① Zirconia dioxide dental crowns closely resemble the color of natural teeth, providing a highly aesthetic result with excellent translucency. They are particularly suitable for areas with high aesthetic requirements.

② Zirconia dioxide crowns do not have a metallic odor in the oral cavity. They are non-corrosive, do not stimulate the dental pulp due to temperature changes, and exhibit outstanding biocompatibility. They are durable and can withstand high biting forces, preventing fracture and ensuring long-lasting strength. They also address issues associated with metal porcelain crowns such as gum discoloration, visible metal lines, and discoloration over time.

③ During magnetic resonance imaging (MRI), non-metallic zirconia dioxide does not cause any interference with X-rays. This eliminates the need to remove the dental crowns during MRI examinations, saving a lot of trouble.

Zirconia ceramic teeth can be used for cosmetic purposes and to address various dental conditions such as severe tetracycline staining, fluorosis, dental deformities, and discolored teeth. They are also suitable for individuals who are allergic to metal or plastic. Zirconia ceramic teeth can be used for single crowns on both anterior (front) and posterior (back) teeth, as well as for bridge restorations.

① Cases of teeth grinding at night

② Cases with insufficient space for tooth preparation

③ Cases involving dental implants

④ Other cases prone to porcelain fracture, etc.

Having a set of clean and beautiful teeth is one of the top ten health indicators for modern individuals. It is also a representation of a high-quality lifestyle and a symbol of status. For a long time, porcelain-fused-to-metal (PFM) crowns have been a fast and effective method for restoring teeth. However, the presence of metal ions in PFM crowns can cause adverse reactions in the body, such as gum darkening, gum recession, and more.

Additionally, due to the presence of metal substructures in PFM crowns, there are significant differences in translucency, color, and shape compared to natural teeth. This can result in a bluish-gray appearance under certain lighting conditions.

Moreover, metal-ceramic crowns are unstable in the acidic and alkaline environment of the oral cavity and can be affected by bacterial action. When patients undergo CT scans or magnetic resonance imaging (MRI), the presence of metal can cause interference. Therefore, the dental field has been striving to change this situation, and currently, the latest trend in the international dental community is the use of zirconia all-ceramic crowns, which are free from metal substructures.

In recent years, numerous experiments and clinical studies have demonstrated that zirconia is non-toxic to bone and soft tissue cells, and no reports of allergic reactions have been observed among users. Moreover, zirconia exhibits excellent biocompatibility in medical and dental applications.

1. Many patients often worry about whether zirconia has radioactivity. 

In fact, zirconia is derived from zirconium minerals and undergoes purification and powder processing to remove all impurities. The processing of zirconia follows strict standards set by the National Medical Products Administration, including radiation testing, before it can be used as a medical material. This radiation qualification requirement applies not only to zirconia but also to porcelain, alumina, glass ceramics, and other materials.

Experimental studies have also demonstrated that pure zirconia powder has lower radioactivity compared to glass ceramics, and even lower than human bone tissue.

2. Zirconia is sometimes mistakenly considered as a type of metal. 

This confusion arises from mixing up the concepts of metallic elements and the chemistry of metals. Zirconia is not metallic zirconium or zirconium dioxide; although it contains metallic elements, it is an oxide ceramic. It is similar to the distinction between sodium chloride (the chemical composition of table salt) and metallic sodium.

For patients with tight occlusion and insufficient tooth preparation space, zirconia all-ceramic restorations are a good choice. If you are concerned about excessive wear on your teeth, there is no need to worry! The wear resistance of zirconia depends on the smoothness of the surface, not its hardness.

The bonding process for zirconia is relatively simple compared to glass ceramics. Due to its strong bonding capabilities, there is a wide range of adhesive options available. No surface treatment is required before bonding. Its active groups can chemically bond with zirconium ions, providing excellent chemical bonding strength. Additionally, there are multiple color options to choose from.

1. Anterior teeth: Incisal reduction of approximately 2.0 millimeters, lingual reduction of approximately 1.5 millimeters with a 360-degree preparation, a shoulder width of approximately 1 millimeter, and an axial inclination of 2 to 5 degrees.

2. Posterior Teeth: Approximately 2.0 millimeters of occlusal reduction (2.0 millimeters on the working side and approximately 1.5 millimeters on the non-working side), 1.5 millimeters of buccal and lingual reduction with a 360-degree preparation, and a shoulder width of approximately 1.0 millimeter. The axial inclination should be 2 to 5 degrees.

3. Veneers: The key to preparation is to create a transitional step at the lingual incisal edge, ensuring that the edge is not in the area of occlusal wear. The incisal edge preparation range is approximately 1 to 1.5 millimeters, the labial surface is approximately 1.2 to 1.5 millimeters, and the shoulder preparation angle at the cervical portion is approximately 10 to 30 degrees.

Considerations for the clinical promotion of zirconia dioxide include:

1. Unsuitable for short or sharp abutment teeth.

2. Not recommended for cases with limited space or insufficient connector strength.

3. Inappropriate for single concave or large bridge concave cases.

4. It is advised for the dentist to capture the gum line and use silicone rubber for impressions.

Dentists are recommended to use a 16-shade guide for color matching, especially for full-zirconia restorations, to avoid color discrepancies.