Ceramics In Restorative Dentistry Question And Answers

Ceramics Important Notes

1. Composition of porcelain

Ceramics Composition of porcelain

2. Feldspar

  • It is the primary constituent of porcelain
  • When melted it forms a crystalline phase called leucite and a glass phase
  • Leucite is the basic glass former

3. Bonding of porcelain to metal Occurs by:

  • Chemical bonding
  • Mechanical bonding

4. Indications of ceramics

  • Aesthetics
  • Large defects or previous restorations
  • Wide Faciolingual defect

5. Contraindication of ceramics

  • Heavy occlusal forces
  • Inability to maintain a dry field
  • Deep subgingival preparations

Ceramics Short Answers

Question 1. Aluminous Porcelain.


Aluminous Porcelain:

  • It is a ceramic consisting of a glass matrix phase and at least 35 alumina
  • Introduced by Mclean and Hughes


The concentration of alumina crystals and glass powder are mixed, pre fritted at 1200°C

Mixture is grounded

Incorporated into the glass matrix


  • Increase strength, toughness, and elasticity


  • Hi-Cream

Question 2. Castable Ceramic/Dicor.


Castable Ceramic:


  • 55% – Tetrasilicic fluoride crystals
  • 45% – Glass Ceramic


  • Marginal fit
  • High strength
  • High surface hardness

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  • Wear resistance

Cavity Preparation For Cast Metal Restorations

Ceramics Viva Voce

  1. Components of CAD/CAM – scanning device, CAD- computer-aided design, CAM – computer-assisted manufacture
  2. Occlusal reduction – 1.5-2 mm
  3. Occlusal divergence – 6-8° per wall
  4. Isthmus width – 1.5 mm
  5. Axial depth of proximal box – 1.5 mm
  6. Cavosurface angle – 90°
  7. The gingival margin of the proximal box should be placed supragingival

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