Do zirconia crowns last long?
2022 07/26
The study found that the survival rate of zirconia restorations was 95.3% after 1 year and 80.2% after 2 years, the best results among known materials. The main reason for the failure of zirconia repair clinically is the cracking of the decorative porcelain. Although porcelain veneer has a better aesthetic effect, the probability of Machinable Glass Ceramic Block porcelain chipping is higher in zirconia-based porcelain veneer restorations (6%-25% after three years), which is higher than that of glass all-ceramic restorations or metal-porcelain restorations . Mismatches in fracture toughness, flexural strength, coefficient of thermal expansion, and modulus of elasticity, etc., can affect the combination of decorative porcelain and zirconia. With the development of materials, new types of high-permeability all-zirconium restorations continue to appear, improving the transparency of zirconia materials. For example, PRETTAU ANTERIOR (Zirkonzahn) was launched in 2014, which has the same light transmittance as lithium disilicate glass ceramics, and Machinable Glass Ceramic Plate its strength is much higher than that of glass ceramics (>670MPa), which can largely replace glass ceramics as the aesthetic restoration of anterior teeth. . [9] Compared with the traditional zirconia coping and veneer porcelain, the full zirconium restoration has a smaller amount of tooth preparation, retains more tooth tissue, and avoids the restoration failure caused by the broken porcelain, which further improves the restoration success. Rate. Zirconia post-core crown zirconia ceramic material has good biocompatibility and opacity, as well as good elasticity and hardness. The metal material has good stability and mechanical strength, but is easy to break, corrode, and has artifacts in clinical MRI. Using zirconia post and core for restoration, the long-term effect of tooth integrity, color, etc. is better, and the post-core crown damage after restoration is less. Fiber post and core are translucent, have good corrosion resistance, and are very similar to autologous teeth. In recent years, they are often used in anterior teeth restoration. When a large area of tooth defect occurs, the occlusal force is required to be high, so that the unique metal-mechanical advantages of zirconium dioxide post and core are reflected. Some studies have found that zirconia post and Machinable Glass Ceramic Bar core crowns are superior to fiber post resin cores in repairing large-area tooth defects. For small-area defects with low occlusal strength, such as maxillary anterior teeth, the fiber post resin core can be selected. Zirconia abutments have lower surface free energy and surface wettability compared to metals, thus weakening bacterial adhesion and reducing the risk of peri-implant disease. [1] Zirconia abutments are more in line with the aesthetic requirements of patients and have better biocompatibility. Titanium and metal abutments may be exposed through the peri-implant soft tissue, resulting in graying of the marginal tissue and poor esthetics.