Suspicion: nickel-chrome porcelain teeth can cause kidney disease? Recently, a “nickel-chromium porcelain teeth can lead to kidney disease” post circulated in the major websites and attracted countless followers, the poster said he installed two nickel-chromium porcelain teeth, cough for half a year, allergic purpura, urticaria, laryngitis and other previously unavailable symptoms, and urine test of heavy metals exceeded the standard, was initially diagnosed with cryptogenic nephritis and provided extensive papers on the causal relationship that exists between nickel-chrome porcelain teeth and kidney disease. “We are very concerned about this incident, in any case, the occurrence of this incident is a good thing for the restorative dentistry industry, which shows that patients’ awareness of oral hygiene has increased and helps to promote oral healthcare services in China.” As the chairman of the Prosthodontics Committee of the Chinese Stomatological Association, Feng Hailan, director of the Prosthodontics Department of Peking University School of Stomatology, said about the “nickel-chromium porcelain teeth fiasco”. In order to obtain a wider range of samples, Feng Hailan recently conducted an urgent investigation into the use of nickel-chromium porcelain teeth in the restorative department of Sichuan University West China Stomatological Hospital, the Fourth Military Medical University Stomatological Hospital and other eight dental hospitals in the country’s greater influence. “Preliminary statistics show that since the end of the 1970s, China’s introduction of nickel-chromium baked porcelain teeth, the above eight units made a total of about 900,000 units of nickel-chromium alloy baked porcelain crowns, which may cause allergic reactions only five cases, in addition to not seen to lead to nephropathy – face a detailed examination, please nephrology, toxicology, internal medicine, nutrition, occupational disease and other Experts in the field of nephrology, toxicology, internal medicine, nutrition, occupational diseases and other aspects of the consultation, so as to draw scientific conclusions on their own pathology. Doubt two: the installation of nickel-chrome porcelain tiger patients have no need to remove? Nickel-chromium porcelain teeth since the storm, many people have run to the dental hospital to request the removal of the original set of nickel-chromium porcelain teeth, in recent days, the North Stomatological word almost every day to receive such patients. In this regard, Feng Hailan said, current research shows that nickel-chromium alloy is still a safe dental materials, patients do not need to panic, do not blindly remove, so as not to cause physical harm and economic loss. If there are physical symptoms of abnormalities, you should go to the hospital to determine the final cause of the disease before making a decision. “Patients who are allergic to nickel-chromium porcelain teeth will have a reaction within a relatively short period of time after veneering, mainly symptoms such as skin irritation and perioral inflammation; if there are no such symptoms for a few years, there is no further risk of sensitization.” Feng Hailan said. Zhao Xinyi, chairman of the Oral Materials Specialized Committee of the Chinese Dental Association, pointed out that for the vast majority of patients using nickel-chromium porcelain teeth, nickel-chromium alloy has a good biological safety, only for a very small number of patients there will be some side effects, the main reason for the side effects is nickel ions released by the nickel-chromium alloy. Most of the nickel released from nickel-chrome porcelain teeth will be swallowed into the digestive tract and will not gather in the mouth, and the amount of nickel released from nickel-chrome alloys is significantly lower than the amount of nickel ingested in people’s diets, in spite of how a small amount of nickel is still absorbed into the human body, and the amount of nickel in patients’ blood, saliva, and urine, although it will increase over a certain period of time when patients are wearing nickel-chrome porcelain teeth, is generally within a safe range and will not be harmful to the human body. “In fact, a large number of supplies in our real life, such as pots and pans, contain nickel, and medical devices contain nickel, which is an essential element and has many beneficial effects on human health.” Xu Jun, deputy director of the Peking University School of Stomatology restoration department, said. The World Health Organization pointed out that a rough estimate of the daily intake of nickel for 100 to 600 micrograms. Under normal circumstances into the human body contains about 10 milligrams of nickel. Peking University School of Stomatology, director of the Oral Materials Research Office Zheng Gang said, nickel can be metabolized through the discharge, worried about his installation of nickel-chromium porcelain teeth due to kidney disease netizens in the urine test, was detected nickel content exceeded the normal value of 10 times proved this, but where this nickel is not yet certain. Doubt three: whether the use of nickel-chromium porcelain teeth should be banned in the country? “Nickel-chromium porcelain teeth disease” storm occurred, some media reports that nickel-chromium alloy has been banned