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Effect of antimicrobial photodynamic therapy (aPDT) on the sterilization of infected dentin in vitro

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Abstract

The aim of this study was to evaluate the bactericidal effect of antimicrobial photodynamic therapy (aPDT) on an infected dentin model. Dentin plates were prepared from extracted human molars and infected through immersion in a solution of Streptococcus mutans. The nine experimental groups consisted of two laser irradiation groups (650 nm laser: 650 laser and 940 nm laser: 940 laser), two photosensitizer groups (methylene blue: MB, and azulenocyanine: Azc), four aPDT groups (650 nm laser irradiation of MB: 650 laser-MB, 650 nm laser irradiation of Azc: 650 laser-Azc, 940 nm laser irradiation of MB: 940 laser-MB and 940 nm laser irradiation of Azc: 940 laser-Azc) and a control. The bactericidal effects on each group were evaluated by colony count and adenosine triphosphate (ATP) assays. Based on the results of the colony count assay, the 650 laser-MB and 940 laser-MB groups formed significantly fewer colonies than the other experimental groups. Significantly fewer colonies were observed in the 940 laser-Azc group than in the control, but significant differences in the numbers of colonies were not observed between the 650 laser-Azc and control groups. The 940 laser group formed slightly fewer colonies than the 650 laser group, but the difference was not significant. In addition, the number of colonies in the MB group was significantly less than the number in the Azc group. The results of the ATP assay were similar to those of the colony count assay. aPDT with MB showed a significant bactericidal effect on dentin plates infected with S. mutans.

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Acknowledgements

We would like to deeply thank the National Research and Development Institute (RIKEN) for providing azulenocyanine.

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Authors and Affiliations

  1. Advanced Operative Dentistry-Endodontics, The Nippon Dental University Graduate School of Life Dentistry at Niigata, Niigata, Japan

    Yuta Nagai

  2. Department of Microbiology, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan

    Anri Suzuki & Hiroaki Katsuragi

  3. Department of Operative Dentistry, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan

    Koichi Shinkai

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  1. Yuta Nagai
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Correspondence to Koichi Shinkai.

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Nagai, Y., Suzuki, A., Katsuragi, H. et al. Effect of antimicrobial photodynamic therapy (aPDT) on the sterilization of infected dentin in vitro. Odontology 106, 154–161 (2018). https://doi.org/10.1007/s10266-017-0321-6

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