title: Influence of Apical Preparation Size and Working Length on Debris Extrusion.
abstract: The aim of this study was to quantitatively evaluate the amount of apically extruded debris by single-file reciprocating instruments with different working lengths and apical preparation sizes. Eighty human single-rooted mandibular incisors were used and conventional access cavities were prepared. Then, the specimens were divided into four groups (n=20), according to root canal instrumentation: Reciproc size 25, .08 taper and Reciproc size 40, .06 taper instruments were used at the foramen; Reciproc size 25, .08 taper and Reciproc size 40, .06 taper instruments were used 1 mm short of the foramen. Distilled water was used as an irrigant and the apically extruded debris were collected in pre-weighted glass vials and dried afterwards. The mean weight of debris was weighed with a microbalance and statistically analyzed using one-way analysis of variance and the post hoc Tukey multiple comparison test (p<0.05). The results showed that all experimental groups were associated with debris extrusion. No significant difference was found in the amount of apically extruded debris among all experimental groups (p>0.05). The present study demonstrated that the working length and the apical preparation size did not have a significant effect on debris extrusion when performing single-file reciprocating instrumentation.
authors.affiliation: Universidade Grande Rio, Rio de Janeiro, RJ, Brazil.
authors.forename: Emmanuel João Nogueira Leal
authors.initials: EJ
authors.lastname: Silva
authors.affiliation: Universidade Estadual do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: João M
authors.initials: JM
authors.lastname: Teixeira
authors.affiliation: Universidade Estadual do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Nancy
authors.initials: N
authors.lastname: Kudsi
authors.affiliation: Universidade Estadual do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Luciana M
authors.initials: LM
authors.lastname: Sassone
authors.affiliation: Universidade Estadual do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Renato L
authors.initials: RL
authors.lastname: Krebs
authors.affiliation: Universidade Estadual do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Tauby S
authors.initials: TS
authors.lastname: Coutinho-Filho
mesh_terms: D006801:Humans; D018915:Root Canal Preparation / Q000379:methods; D019227:Tooth Apex / Q000473:pathology*