title: Efficacy of two rotary NiTi instruments in the removal of Gutta-Percha during root canal retreatment.
abstract: The aim of this study was to evaluate the efficacy of ProTaper and K3 in the removal of gutta-percha during root canal retreatment in comparison with hand Hedstrom files. Time of gutta-percha removal and amount of apically extruded debris were also evaluated. Sixty extracted single-rooted anterior teeth and premolars were instrumented and obturated with laterally condensed gutta-percha technique. The teeth were cleared and randomly divided into three groups of 20 teeth each. The roots were split longitudinally, digital images were created using a scanner, and the areas of remaining filling material were traced using Ulead Photoimpact7 then calculated using SigmaScan software. The results indicated that the two rotary nickel-titanium instruments left significantly less remaining filling material than hand instruments (p < 0.001). The ProTaper and K3 required significantly less time for filling material removal than hand instruments (p < 0.001). There was no statistically significant difference among the three techniques regarding the amount of apically extruded debris (p = 0.159). In conclusion, ProTaper and K3 were found to be effective and faster in removing gutta-percha.
authors.affiliation: Department of Oral Biology, Department of Endodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt.
authors.forename: Abdulhamied Y
authors.initials: AY
authors.lastname: Saad
authors.forename: Solaiman M
authors.initials: SM
authors.lastname: Al-Hadlaq
authors.forename: Nasser H
authors.initials: NH
authors.lastname: Al-Katheeri
mesh_terms: D000704:Analysis of Variance; D006171:Gutta-Percha; D006801:Humans; D009532:Nickel; D019233:Retreatment / Q000295:instrumentation; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D013997:Time Factors; D014025:Titanium
chemical_list: C040654:titanium nickelide; D009532:Nickel; D006171:Gutta-Percha; D014025:Titanium