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<p>To compare the effect of laser and other four traditional root canal disinfection methods on the removal of microorganisms in the root canal of refractory periapical periodontitis. 155 single-canal premolars were made into 13 mm long standard roots, infected with E. faecalis and C. albicans, randomly divided into five groups, and treated with A: lateral syringe irrigation group; B: ultrasonic irrigation group; C: sonic irrigation group; D: Er∶ YAG laser in SWEEPS mode group; E: photodynamic therapy group for root canal irrigation. Root canal samples were collected with 25# K files before and after irrigation. The irrigation effectiveness was quantitatively analyzed by flat colony counting method and observed by scanning electron microscope and confocal laser scanning electron microscope. The Er∶ YAG laser group had the highest clearance efficiency for E. faecalis (P &lt; 0.05), and the ultrasonic irrigation effect was lower than that of Er∶ YAG laser (P &lt; 0.05), while there was no difference between that of sonic irrigation group, photodynamic therapy group and lateral syringe irrigation group (P &gt; 0.05). These five methods were all able to clear C. albicans well without significant difference (P &gt; 0.05). SEM and confocal laser SEM showed that Er∶ YAG laser groups were more effective at removing smear layers and total bacteria. The performance of Er∶ YAG laser eliminating E. faecalis and C. albicans and the smear layer was found superior in the root canal of refractory apical periodontitis. It is recommended to employ Er∶ YAG laser for subsequent root canal decontamination following root canal preparation. Clinical trial number: Not applicable.</p>

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Comparison of Laser and Conventional Root Canal Disinfection Protocols in an dual-biofilm in-vitro model

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月27日

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  • Jingyi Wang,
  • Wenxu Li,
  • Wanxin Lan,
  • Ling Ye,
  • Bo Gao

摘要

To compare the effect of laser and other four traditional root canal disinfection methods on the removal of microorganisms in the root canal of refractory periapical periodontitis. 155 single-canal premolars were made into 13 mm long standard roots, infected with E. faecalis and C. albicans, randomly divided into five groups, and treated with A: lateral syringe irrigation group; B: ultrasonic irrigation group; C: sonic irrigation group; D: Er∶ YAG laser in SWEEPS mode group; E: photodynamic therapy group for root canal irrigation. Root canal samples were collected with 25# K files before and after irrigation. The irrigation effectiveness was quantitatively analyzed by flat colony counting method and observed by scanning electron microscope and confocal laser scanning electron microscope. The Er∶ YAG laser group had the highest clearance efficiency for E. faecalis (P < 0.05), and the ultrasonic irrigation effect was lower than that of Er∶ YAG laser (P < 0.05), while there was no difference between that of sonic irrigation group, photodynamic therapy group and lateral syringe irrigation group (P > 0.05). These five methods were all able to clear C. albicans well without significant difference (P > 0.05). SEM and confocal laser SEM showed that Er∶ YAG laser groups were more effective at removing smear layers and total bacteria. The performance of Er∶ YAG laser eliminating E. faecalis and C. albicans and the smear layer was found superior in the root canal of refractory apical periodontitis. It is recommended to employ Er∶ YAG laser for subsequent root canal decontamination following root canal preparation. Clinical trial number: Not applicable.