Abstract
This study evaluated smear layer removal in apical and middle root thirds using five different fiberoptic tip withdrawal techniques. Thirty human canines were instrumented using 2.5% sodium hypochlorite, with a final irrigation of distilled water, and divided randomly in 6 different groups. Er:YAG laser was applied in 5 groups with a 50/28 fiberoptic tip (250 mJ input, 112 mJ output, 10 Hz, 1 mm from apex) with distinct withdrawal techniques. Group 6 did not receive laser irradiation. Two pieces of each root canal (middle and apical thirds) were obtained under the SEM and analyzed for the amount of smear layer. Results showed statistical differences (p<0.05) between treatments and significant differences (p<0.01) between radicular thirds. It can be concluded that 1) all withdrawal techniques produced the same results on smear layer removal and 2) the middle third presented less smear layer t han the apical third after Er:YAG laser irradiation.
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