hrvatski

Effect of novel laser-initiated photoacoustic activation and ultrasonic activation to reduce filling remnants after root canal retreatment in curved canals

Aim To investigate the effect of Er:YAG laser- initiated shockwave-enhanced emission of photoacoustic streaming (SWEEPS) and passive ultrasonic irrigation (PUI) combining sodium hypochlorite (NaOCl) or thymol-based solvent in the removal of filling remnants from curved canals. Methods Forty-eight curved root canals were instrumented and filled with an epoxy-resin- based sealer and gutta-percha. The canals were retreated with a Wave One Gold primary file (tip size 25 ; variable taper) and NaOCl. After the retreatment, the final irrigation protocol included NaOCl, ethylenediaminetetraacetic acid (EDTA) and saline solution. The samples were, then, randomly divided into four groups according to the additional irrigation protocol: Group 1. PUI/NaOCl ; Group 2. PUI/solvent ; Group 3. SWEEPS/NaOCl and Group 4. SWEEPS/solvent. The volume of filling material in root canal was measured after root canal filling, after mechanical retreatment, after final irrigation protocol and after additional irrigation protocol, using micro-CT. The obtained results were analysed using the Kruskal–Wallis test with the post-hoc Mann-Whitney U test and Wilcoxon test. Results In the PUI group, irrigation with the solvent or NaOCl resulted in similar filling reduction (p=0.224). In the SWEEPS group, irrigation with NaOCl resulted in a significantly greater reduction compared to the solvent (p<0.05). The SWEEPS/NaOCl group was more effective than the PUI/NaOCl group (p=0.008). No significant differences were found between PUI/solvent and SWEEPS/solvent group (p>0.05) and PUI/NaOCl and SWEEPS/solvent group (p>0.05). Conclusion An additional irrigation step activating NaOCl and a thymol-based solvent with PUI or SWEEPS removed significantly more filling material remnants after standard root canal retreatment of curved root canals.

root canal retreatment ; filling remnants ; solvent ; activated irrigation ; SWEEPS

Sažeci objavljeni u časopisu Acta stomatologica Croatica

engleski

Effect of novel laser-initiated photoacoustic activation and ultrasonic activation to reduce filling remnants after root canal retreatment in curved canals

Aim To investigate the effect of Er:YAG laser- initiated shockwave-enhanced emission of photoacoustic streaming (SWEEPS) and passive ultrasonic irrigation (PUI) combining sodium hypochlorite (NaOCl) or thymol-based solvent in the removal of filling remnants from curved canals. Methods Forty-eight curved root canals were instrumented and filled with an epoxy-resin- based sealer and gutta-percha. The canals were retreated with a Wave One Gold primary file (tip size 25 ; variable taper) and NaOCl. After the retreatment, the final irrigation protocol included NaOCl, ethylenediaminetetraacetic acid (EDTA) and saline solution. The samples were, then, randomly divided into four groups according to the additional irrigation protocol: Group 1. PUI/NaOCl ; Group 2. PUI/solvent ; Group 3. SWEEPS/NaOCl and Group 4. SWEEPS/solvent. The volume of filling material in root canal was measured after root canal filling, after mechanical retreatment, after final irrigation protocol and after additional irrigation protocol, using micro-CT. The obtained results were analysed using the Kruskal–Wallis test with the post-hoc Mann-Whitney U test and Wilcoxon test. Results In the PUI group, irrigation with the solvent or NaOCl resulted in similar filling reduction (p=0.224). In the SWEEPS group, irrigation with NaOCl resulted in a significantly greater reduction compared to the solvent (p<0.05). The SWEEPS/NaOCl group was more effective than the PUI/NaOCl group (p=0.008). No significant differences were found between PUI/solvent and SWEEPS/solvent group (p>0.05) and PUI/NaOCl and SWEEPS/solvent group (p>0.05). Conclusion An additional irrigation step activating NaOCl and a thymol-based solvent with PUI or SWEEPS removed significantly more filling material remnants after standard root canal retreatment of curved root canals.

root canal retreatment ; filling remnants ; solvent ; activated irrigation ; SWEEPS

Sažeci objavljeni u časopisu Acta stomatologica Croatica