Group | Protocols |
---|---|
I | Chemomechanical preparation with a rotary motion by using Profile 04 system files (Dentsply-Maillefer) driven by the X-Smart Plus electric motor (Dentsply-Maillefer) at 300 rpm with a torque setting of 2 N.cm, with a slow in-and-out pecking motion that did not exceed 3–4 mm in amplitude, according to the crown-down philosophy without IFE, i.e., the apical limit was established around the AC (-0.5 mm from the AF identified by the apex locatora as 0.0 mm). A 2.5 mL aliquot of 2.5% NaOCl was used as an irrigating solution at each file use or change, applied with a NaviTip 31 G needle (Ultradent) up to 5 mm short of the AF. The same amount of NaOCl was used for each canal (40 mL) |
II | The exact specifications described for Group I, but with IFE, i.e., the apical limit was established at 0.5 mm beyond the AF (identified by the apex locatora as 0.0 mm) |
III | Chemomechanical preparation with a reciprocating motion by using Reciproc system files (VDW) driven by the X-Smart Plus electric motor (Dentsply-Maillefer), with a slow in-and-out pecking motion that did not exceed 3–4 mm in amplitude without IFE, i.e., the apical limit was established around the AC (-0.5 mm from the AF identified by the apex locatora as 0.0 mm). A 2.5 mL aliquot of 2.5% NaOCl was used as an irrigating solution at each file use or change, applied with a NaviTip 31 G needle (Ultradent) up to 5 mm short of the AF. The same amount of NaOCl was used for each canal (40 mL) |
IV | The exact specifications described for Group III, but with IFE, i.e., the apical limit was established at 0.5 mm beyond the AF (identified by the apex locatora as 0.0 mm) |