41: Advanced ceramic systems

41

Advanced ceramic systems

Figure 41.1 Schematic representation of a crown constructed with a glass-ceramic (Dicor) core.

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Figure 41.2 Flexural strengths (MPa) of porcelain and castable glasses.

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Figure 41.3 Average flexural strengths (MPa) of porcelains and advanced ceramic systems.

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Table 41.1 Dental ceramics and methods used for restoration fabrication

Fabrication method Crystalline phase
Sintered Alumina
Fluorapatite
Leucite
Hot-pressed Leucite
Lithium disilicate
Lithium phosphate
Slip-cast Alumina
Magnesium–alumina spinel
Zirconia–alumina spinel
Machined Alumina
Feldspathic porcelain
Fluoromica
Leucite
Zirconia (Y-TZP and Ce-TZP)

In recent years, esthetic considerations regarding metal–ceramic systems and questions about their reliability have stimulated a growing trend for all-ceramic restorations (ACRs). Originally ACRs were based on porcelain reinforced with alumina cores and leucite (Chapter 40) but newer, far stronger ceramics containing up to 99 vol.% of a reinforcing crystalline phase are now available (Table 41.1). Techniques such as sintering, hot pressing, slip-casting, and machining are used to fabricate restorations and there is increasing use of high-strength castable cores with the restoration body and incisal region of conventional porcelain for esthetics.

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Jan 1, 2015 | Posted by in Dental Materials | Comments Off on 41: Advanced ceramic systems
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