The efficacy of photon-initiated photoacoustic streaming in the removal of calcium silicate-based filling remnants from the root canal after rotary retreatment

Abstract

The aim of the study was to evaluate the efficacy of photon-initiated photoacoustic streaming (PIPS) in the removal of filling remnants from root canals after rotary phase of retreatment and to examine the difference in the amount of residual material considering the type of sealer. Thirty-six extracted single-rooted human teeth were instrumented and randomly divided into three groups according to the filling material used: group 1: EndoSequence BC Sealer (Brassler, USA), group 2: MTA Fillapex (Angelus Solucoes Odontologicas, Londrina, Brasil), and group 3: AH Plus sealer (Dentsply DeTrey, Konstanz, Germany). Cold lateral condensation technique was used. After 2 weeks, the root canals were retreated with a rotary phase retreatment system (ProTaper Universal Retreatment, Maillefer, Ballaigues, Switzerland), followed by Er:YAG laser-activated irrigation (photon-initiated photoacoustic streaming, PIPS). The specimens were scanned in a micro-computed tomographic (micro-CT) device after root canal filling, after the rotary retreatment, and after the PIPS. There was significant reduction in the amount of filling material after the rotary phase of retreatment in all groups (p < 0.05), the highest in the MTA Fillapex group (p < 0.001) and no difference between the EndoSequence BC and the AH Plus (p = 0.608). There was significant reduction of the filling remnants after the PIPS in all groups (p < 0.05). The MTA Fillapex was the most easily removed during rotary phase of the retreatment, and there were no differences in the amount of the remaining filling material between EndoSequence BC and the AH Plus groups after rotary phase of the retreatment. The PIPS improved the removal of filling remnants in all groups.

Comparison of the effectiveness of various rotary and reciprocating systems with different surface treatments to remove gutta‐percha and an epoxy resin‐based sealer from straight root canals

“…The teeth were prepared according to the protocol described by Suk et al . (). Access openings were prepared using a water‐cooled diamond fissure bur No.…”

“…, Suk et al . ). However, complete removal of the epoxy resin‐based sealer has not been achieved in any of the previously published study regardless of the filling technique and retreatment technique used (Bernardes et al .…”

The efficacy of different irrigation protocols in removing tricalcium silicate‐based sealers from simulated root canal irregularities

“…Studies evaluating the retreatability of root canal filling materials used different observation methods such as SEM, light microscope, digital camera, micro CT, or cone-beam computed tomography (Donnermeyer et al, 2018;Fenoul, Meless, & Pérez, 2010;Grischke et al, 2014;Neelakantan et al, 2013;Suk et al, 2017). Use of digital camera and light microscope can be adequate for the evaluation of cleanliness of the simulated grooves as they are standardized areas of low volume.…”

Evaluation of filling material remnants after basic preparation, apical enlargement and final irrigation in retreatment of severely curved root canals in extracted teeth

“…Considering the abundance of previous research that demonstrates the limitations of basic instrumentation for the removal of filling material from the root canal, newer approaches are currently being investigated in the hope of improving the filling remnant removal. Numerous activated irrigation techniques have been proposed as adjunct treatment protocols to follow mechanical retreatment, such as ultrasonically activated irrigation (Bernardes et al 2016, Pedullà et al 2019), sonic‐activated irrigation (Kaloustian et al 2019) and laser‐activated irrigation (Suk et al 2017). To date, few studies have evaluated the additional steps of instrumentation using various adjustable instruments (Self‐adjusting File, ReDentNova, Berlin, Deutchland; XP‐endo Shaper and Finisher, FKG, La Chaux de Fonds, Switzerland; and TRUShape, Dentsply Sirona, Ballaigues, Switzerland).…”