title: Endodontic retreatment of thermafil or lateral condensation obturations in post space prepared teeth.
abstract: The purpose of this study was to quantify the amount of remaining gutta-percha/sealer after retreatment of post space prepared teeth obturated with a lateral condensation technique or with Thermafil with plastic and metallic carrier. The time required for retreatment was also recorded. Forty-five extracted mandibular premolars were prepared using a step-back flared technique and obturated. The post space was prepared and a 5-mm obturation was left in the canal. Retreatment of all groups was done using a solvent technique. The teeth were split longitudinally and photographed. The total area of the canal and the area of gutta-percha/sealer were traced on white paper. Both areas were quantified using a computerized image analysis system and the ratio of remaining obturation material to root canal periphery was derived and statistically analyzed. Statistical analysis (analysis of variance, p = 0.01) showed no differences among the techniques when the average percentage of remaining gutta-percha/sealer was compared. Results revealed that the Thermafil metallic retreatment group consumed significantly more time than the others (analysis of variance, Scheffe p = 0.01). The metallic carriers were not easily removed from the canals, six metal carriers could not be retrieved during the retreatment routine.
authors.affiliation: Ensino Odontológico Institute, São Paulo, Brazil.
authors.forename: M L
authors.initials: ML
authors.lastname: Zuolo
authors.forename: N
authors.initials: N
authors.lastname: Imura
authors.forename: M O
authors.initials: MO
authors.lastname: Ferreira
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D001729:Bismuth; D004338:Drug Combinations; D004853:Epoxy Resins; D006171:Gutta-Percha / Q000032:analysis; D006801:Humans; D008709:Methenamine; D011176:Post and Core Technique / Q000009:adverse effects*; D012086:Reoperation; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000295:instrumentation / Q000379:methods*; D012390:Root Canal Therapy / Q000295:instrumentation*; D012834:Silver; D012997:Solvents; D014025:Titanium; D014992:Xylenes
chemical_list: D004338:Drug Combinations; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D012997:Solvents; D014992:Xylenes; D012834:Silver; C028044:epoxy resin AH-26; D006171:Gutta-Percha; D014025:Titanium; D008709:Methenamine; D001729:Bismuth