AH Plus/ProTaper. Roots were cleaved and examined with an optical microscope, and the amount of filling debris on canal walls was analyzed on digitized images. There was no significant difference (P > .05) among the root canal thirds within each group. G3 presented significantly more filling debris than G1 in the cervical third (P = .04). In the middle third, G2/G3/G4 showed more debris than G1 (P = .03). The techniques were similar (P = .64) in the apical third. All groups presented filling debris in the 3 canal thirds after reinstrumentation.
authors.affiliation: Department of Endodontics, University of Passo Fundo, Passo Fundo, RS, Brazil. endo-so@hotmail.com
authors.forename: Marcus Vinícius Reis
authors.initials: MV
authors.lastname: Só
authors.forename: Caroline
authors.initials: C
authors.lastname: Saran
authors.forename: Miriam Lago
authors.initials: ML
authors.lastname: Magro
authors.forename: Fabiana Vieira
authors.initials: FV
authors.lastname: Vier-Pelisser
authors.forename: Marcelo
authors.initials: M
authors.lastname: Munhoz
mesh_terms: D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D004853:Epoxy Resins / Q000627:therapeutic use; D006171:Gutta-Percha / Q000627:therapeutic use*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008437:Maxilla; D008853:Microscopy; D008963:Molar / Q000648:ultrastructure; D019279:Resin Cements / Q000627:therapeutic use; D019233:Retreatment; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D013499:Surface Properties; D019227:Tooth Apex / Q000648:ultrastructure; D019237:Tooth Cervix / Q000648:ultrastructure; D016896:Treatment Outcome; D015035:Zinc Oxide-Eugenol Cement / Q000627:therapeutic use
chemical_list: D004853:Epoxy Resins; D019279:Resin Cements; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C534916:epoxy resin-based root canal sealer; C074417:Endo-Fill; D006171:Gutta-Percha