Comparison of Rotary and Reciprocating Instrumentation Techniques in the Removal of Filling Material from Root Canals

Svrha ovog ex vivo istraživanja bila je ispitati i usporediti učinkovitost rotacijske (ProTaper Universal Retreatment) i dvije recipročne tehnike (Reciproc i Reciproc Blue) instrumentacije u uklanjanju materijala za punjenje temeljenog na epoksi smoli iz korijenskog kanala. U istraživanju je korišteno 30 humanih izvađenih jednokorijenskih zuba. Nakon instrumentacije ProTaper Next tehnikom instrumentacije (Dentsply, Baillaigues, Švicarska), kanali su napunjeni gutaperka štapićima i punilom temeljenim na epoksi smoli (AH Plus, Dentsply DeTrey, Konstanz, Njemačka) tehnikom hladne lateralne kondenzacije. Nakon sedam dana, uzorci su nasumično raspoređeni u tri eksperimentalne skupine (n = 10) ovisno o tehnici revizije. Skupina 1. ProTaper Universal rotacijska tehnika revizije (Dentsply, Ballaigues, Švicarska); skupina 2. Reciproc recipročna tehnika instrumentacije (VDW, München, Njemačka); skupina 3. Reciproc Blue recipročna tehnika instrumentacije (VDW, München, Njemačka). Svi uzorci su snimani mikro-kompjuteriziranim tomografskim (mikro-CT) uređajem nakon punjenja korijenskog kanala te nakon rotacijske i recipročne revizije. U analizi između ispitivanih skupina i tehnika revizije koristio se Kruskal-Wallis test uz dodatni Box i Whisker plot test. Rezultati su pokazali značajno smanjenje količine punila u svim skupinama nakon sve tri tehnike revizije (p < 0,05). Reciproc tehnika revizije je učinkovitija u uklanjanju punila u usporedbi s ProTaper Universal i Reciproc Blue tehnikom (p < 0,001, p = 0,07), između kojih nije bilo značajne razlike (p = 0,085). Reciproc tehnika revizije je bila najučinkovitija u uklanjanju materijala za punjenje iz korijenskog kanala, a nije bilo razlike između ProTaper Universal i Reciproc Blue tehnike revizije.The aim of this ex vivo study was to evaluate and compare the efficacy of the rotary system (ProTaper Universal Retreatment) and two reciprocating systems (Reciproc and Reciproc Blue) in the removal of root canal filling material from the root canals. Thirty human, extracted, single-rooted teeth were instrumented using the Pro-Taper Next (Dentsply, Baillaigues, Switzerland) technique and filled with guttapercha and epoy-resin based sealer (AH Plus, Dentsply DeTrey, Konstanz, Germany) using cold lateral condensation technique. After seven days, the specimens were randomly divided into three groups (n = 10) according to the retreatment system used. Group 1. Rotary ProTaper Universal technique; Group 2. Reciprocating Reciproc technique; Group 3. Reciprocating Reciproc Blue technique. All specimens were scanned in a micro-computed tomographic (micro-CT) device after root canal filling and after the retreatment with rotary and reciprocating instruments. Results were statistically analyzed with Kruskal-Wallis test and additional Box and Whisker plot test. Results showed statistically significant (p < 0.05) reduction of the filling material in all three groups. Retreatment with the Reciproc system was the most effective in the removal of the filling material in comparsion with the ProTaper Universal and Reciproc Blue (p < 0.001, p = 0.07), that were equally effective (p = 0.085). The Reciproc reciprocating system was the most effective in the removal of filling material, while there was no significant difference between the ProTaper Universal retreatment system and The Reciproc Blue system

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

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