title: Clinical microscopic analysis of ProTaper retreatment system efficacy considering root canal thirds using three endodontic sealers.
abstract: To evaluate the efficacy of ProTaper Universal rotary retreatment system and the influence of sealer type on the presence of filling debris in the reinstrumented canals viewed in an operative clinical microscope. Forty-five palatal root canals of first molars were filled with gutta-percha and one of the following sealers: G1, EndoFill; G2, AH Plus; G3, Sealapex. The canals were then reinstrumented with ProTaper Universal rotary system. Roots were longitudinally sectioned and examined under an operative clinical microscope (10×), and the amount of filling debris on canal walls was analyzed using the AutoCAD 2004 software. A single operator used a specific software tool to outline the canal area and the filling debris area in each third (cervical, middle, and apical), as well as the total canal area. Data were analyzed by Kruskal-Wallis test and Tukey test at P < 0.05. Sealapex demonstrated significant differences in the average of filling debris area/canal among the 3 thirds. This group revealed that apical third showed more debris than the both cervical and middle third (P < 0.0001). Endofill presented significantly more filling debris than Sealapex in the cervical third (P < 0.05). In the middle (P = 0.12) and apical third (P = 0.10), there were no differences amongst groups. Debris was left in all canal thirds, regardless of the retreatment technique. The greatest differences between techniques and sealers were found in the cervical third.
authors.affiliation: School of Dentistry, Rio Grande do Sul Federal University-UFRGS, Porto Alegre-Rio Grande do Sul, Brazil. endo-so@hotmail.com
authors.forename: Marcus Vinícius Reis
authors.initials: MV
authors.lastname: Só
authors.forename: Jose Antônio Poli
authors.initials: JA
authors.lastname: De Figueiredo
authors.forename: Elaine Vianna
authors.initials: EV
authors.lastname: Freitas Fachin
authors.forename: Marco Antônio
authors.initials: MA
authors.lastname: Húngaro Duarte
authors.forename: Jefferson Ricardo
authors.initials: JR
authors.lastname: Pereira
authors.forename: Milton Carlos
authors.initials: MC
authors.lastname: Kuga
authors.forename: Ricardo Abreu
authors.initials: RA
authors.lastname: Da Rosa
mesh_terms: D003786:Dental Pulp Cavity / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans; D008853:Microscopy; D008963:Molar / Q000737:chemistry*; D019233:Retreatment / Q000379:methods; D012387:Root Canal Filling Materials / Q000032:analysis* / Q000494:pharmacology*; D016896:Treatment Outcome
chemical_list: D012387:Root Canal Filling Materials