2. Mechanical properties: high hardness, high strength, good wear resistance, high tensile strength and difficult deformation; The hardness is too high (its hardness is 9 times that of enamel) and the tensile strength is very high. The elongation or deformation before failure is less than 65438 0% of the total volume, while the metal bracket is more than 20%, which ensures that it will not be deformed under the complex chewing movement of the oral cavity and the complete transmission of the orthodontic mechanical system.
3. Ceramic brackets have very good chemical stability and usually do not change color.
4. It has good biocompatibility. Ordinary ceramic brackets do not contain any metal components and are suitable for patients who are allergic to metals.
5. It can be reused. 1. Too high hardness will lead to the rapid wear of tooth enamel when it comes into contact with ceramic brackets;
2. Ceramic brackets lack grain boundaries, which can not inhibit the development of cracks when subjected to external forces, so they are brittle and have low fracture toughness, and are easy to crack when used;
3. The friction resistance of ceramic brackets to archwire is obviously higher than that of metal brackets, which will undoubtedly prolong the treatment time. In order to reduce the friction resistance of arch wire, ceramic brackets with metal or plastic grooves on the surface appeared.
4. Compared with traditional brackets, it is more expensive, but the price is lower than that of invisible appliances without brackets;
5. It is usually larger than the metal bracket; Web page link