title: Comparative study of retreatment of Thermafil and lateral condensation endodontic fillings.
abstract: The aim of the present study was to evaluate the possibility of retreating teeth obturated with: (i) Thermafil with plastic carrier, (ii) Thermafil with metallic carrier and (iii) laterally condensed gutta-percha. The following aspects were analysed: removal of obturation, time required for removal, remaining filling material and apical extrusion during reinstrumentation. Thirty human teeth with a single canal were instrumented up to a size 45 K-type file, divided into three groups of 10 teeth each and obturated with Thermafil with plastic carrier (group 1), Thermafil with metallic carrier (group 2), and laterally condensed gutta-percha (group 3) with AH26 as the sealer. Reinstrumentation was performed manually after 30 days storage using Hedstroem files and xylene as a solvent. The average time needed to remove the obturation was 12 min 1 s for group 1, 14 min 36 s for group 2 and 11 min 26 s for group 3. Although no statistically significant differences were observed between groups 1 and 2, and 1 and 3 (P > 0.05), the differences between groups 2 and 3 were significant (P < 0.05). The amount of remaining filling material was significantly higher in group 2 when compared with groups 1 and 2 (P < 0.01). Although the lowest incidence of apical extrusion during reinstrumentation was found in group 3, the differences among groups were not statistically significant.
authors.affiliation: Department of Endodontics, School of Dentistry, University of El Salvador-Asociación Odontológica Argentina, Buenos Aires.
authors.forename: S R
authors.initials: SR
authors.lastname: Frajlich
authors.forename: F
authors.initials: F
authors.lastname: Goldberg
authors.forename: E J
authors.initials: EJ
authors.lastname: Massone
authors.forename: C
authors.initials: C
authors.lastname: Cantarini
authors.forename: L P
authors.initials: LP
authors.lastname: Artaza
mesh_terms: D000704:Analysis of Variance; D016009:Chi-Square Distribution; D017005:Dental Debonding; D005069:Evaluation Studies as Topic; D006171:Gutta-Percha; D006801:Humans; D019233:Retreatment; D012389:Root Canal Obturation / Q000295:instrumentation / Q000379:methods*; D016896:Treatment Outcome; D014992:Xylenes
chemical_list: D014992:Xylenes; D006171:Gutta-Percha