Efficacy of ProTaper Retreatment System in Root Canals Filled with Gutta-Percha and Two Endodontic Sealers

Efficacy of ProTaper Retreatment System in Root Canals Filled with Gutta-Percha and Two Endodontic Sealers
Journal of Endodontics
Volume 34, Issue 10, October 2008, Pages 1223-1225

Marcus VinÃcius Reis S€ DDS, MSc, PhD*, Caroline Saran DDS*, Miriam Lago Magro DDS, MSc*, Fabiana Vieira Vier-Pelisser DDS, MSc, PhD,‹ and Marcelo Munhoz DDS·
‹Department of Endodontics, Uning?, Caxias do Sul, RS, Brazil
·Department of Endodontics, University of RibeirÑo Preto, RibeirÑo Preto, SP, Brazil *Department of Endodontics, University of Passo Fundo, Passo Fundo, RS, Brazil

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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 oxideÒeugenolÒbased 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.

Key Words: Endodontic retreatment; endodontics; root canal filling