The effect of different concentrations of EDTA on instrumented root canal walls.
OBJECTIVE
The purpose of this study was to investigate smear layer removal and erosive capacity of different concentrations of EDTA on instrumented root canal walls.


METHODS
Forty single-rooted teeth were instrumented using step-back technique and 2.5% NaOCl. The teeth were randomly divided into 4 groups, and final flushes were preformed with different concentrations of EDTA (15%, 10%, 5%, and 1%). All specimens were prepared for scanning electron microscope evaluation.


RESULTS
The results showed that there was no significant difference on the smear layer removal between different concentrations of EDTA (P = .1959). Only coronal versus apical thirds showed significant difference regarding presence of smear layer (P = .0176). Whereas 15%, 10%, and 5% EDTA solutions demonstrated similar erosion patterns on the root canal walls (P > .05), 1% EDTA caused restricted erosion (P < .0001). There was no significant difference among the regions in terms of erosion (P = .6399).


CONCLUSIONS
Lower concentrations of EDTA can be recommended for clinical usage to avoid excessive erosion of root canal dentin.
Sen
Bilge Hakan
BH
Division of Endodontology, School of Dentistry, Ege University, Izmir, Turkey. bilge.hakan.sen@ege.edu.tr
Ertürk
Ozlem
O
Pişkin
Beyser
B
D002614:Chelating Agents / Q000008:administration & dosage* / Q000494:pharmacology; D003786:Dental Pulp Cavity / Q000187:drug effects* / Q000648:ultrastructure; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure; D004492:Edetic Acid / Q000008:administration & dosage* / Q000494:pharmacology; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D012388:Root Canal Irrigants / Q000008:administration & dosage* / Q000494:pharmacology; D018915:Root Canal Preparation / Q000379:methods*; D016369:Smear Layer; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D019227:Tooth Apex / Q000187:drug effects / Q000648:ultrastructure
D002614:Chelating Agents; D012388:Root Canal Irrigants; D004492:Edetic Acid; D012973:Sodium Hypochlorite