There are metal crowns (big gold teeth, titanium alloy teeth ...), porcelain crowns (metal inside and porcelain on the surface), all-ceramic teeth (mainly alumina and zirconia), precious metal porcelain crowns of Beijing Stomatological Hospital 2700(2000+ is affirmative, impression 2700 is uncertain), and the price of all-ceramic zirconia crowns is 5000+.
From the doctor's point of view, all-ceramic zirconia crown is superior to others, so the problem comes. For geology and mineral resources, there is a mature and commonly used dating method in the geological industry, which is zircon, uranium and lead dating. Zircon contains high content of uranium and lead and is highly radioactive. On-site consultation with the doctor, whether zirconia (zirconium dioxide) will have strong radiation, Dr. Li probably means that such a small amount will not affect ... er, lovely doctor of medicine, you are a liberal arts student, and a small amount of radioactive substances can cause serious harm to a large number of people. Director Cheng Wei said: Medical materials have been strictly demonstrated ... and they are really old and spicy. I trusted Dr. Cheng and chose zirconia all-ceramic teeth.
Considering that radiation is colorless and tasteless, it is invisible and intangible, which is harmful to people. Check the information about zirconium dioxide when you come back. There are not many articles demonstrating the radioactivity of zirconia all-ceramic teeth in domestic literature, only a master's thesis by Fan Tianhui of the Fourth Military Medical University and a paper published by her in journal of clinical stomatology, which are respectively entitled "Biological Safety and Radioactive Element Research of RF Zirconia All-ceramic Materials" and "Radioactive Element Research of Domestic RF Zirconia All-ceramic Materials". Regarding the radioactivity of zirconia all-ceramic teeth, the conclusions of the two articles are the same. Trace elements were measured by ICP-MS technology. The mass of the main radioactive substance U+Th/ main elements in BF zirconia (made in China and produced by Shenzhen Jinyouran Company) is about (0.52+0.63)/(15744+41912+566278). However, when discussing the safety of radioactive material content in zirconia ceramic teeth, the author compared the content with the national standard of building materials and bathroom tiles. Personally, he thinks that teeth wear when chewing food, and trace substances will enter the digestive system. The standards for comparing the contents of radioactive substances in building materials are not strict.
The contents of radioactive substances in food were compared with those in zirconia all-ceramic teeth. Liu Yaqiong published a paper entitled Determination of Thorium and Uranium in Food in China by Inductively Coupled Plasma Mass Spectrometry in 2003. The contents of uranium and thorium in NISTSRM 1584 were 2.0 0.3 ng/g and1.6 0.3 ng/g respectively, and the mass ratio of U+Th was calculated. The mass/material mass of uranium+thorium in grain is about 7.8× 10-7 by the same method.
However, the article "Determination of Natural Uranium and Thorium in Food and Estimation of Effective Dose for Human Body" published by Kong Linghai et al. in No.2016 of Environmental and Occupational Medicine shows that the uranium content in grain is1.86×10-6g. The thorium content is 1.89× 10-6g/kg, which is about 1.89× 10-9 when converted into Th mass/substance mass. The mass of U+Th/ material is 3.75× 10-9.
If the data in the above article are reliable, the radioactive substance content of zirconia ceramic teeth is about 0.26~53 times that of grain and 55.6 times that of the total dietary standard substance of NISTSRM 1584 in the United States. The content of radioactive substances in BF zirconia ceramic teeth is basically in an order of magnitude with food, and it can be basically concluded that it will not cause obvious radiation damage to human body. Foreign zirconia materials such as e.max (made in Switzerland) and VITAin-Ceram (made in Germany) have low radioactive substances.
Question: 1, domestic RF type, e.max (made in Switzerland) and VITAin-Ceram (made in Germany) are only from the same researcher, and there is no data from other researchers for comparison and verification; 2, personal non-medical and material science majors, the understanding of radioactive substances may be one-sided, especially simply comparing the content of radioactive elements, without considering the specific activity of radioactive elements, whether it is rigorous.
Personal opinion on dental restoration. During periodontal treatment, the doctor said that the fillings at the edge of teeth (between two teeth) are easy to fall off. If there is a small hole in the middle of a tooth, it will take a long time to mend it. Then I personally think: 1, the early stage of dental caries, or can be treated with drugs without mechanical damage to teeth or remineralization of decayed tissue. 2. The back teeth (which do not affect the appearance and the food in the cavity is not serious) are decayed. If the edge of the tooth falls off, it is not recommended to fill the tooth when the toothache is painless or tolerable, because the hole will become bigger and bigger when filling the tooth, and the edge will easily fall off after filling. Repeatedly, dentin will be penetrated, and only pulp (incisor nerve) can be pulled out for root canal. 3. If there is a hole in the middle of the tooth and the filling material lasts for a long time, I have no similar experience and decide for myself. Generally speaking, after the crown is completed, the strength and comfort of the teeth are not as good as the original teeth (the doctor also said so), so it should be carefully considered when deciding to pull out the pulp and kill the teeth. This process is irreversible.
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