title: Effect of 17% EDTA and MTAD on intracanal smear layer removal: a scanning electron microscopic study.
abstract: The purpose of this study was to determine the effectiveness of MTAD as the final irrigant to remove the smear layer, compared with that of 17% EDTA, both following root canal irrigation with 5.25% sodium hypochlorite (NaOCl). Fifty-five extracted maxillary and mandibular single-rooted human teeth were prepared by a crown-down technique using rotary 0.04 and 0.06 taper nickel-titanium files. 5.25% sodium hypochlorite was used as the intracanal irrigant. The canals were then treated with 5 mL of one of the following solutions as final rinse: 5.25% sodium hypochlorite, 17% EDTA or MTAD. The presence or absence of smear layer in the coronal, middle and apical portion of each canal was examined with a scanning electron microscope. The results showed that MTAD is an effective final rinse solution for removing the smear layer in canals irrigated with sodium hypochlorite. When 17% EDTA was used as a final rinse, the smear layer was removed from the middle and coronal thirds of canal preparations, but it was less effective in the apical third of the canals.
authors.affiliation: Department of Endodontics, Iranian Center for Endodontic Research, Shaheed Beheshti University of Medical Sciences, Dental School, Tehran, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Mozayeni
authors.forename: Ghasem Hossein
authors.initials: GH
authors.lastname: Javaheri
authors.forename: Pardis
authors.initials: P
authors.lastname: Poorroosta
authors.forename: Mohammad Asna
authors.initials: MA
authors.lastname: Ashari
authors.forename: Homan Hossein
authors.initials: HH
authors.lastname: Javaheri
mesh_terms: D019343:Citric Acid; D004318:Doxycycline; D004492:Edetic Acid; D006801:Humans; D008855:Microscopy, Electron, Scanning; D011136:Polysorbates; D012388:Root Canal Irrigants; D018915:Root Canal Preparation / Q000379:methods*; D016369:Smear Layer; D012973:Sodium Hypochlorite
chemical_list: C475043:MTAD (intracanal irrigant); D011136:Polysorbates; D012388:Root Canal Irrigants; D019343:Citric Acid; D004492:Edetic Acid; D012973:Sodium Hypochlorite; D004318:Doxycycline