Department of Orthodontics, Nippon Dental University School of Life Dentistry at Niigata.
Department of Periodontology, Nippon Dental University School of Life Dentistry at Niigata.
Dent Mater J. 2019 Dec 1;38(6):909-920. doi: 10.4012/dmj.2018-293. Epub 2019 Aug 1.
Corrosion of metallic materials in the oral cavity could trigger metal allergy in patients. To clarify the risk elevation of magnetic fields (MFs) exposure on metallic corrosion when combined with fluoride-containing dental care products and indigenous oral bacteria, we investigated electric toothbrush-derived MF-induced corrosion of orthodontic stainless steel (SUS) and nickel titanium (Ni-Ti) wires in the presence of fluoride and oral bacteria, i.e. Streptococcus (S) mutans and S. sanguinis. MFs induced an electric current in the wires under both environments. Oral bacteria corroded SUS wires, and fluoride corroded SUS and Ni-Ti wires as previously reported; however, no additive or synergistic effects of MF exposure on fluoride- and microbiologically-induced metallic corrosion were observed. These results suggest that the MFs from electric toothbrushes do not increase the risk of corrosion of metallic appliances, given that the oral environment of patients is exposed to oral bacteria and fluoride-containing products.
口腔中金属材料的腐蚀可能会引发患者的金属过敏。为了明确在含氟牙科护理产品和口腔固有细菌存在的情况下，磁场（MFs）暴露对金属腐蚀的风险增加，我们研究了电动牙刷产生的磁场诱导正畸不锈钢（SUS）和镍钛（Ni-Ti）丝在氟化物和口腔细菌存在下的腐蚀，即变形链球菌（S）mutans 和 S. sanguinis。在这两种环境下，磁场都会在金属丝中产生电流。口腔细菌会腐蚀 SUS 金属丝，正如之前报道的那样，氟化物会腐蚀 SUS 和 Ni-Ti 金属丝；然而，在微生物和氟化物诱导的金属腐蚀方面，磁场暴露并没有表现出相加或协同作用。这些结果表明，考虑到患者的口腔环境暴露于口腔细菌和含氟产品中，电动牙刷产生的磁场不会增加金属器具腐蚀的风险。
