title: In vitro comparison of different reciprocating systems used during endodontic retreatment.
abstract: The present study evaluated the effectiveness of two reciprocating systems for the removal of root-filling material during endodontic retreatment. One hundred extracted mandibular premolars were prepared and root-filled with gutta-percha and sealer. Root fillings were removed with K-files according to the following techniques: Group A--hand instrumentation; Group B--Endo-Gripper system driven by compressed air; Group C--INTRAmatic 29CH + INTRA-LUX 3LD driven by compressed air; Group D--Endo-Gripper system driven by electric engine; Group E--INTRAmatic 29CH + INTRA-LUX 3LD driven by electric engine. The amount of filling debris on root canal walls was assessed radiographically and analysed using Auto CAD 2000 software. One-way anova and Duncan's test revealed statistically significant differences only in the middle third (P = 0.01); the best results being reached in group D. The apical third displayed the greatest amount of filling material debris, regardless of the technique used.
authors.affiliation: Lutheran University of Brazil, Canoas, Rio Grande do Sul, Brazil.
authors.forename: Paulo Roberto
authors.initials: PR
authors.lastname: Zanettini
authors.forename: Fernando Branco
authors.initials: FB
authors.lastname: Barletta
authors.forename: Nicole
authors.initials: N
authors.lastname: de Mello Rahde
mesh_terms: D000388:Air; D001641:Bicuspid; D017005:Dental Debonding / Q000295:instrumentation*; D003748:Dental Equipment; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging; D055615:Electrical Equipment and Supplies; D006171:Gutta-Percha; D006801:Humans; D019252:Radiography, Dental, Digital; D019233:Retreatment; D012387:Root Canal Filling Materials; D018915:Root Canal Preparation / Q000295:instrumentation*; D016369:Smear Layer
chemical_list: D012387:Root Canal Filling Materials; D006171:Gutta-Percha