Classification Of Dental Ceramics

Classification Of Dental Ceramics

Write a short note on the classification of dental ceramics.
Or
Write brief on the composition of dental ceramics.
Or
Write a short note on the composition of dental ceramics.
Answer:

Dental ceramics are far stronger, wear-resistant, and virtually indestructible in the oral environment.

Classification of Dental Ceramic:

1. According to Firing Temperature:
   • High-fusing: 1300° for denture teeth
   • Medium-fusing: 1001° to 1300°C for denture teeth
   • Low-fusing: 850° to 1100°C for denture teeth.
   • Ultra-low-fusing: Less than 850°C used with titanium.
2. According to Type:
   • Feldspathic porcelains
   • Leucite-reinforced glass ceramics
   • Tetrasilicic flormica based glass ceramics
   • Lithia disilicate-based ceramics
   • Alumina-reinforced ceramics
   • Spinel-reinforced ceramics
   • Zirconia-reinforced ceramics.
3. According to its Function within the Restoration:
   • Core ceramics: Supports and reinforces restoration
   • Opaque ceramics: Mask or hide the metal.
   • Veneering ceramics:
     • Body or dentine: Simulates the dentine portion of natural teeth
     • Incisal: Simulates the enamel portion of natural teeth
     • Gingival: Simulates darker gingival portion of teeth
     • Translucent: Simulates translucent incisal enamel seen sometimes in natural teeth
     • Stains: Colored ceramic improves esthetics
     • Glaze: Imparts smooth glossy surface to the restoration.
4. According to Microstructure:
   • Glass-ceramics
   • Crystalline ceramics
   • Crystal-containing glasses.
5. According to the Fabrication Process:
   • Condensable ceramics
   • Slip-cast glass-infiltrated ceramics
   • Heat-pressed ceramics
   • Castable ceramics
   • Machinable ceramics
   • Various combinations of the above.