41: Advanced ceramic systems


Advanced ceramic systems

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


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


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


Table 41.1 Dental ceramics and methods used for restoration fabrication

Fabrication method Crystalline phase
Sintered Alumina
Hot-pressed Leucite
Lithium disilicate
Lithium phosphate
Slip-cast Alumina
Magnesium–alumina spinel
Zirconia–alumina spinel
Machined Alumina
Feldspathic porcelain
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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