Dental Ceramic And Its Advancements

Dental Ceramic And Its Advancements

Write a short note on recent advances in ceramics.
Answer:

Following are the recent advances in ceramics:

• Magnesia core
• Alumina-reinforced ceramic (Hi-Ceram)
• Castable ceramics.
• Ceramic nanopowders.

Alumina Reinforced Ceramic (Hi-Ceram):

This is based on the dispersion strengthening of ceramic. Alumina crystals are dispersed uniformly in a glass matrix to increase the strength, toughness, and elasticity of the material. In the case of aluminous ceramic, the concentration of alumina crystals and glass powder are mixed and prefritted at 1200°C. Then this crystal glass is grounded and incorporated in a glass matrix, for example, Hi-cream.

Ceramic Nanopowders:

• Nanotechnology in dental ceramics leads to the preparation of nanopowders from zirconia, alumina, and ceria.
• Ceramic blocks prepared from these nanopowders have smooth surfaces which is reduced to porosities and internal defects.
• They have high flexural strength.
• As the size of nanoparticles is below the wavelength of light, they allow light to pass via material resulting in bettr optical properties.