in Western countries, proposed that our country should also ban the use of such products, and by the precious metal porcelain teeth and so on to replace it. In this regard, Zhao Xinyi pointed out that the media reported that the western ban and nickel-chromium alloy is not a fact, at present, some western countries are still in the field of oral use of this material, such as Japan’s national standards in 2005, nickel-chromium alloy is still included in the clinical alloy materials can be included in the whole disk and included in the national insurance program, paid for by the insurance company; the U.S. Food and Drug Administration in 2004, issued by the management of the nickel-chromium alloy, the document. also lists nickel-chromium alloys as clinically available dental alloys and does not prohibit and. Why not ban nickel-containing alloys when it is clear that nickel has a certain degree of allergenicity? Zheng Gang said, this is mainly for the following reasons: First, very few people are allergic to nickel, and generally are skin contact allergies, such as watch chains, necklaces, etc., due to contact with the oral cavity and allergies caused by the situation is very rare; Second, nickel-chromium alloys have good mechanical properties and corrosion resistance, used in oral restorations have a very good operating performance, in these areas, in addition to precious metals, it can be said that nickel-chromium alloys are the best choice; Third, the price is cheap and cheap, used for dental restorations with excellent operating performance. the best choice; thirdly, it is inexpensive and can enable more people to obtain more satisfying dental restorations. “Some one-sided conclusions should be prevented from misleading patients to choose all precious metal porcelain teeth, which is not in line with the national conditions of our country and the consumption level of our common people.” Wang Xing, president of the Chinese Dental Association, said. Wang Xing said, at present the domestic market application of porcelain teeth mainly includes all-ceramic teeth, precious metal porcelain teeth, nickel-chrome porcelain teeth, etc., and nickel-chrome porcelain teeth occupy almost 80% of the market. At present, the price of precious metal porcelain teeth is three to four times higher than that of nickel-chrome porcelain teeth. “Patients should choose the right products according to their financial ability and requirements for aesthetics, and if they completely abandon nickel-chrome porcelain teeth, the ones who will benefit in the end will be the manufacturers and distributors of medical equipment, and the hospitals and doctors will also benefit, and the only ones who will be damaged will be the common people.” Wang Xing said. He pointed out that nickel-containing materials used in the oral cavity has nearly a hundred years of history, nickel-chromium alloy used in the production of porcelain teeth also has a history of more than 30 years, and such materials are not only used for porcelain tooth repair in the oral treatment of the application of a lot of oral restorative materials are more mature. Doubt four: how to prevent the risk of porcelain dental inlay? Multiple experts argued that the nickel-chromium alloy oral materials are safe for humans, but Wang Xing also emphasized that the safety of nickel-chromium porcelain teeth have a premise, that is, the use of qualified nickel-chromium alloy materials, processing and production specifications in line with the standard, this principle also applies to other oral materials. The reporter understands that, at present, there is a cause of incorrect manufacturers in the domestic market in order to save costs and production does not meet the quality requirements of the porcelain teeth, or some irregular medical institutions to order the use of the quality of the porcelain teeth is not suitable for the patient inlaid with ceramic teeth brings risk. In this regard, Wang Xing pointed out that to ensure the safety of porcelain teeth and other oral materials, medical institutions must be in accordance with the relevant provisions of the use of qualified products of formal enterprises, the purchase of products must check the enterprise’s product registration certificate, production license and business license or else can not enter the goods. At the same time, medical institutions should strictly comply with the clinical guidelines and operational standards of porcelain tooth repair, oral restoration before asking the patient’s allergy history, inform the product of the risk of allergies. Feng Hailan reminded that patients should choose regular medical institutions, and should not accept some unqualified individuals or institutions for cheap treatment. “If you install a nickel-chromium alloy porcelain crown for as little as 50 dollars, you don’t need to identify it as fake. This money is not even enough to buy a piece of raw material, it is unknown what material it actually uses.” In addition, many experts also emphasized that the relevant regulatory authorities should strengthen the supervision of medical device manufacturers and medical institutions, regulate the oral healthcare market, and ensure that the products used in the clinic meet the quality standards and the safety norms of oral diagnosis and treatment.