1. Why is it called zirconium dioxide all-ceramic teeth?
Having a clean and beautiful tooth is the dream of many beauty lovers. Porcelain teeth have long been a quick and effective way to repair teeth, but the metal ions of metal porcelain teeth can have adverse reactions to the human body, such as darkening gums, bleeding, and shrinking gums…
Because of the metal inner crown, the light transmittance, color, and shape are very different from natural teeth and will produce a blue-gray effect under light. At the same time, metal porcelain teeth are unstable under the action of bacteria in a liquid oral acid-alkali environment, and the patient has certain interference with metal during CT MRI.
Therefore, dental labs have been working hard to change this state. At present, the latest porcelain teeth without metal inner crowns are popular in the international oral community – the zirconium dioxide all-ceramic teeth series.
2. Are zirconium dioxide all-ceramic teeth safe?
Zirconia for medical and dental use is excellent in terms of biosafety.
Over the years, a large number of experiments and clinical cases in dental labs have proven that zirconia has no toxic damage to bone and soft tissue cells, and no allergic reactions have been reported.
1. Patients are worried about whether zirconium dioxide all-ceramic teeth are radioactive.
In fact, zircon from zirconium dioxide all-ceramic teeth needs to go through several steps such as purification treatment and powder processing. The processing process will remove all impurities.
The standards of the State Food and Drug Administration have strict standards for all-ceramic materials on the market, and can only be used as medical materials after meeting the requirements of radiological experiments.
Moreover, there are requirements not only for zirconia but also for decorative porcelain, alumina, glass ceramics, etc. Experiments have shown that pure zirconia powder is not only less radioactive than glass ceramics, but even lower than human bone tissue.
2. Zirconia is sometimes mistaken for a type of metal.
This is a chemical concept that confuses metal elements and metals. Zirconia is not zirconium metal or zircon, although it contains metal elements, it is oxide ceramics. This is like the difference between sodium chloride and metallic sodium.
3. Is there a high rate of porcelain disintegration of zirconium dioxide all-ceramic teeth?
Numerous studies by dental labs have shown that the incidence of zirconium dioxide all-porcelain teeth is not higher than that of traditional porcelain restorations. Studies have found that zirconia porcelain collapse occurs mainly inside the porcelain and not at the interface between the porcelain and the zirconia substrate crown.
There are three main reasons for the occurrence of porcelain collapse:
- The shape of the bottom crown is poor, and the porcelain on the local surface is too thick;
- When porcelain is sintered, the temperature is not controlled according to the standard, such as rapid cooling;
- The doctor did not perform the reasonable treatment after adjusting the jaw, such as glazing and sintering, or standard three-step polishing… these are all necessary steps.
4. Does jaw adjustment affect zirconium dioxide all-ceramic teeth? How can I avoid it?
After adjusting the jaw, it will cause damage to the porcelain surface and must be followed up, such as glazing, sintering, or polishing.
However, heavy grinding can greatly affect the strength of the restoration and may cause breakage. If the restoration is improperly made, it is recommended to re-take the precision stamping and rework.
If a small amount of zirconia needs to be ground, it will have less impact on strength when fully cooled.
However, if the polishing area is too large, it will definitely cause a decrease in strength. If you want to polish the inner crown, you need to communicate with the technician.
5. Will total zirconia cause excessive wear on maxillofacial teeth?
For some patients with tight occlusions and insufficient space to prepare teeth, zirconium dioxide all-ceramic teeth are a good choice.
If you’re concerned about excessive wear on your jaw teeth, you don’t have to, because the abrasive properties of zirconia depend on the smoothness of the surface, not the hardness.
Therefore, after polishing or glazing, zirconium dioxide all-ceramic teeth will not cause excessive wear on the jaw teeth. After grinding, please leave it to a technician to glaze or polish yourself.
6. What should I pay attention to in the bonding of zirconium dioxide all-ceramic teeth? How is it different from other all-porcelain?
Zirconia bonding is relatively simple compared to glass-ceramics.
Because of its good strength, the choice of adhesives is very wide. There is no need for surface treatment by a doctor before bonding zirconium dioxide all-ceramic teeth. Its active gene binds to zirconium ions to obtain chemical binding power. Also available in a variety of colors.
7. Characteristics of zirconia crown
- The color is very similar to the color of natural teeth, has a high aesthetic effect, excellent light transmittance, and is more suitable for use in areas with high aesthetic requirements.
- There is no metallic odor in the oral cavity, no corrosion, no stimulation of the pulp nerve due to the alternation of hot and cold, excellent biocompatibility and durability. It can withstand strong bite force, prevent cracking, and is sturdy and durable. Solved the problems of transparent gums, black lines, and discoloration of metal porcelain.
- During the MRI examination, the non-metallic zirconia does not block the X-ray, and the dentures do not need to be removed during the MRI examination, which saves a lot of trouble.
7.2 Requirements for preparing abutment teeth:
- Front teeth: cut end grinding about 2.0 mm, tongue side grinding about 1.5 mm to prepare 360 degrees, shoulder table about 1 mm wide, axial jaw angle of 2 degrees to 5 degrees;
- Rear teeth: maxillofacial abrasions about 2.0 mm (2.0 mm on the working side, 1.5 mm on the non-working side), 1.5 mm for buccal and tongue grinding, 360 degrees, shoulder platform width of about 1.0 mm, axial jaw angle of 2 degrees to 5 degrees;
- Veneer: the key to the preparation and positioning in the enamel part is to have a transition step at the tongue incision, and determine that the edge of the step is not in the wear area of the jaw, the range of cut end preparation is about 1-1.5 mm, the lip surface is about 1.2 to 1.5 mm, and the shoulder table preparation angle of the neck part is about 10-30 degrees.
7.3 Precautions for zirconium dioxide all-ceramic teeth in clinical promotion:
- The base teeth are short and the base teeth are sharp are not suitable.
- Inadequacy of insufficient space (insufficient strength of connection points)
- Single recessed and large bridge body indented cannot be done.
- Doctors are advised to row the gums and use silicone rubber when taking the mold.
Doctors are advised to use 16 colorimetric colors. (In particular, all zirconium must be colorimetric with 16 colors, otherwise, it will cause color difference)