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Effects of Removal Conditions on Mercury Amount Remaining in the Oral Cavity and inside Drainage System after Removing Dental Amalgams

Author

Listed:
  • Yoshiki Ishida

    (Department of Dental Materials Science, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo 102-8159, Japan)

  • Harumi Aoki

    (Department of Dental Materials Science, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo 102-8159, Japan)

  • Taira Miyasaka

    (Department of Dental Materials Science, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo 102-8159, Japan)

  • Yusuke Aoyagi

    (Department of Dental Materials Science, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo 102-8159, Japan)

  • Daisuke Miura

    (Department of Dental Materials Science, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo 102-8159, Japan)

  • Akikazu Shinya

    (Department of Dental Materials Science, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo 102-8159, Japan
    Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku, 20520 Turku, Finland)

Abstract

Mercury is produced and drained into the environment by removing dental amalgams, which may cause mercury pollution. This study aimed to clarify the mercury amount remaining in the oral cavity and inside the drain system after removal. The effects of the removal conditions and differences in drainage systems were also investigated. Dental amalgams filled in the tooth and placed in a phantom head were removed using an air turbine under several conditions (two removal methods, absence of cooling water, and intraoral suction). Then, the oral cavity was rinsed with 100 mL of water (oral rinse water), and 500 mL of water was suctioned to wash the inside of the drainage system (system rinse water). Both water samples were collected in two ways (amalgam separator and gas-liquid separator), and their mercury amounts were measured. It was found that the amount of mercury left in the oral cavity and drainage system after dental amalgams removal could be reduced when the amalgams were removed by being cut into fragments as well as using cooling water and intraoral suction. In addition, using amalgam separators can significantly reduce the amount of mercury in the discharge water and prevent the draining of mercury into the environment.

Suggested Citation

  • Yoshiki Ishida & Harumi Aoki & Taira Miyasaka & Yusuke Aoyagi & Daisuke Miura & Akikazu Shinya, 2021. "Effects of Removal Conditions on Mercury Amount Remaining in the Oral Cavity and inside Drainage System after Removing Dental Amalgams," IJERPH, MDPI, vol. 18(24), pages 1-11, December.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:24:p:13135-:d:701044
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    References listed on IDEAS

    as
    1. Hector Jirau-Colón & Leonardo González-Parrilla & Jorge Martinez-Jiménez & Waldemar Adam & Braulio Jiménez-Velez, 2019. "Rethinking the Dental Amalgam Dilemma: An Integrated Toxicological Approach," IJERPH, MDPI, vol. 16(6), pages 1-13, March.
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