Master of Science in Dentistry
Purpose: To evaluate in vitro smear layer dissolution using alternative chelating solutions in comparison to EDTA.
Methods: Nine extracted human anterior teeth were sectioned into dentin discs. Test solutions included: peracetic acid (PAA) at various concentrations (0.1%, 0.2%, 0.3%, 1%, 2%) for 60sec, 17% EDTA for 60sec, 18% 1-hydroxyethane 1,1-diphosphonic acid (HEDP)+NaOCl for 5min, HEDP alone for 5min and QMix for 60sec. SEM and a 4-point scale were used to evaluate smear layer removal.
Results: EDTA for 60sec had significantly better scores in dissolving the smear layer than all other groups. There was no significant difference between HEDP and HEDP+NaOCl for 5min, but both had significantly better scores in dissolving the smear layer than PAA at all concentrations and QMix at 60sec.
Conclusion: EDTA for 60sec was the most effective at dissolving the smear layer, followed by HEDP and HEDP+NaOCl for 5min. PAA at all tested concentrations and QMix for 60sec were not effective.
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