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

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 retreatmant, 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) ; Group 3: AH Plus sealer (Dentsply DeTrey, Konstanz, Germany). Cold lateral condensation technique was used. After two weeks, the root canals were retreated with a rotary 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 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 retreated and Endosequence and AH Plus had similar retreatment ability. The PIPS improved the removal of filling reminants in all groups.

calcium silicate, retreatment, ProTaper, laser activated irrigation, micro-CT

DOI: 10.1007/s10103-017-2325-4