1. Structure of oral ceramic materials
(1) Crystal phase: It is the main constituent phase of ceramic materials.
(2) Glass phase: It is a low melting point solid with an amorphous structure that exists between various grains, bonding grains, improving the density of ceramic materials, reducing sintering temperature, improving process, and suppressing grain growth. The chemical composition of glass phase is mostly SiO2, and the content of glass phase varies for different ceramics.
(3) Gas phase: also known as pores, most pores are formed and retained during the processing. Some pores can be obtained through special process methods, generally including open pores and closed pores. The porosity, pore size, and morphology distribution have a significant impact on the performance of ceramics. Reasonable control of the number, morphology, and distribution of stomata is extremely important.
2. Performance of oral ceramic materials
(1) Physical performance; Oral ceramic materials are thermal insulators with a thermal expansion coefficient similar to human teeth. The main reason for affecting transparency is the presence of pores inside the ceramic. The finer the particles of ceramic powder, the smaller and denser the pores.
(2) Chemical properties: The chemical properties of oral ceramics are stable in oral materials.
(3) Biological properties: Oral ceramic materials have good biological properties.
(4) Aesthetic performance: Oral ceramic materials have good aesthetic performance.
