Abstract
BackgroundTricalcium silicate-based sealers have been usually indicated for the single-cone technique and result in more residual filling materials in root canal retreatment. Passive ultrasonic irrigation and photon-initiated photoacoustic streaming have been reported to improve the removal efficacy of root canal filling materials. However, the abilities of both techniques combined with NiTi re-instrumentation to remove residual tricalcium silicate-based sealer and gutta-percha have not been compared. The aim of this study was to evaluate the efficacy of laser-activated and ultrasonic-activated techniques in vitro for the removal of the tricalcium silicate-based sealer iRoot SP and gutta-percha after standard canal retreatment procedures with the use of nickel-titanium (NiTi) rotary instruments.
Highlights
Tricalcium silicate-based sealers have been usually indicated for the single-cone technique and result in more residual filling materials in root canal retreatment
Compared to Passive ultrasonic irrigation (PUI) and classic syringe-based irrigation (CSI), activation of 2.5% sodium hypochlorite and 17% ethylenediaminetetraacetic acid (EDTA) with Photon-initiated photoacoustic streaming (PIPS) greatly improved the removal of the residual iRoot SP and gutta-percha following NiTi mechanical retreatment
To satisfy periapical healing after root canal retreatment, the previous filling materials should be adequately removed, and the patency and the Working length (WL) should be established during retreatment [31]. iRoot SP sealer based on a calcium silicate composition has the potential to adhere chemically to dentin [32]
Summary
Tricalcium silicate-based sealers have been usually indicated for the single-cone technique and result in more residual filling materials in root canal retreatment. Passive ultrasonic irrigation and photon-initiated photoacoustic streaming have been reported to improve the removal efficacy of root canal filling materials. The abilities of both techniques combined with NiTi re-instrumentation to remove residual tricalcium silicate-based sealer and gutta-percha have not been compared. The aim of this study was to evaluate the efficacy of laser-activated and ultrasonic-activated techniques in vitro for the removal of the tricalcium silicate-based sealer iRoot SP and gutta-percha after standard canal retreatment procedures with the use of nickel-titanium (NiTi) rotary instruments. Passive ultrasonic irrigation (PUI) is an ultrasonic-activated treatment modality for removing bacteria, smear layers and dental debris [8, 9] through acoustic streaming and cavitation with noncutting action to irrigation solution in the root canal. Neither PUI nor NiTi instrumentation can completely remove the gutta-percha and sealers from root canals [14]
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