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.
Int J Environ Res Public Health. 2021 Dec 13;18(24):13135. doi: 10.3390/ijerph182413135.
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.
汞通过去除牙汞合金而产生并排放到环境中，这可能会导致汞污染。本研究旨在阐明去除牙汞合金后口腔内和排水系统内残留的汞量，以及去除条件和排水系统差异的影响。使用空气涡轮机在几种条件下（两种去除方法、没有冷却水和口腔内抽吸）去除填充在牙齿中的牙汞合金并放置在人体模型头部中。然后，用 100 毫升水（口腔冲洗水）冲洗口腔，并抽吸 500 毫升水清洗排水系统内部（系统冲洗水）。这两种水样都以两种方式（汞合金分离器和气液分离器）收集，并测量其汞含量。研究发现，当牙汞合金被切成碎片并使用冷却水和口腔内抽吸去除时，去除牙汞合金后口腔和排水系统中残留的汞量可以减少。此外，使用汞合金分离器可以显著减少排放水中的汞含量，防止汞排入环境。
