Effect of three different time periods of irrigation with EDTA-T, EDTA, and citric acid on smear layer removal.
OBJECTIVE
An in vitro study was conducted to evaluate the effect of EDTA-T, 17% EDTA, and 10% citric acid on the removal of smear layer from root canal dentin after final irrigation for 3, 10, and 15 min.


METHODS
Root canals of 90 extracted human canines were divided into 9 groups of 10 teeth; each group received a final irrigation with one of the irrigants for the established time intervals. After irrigation, the teeth were split and prepared for SEM analysis to determine the number of open dentinal tubules.


RESULTS
There were statistically significant better results (P <.05) when irrigation with 10% citric acid for 3 min was compared to 10 and 15 min, and when irrigation with EDTA for 3 min was compared to 15 min. In all cases, irrigation for 3 min presented the greatest number of open dentinal tubules. There were no significant differences (P>.05) for the 3 time intervals of irrigation for EDTA-T, although there were a greater number of open tubules at 3 min.


CONCLUSIONS
These 3 irrigants were effective at the shortest time tested and did not demonstrate an improved effect with an increase in time.
Scelza
Mriam F Zaccaro
MF
Department of Endodontics, Federal Fluminense University (UFF), Niterói, RJ, Brazil. scelza@terra.com.br
Pierro
Viviane
V
Scelza
Pantaleo
P
Pereira
Mário
M
D019343:Citric Acid / Q000008:administration & dosage*; D003481:Cuspid / Q000187:drug effects*; D004492:Edetic Acid / Q000008:administration & dosage*; D006801:Humans; D018625:Microscopy, Atomic Force; D016369:Smear Layer; D018709:Statistics, Nonparametric; D007507:Therapeutic Irrigation; D013997:Time Factors
D019343:Citric Acid; D004492:Edetic Acid