Intro to ceramics
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Created by:
Cameron_Foulk on July 20, 2011
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14 terms
Terms | Definitions |
|---|---|
 Dental ceramics | Many chemical constituents. Often based on SiO2 |
| Dental porcelain | traditionally have glass and more ordered elements. |
| Use of ceramics | Denture teeth, Crowns, PFM, inlays, onlays, laminates |
| Silica Structure | Tetrahedral |
| Structure of soda glass | Na2O-SiO2. Sodium disrupts the silica crystal. Metal oxides lower melting range and decrease viscosity. Make it glossy |
| Properties of ceramic material | high compressive strength but low tensile strength |
| Strengthening Brittle materials | Interrupt crack propagation. Introduce residual stress on surface. Add high-fusion tough particles. Expansion of mismatch of layers. Resin-bonded cementation |
| Transmission of stress through ceramic | isotropically |
| Surface flaws | Smoother surface gives increased strength because stresses don't concentrate. Glazes and polishes |
| APF | Contraindicated in ceramics because of low pH. acidulated phosphate fluoride. |
| Devitrification | Turning porcelain opaque after multiple firings. Vitreous (amorphous) portions crystallize |
| Design considerations for ceramics | Minimize tensile stress (contraindicated on posterior teeth without metal) and stress concentrations (thick enough and rounded). |
| Advantages and disadvantages | Advantages: Esthetics, high compressive strength, chemical durability, biocompatible, stain resistant. Disadvantages: Brittle, low tensile strength, high hardness. |
| Porcelain laminates | Thin veneers that are bonded to acid etched enamel with resin cement. Fragile until bonded, expensive, may abrade opposing teeth. |
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