Specific differences:
1, different raw material sources
The raw materials of zirconium dioxide mainly come from Australia (Iluka, Tiwest), South Africa (RBM) and other countries. China is mainly from Yixing, the capital of porcelain. The total domestic output is nearly 200 tons, which cannot be used to make teeth, and 90% is used to make fake diamonds. After all, this profit is higher than medical care.
2, the quality is different
The porcelain bonding, hardness and water content of imported zirconium dioxide blocks are better than those of domestic ones, but domestic zirconium blocks often appear the phenomenon of color whitening and successive crushing in clinic. There are computer-designed turning and hand-piled, with different materials and different prices. If you want to make a crown with higher strength, it is easy to break porcelain and pull porcelain.
3. The risks are different.
Because imported zirconium dioxide needs to be refined and prepared, its radioactivity is very low and it has no effect on the body. 20 years in the mouth is not as bad as 20 minutes in the sun.
The difference of water content and preparation process of domestic zirconia leads to high brittleness, that is, high brittleness, and the relative lead content is slightly higher than that of imported zirconia.
Extended data:
1970s, the famous VITA company in Germany invented In-Ceram technology, which greatly improved the strength of all-ceramic crowns and quickly applied it to clinic. The realistic aesthetic effect of all-ceramic crowns shocked dentists, and even dentists could hardly tell which one was a false tooth. Nowadays, with the development of material science and computer technology, CAD-CAM technology has been applied to the manufacture of dentures. At present, zirconia computer all-ceramic tooth Cercon has become the most successful product in all-ceramic teeth.
superiority
1. There is no black line on the edge of the gum, no heavy feeling, no redness and bleeding of the gum, which makes you really feel that porcelain teeth grow from your own gums.
2. The light transmission matched with the real teeth is natural in color, and the restoration is integrated with the healthy teeth, which is not easy to distinguish, and there is no longer the embarrassment of "green teeth shining" under the light.
3. The compressive strength is equivalent to that of metal porcelain teeth, so there is no need to worry about cracking of porcelain teeth.
4. Zirconia is an excellent high-tech biomaterial. Good biocompatibility, superior to various metal alloys, including gold. Zirconia has no irritation or allergic reaction to gums, so it is very suitable for oral use, and avoids adverse reactions such as allergy, irritation and corrosion caused by metals in the oral cavity.
5. There are fewer molars, and the tooth tissue is preserved to a great extent.
6. If the denture embedded in your mouth is a metal-containing porcelain crown, it will be affected or even removed when X-ray, CT and MRI of the head are needed. Non-metallic zirconium dioxide does not hinder x-rays As long as zirconia porcelain teeth are buried, it is not necessary to remove dentures when X-ray, CT and MRI are needed in the future, which saves a lot of trouble.
Matters needing attention
1. There is slight discomfort when wearing the crown for the first time, so the patient should practice patiently and adapt gradually;
2. Eat soft when you just wear it, and eat normal when you get used to it. Avoid eating hard food (such as small walnuts);
3. Keep your mouth clean and get into the habit of brushing your teeth after meals (it is recommended to use dental floss and tooth washer, etc. );
4. If the crown is worn to adapt or cause pain, it should be followed up in time;
5. It is recommended to review regularly.
Baidu encyclopedia-zirconia all-ceramic teeth