title: Influence of Root Canal Tapering on Smear Layer Removal.
abstract: The purpose of the study presented here was to compare the influence of root canal taper on the efficacy of irrigants and chelating agents in smear layer removal. Eighty mesial roots of molar teeth were selected and prepared with rotary instruments. In group A, file 30/0.02 and in group B, file 30/0.4 were placed at working length and the smear layer was removed. In groups C and D, root canal preparation was the same as in groups A and B, respectively, except that the smear layer was not removed. The amount of the smear layer was quantified using a scanning electron microscope. Greater smear layer was detected in the apical portion of each group, whereas no significant difference was detected between groups in other portions. No statistical difference was found between canals with different tapers.
authors.forename: Mina
authors.initials: M
authors.lastname: Zarei
authors.forename: Maryam
authors.initials: M
authors.lastname: Javidi
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Afkhami
authors.forename: Behrad
authors.initials: B
authors.lastname: Tanbakuchi
authors.forename: Mohsen Movahed
authors.initials: MM
authors.lastname: Zadeh
authors.forename: Marzieh Maghadam
authors.initials: MM
authors.lastname: Mohammadi
mesh_terms: D002614:Chelating Agents / Q000627:therapeutic use*; D003786:Dental Pulp Cavity / Q000187:drug effects / Q000648:ultrastructure; D004492:Edetic Acid / Q000627:therapeutic use; D004867:Equipment Design; D006801:Humans; D066298:In Vitro Techniques; D008855:Microscopy, Electron, Scanning; D011897:Random Allocation; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods*; D016369:Smear Layer / Q000188:drug therapy* / Q000473:pathology; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D013499:Surface Properties; D019227:Tooth Apex / Q000187:drug effects / Q000648:ultrastructure
chemical_list: D002614:Chelating Agents; D012388:Root Canal Irrigants; D004492:Edetic Acid; D012973:Sodium Hypochlorite