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DENTMAT PORCELAIN

QuestionAnswer
a strengthener. Quartz
uses alumina instead of quartz as a strengthener. This porcelain is considerably stronger than conventional porcelains. Aluminous Porcelain
a clay and sticky material that binds the particles together when the porcelain is "green" or unfired Kaolin
it forms a glassy material, which gives porcelain its translucency acts as a matrix , which then forms a refractory skeleton for the other materials to fuse around. FELDSPAR
high, medium, low used to manufacture DENTURE TEETH. High-fusing porcelains
high, medium, low used for all-ceramic and porcelain jacket crowns. Medium-fusing porcelains -
high, medium, low used for metal-ceramic (PFM) crowns. Low-fusing porcelains
increase low-fusing porcelain resistance to "slumping down" during firing. Aluminum oxide
also added to low-fusing porcelains. Calcium oxide
modifiers that help reduce cross linkages between oxygen and silicone to lower the porcelain's fusing temperature. However, this also decreases the viscosity of the porcelain that may "slump down" during firing. Oxides of potassium, sodium, and chromium
necessary for all gold-porcelain systems. the process by which a casting is heated in a porcelain furnace to a temperature of 980°C to burn off any remaining impurities prior to adding porcelain. Degassing
used for conventional porcelain-jacket crowns. Feldspathic porcelain
found in Vitadur, Hyceram, Cerestore, & Inceram systems. Aluminous porcelain
is used to reinforce glass. Porcelain strength is determined by the amount of this reinforcement. Alumina
found in Dicor & Cerapearl systems . Mica glass
used with Optec, Cerestore & Empress systems. This is a glass in which a crystalline substance like leucite is dispersed to impart strength to the ceramic Crystalline-reinforced glass
Fabrication Method: • used with Optec, Hyceram, & Inceram systems. Refractory die technique
Fabrication Method: • used with Dicor systems. Casting
Fabrication Method: • used with Cerestore & Empress systems Press technique
STAGES INVOLVED IN FIRING DENTAL PORCELAIN Particles lack complete adhesion, low amount of shrinkage occur and very porous. Low bisque firing
STAGES INVOLVED IN FIRING DENTAL PORCELAIN Water evaporates with better cohesion to powder particles and some porosity. Medium bisque firing
STAGES INVOLVED IN FIRING DENTAL PORCELAIN Fusion of particles to form a continuous mass, complete cohesion and no more shrinkage High bisque firing
It is non-porous, resists abrasion, possesses esthetic ability, and is well tolerated by the gingiva. Glazed Porcelain
the LEAST IRRITATING to the gingival tissues compared to polished cast gold, polished direct filling gold, and polished acrylic resin. Glazed porcelain
It is a ceramic powders that may be added to a porcelain restoration after it has been fired. Over glazes
The absolute minimum required thickness of the porcelain is ___mm O.7mm
The necessary thickness of metal substructure is ___mm 0.5mm
PFM ALLOYS: used to fabricate metal-ceramic restorations (PFMs). High-gold noble alloys
PFM ALLOYS: oxidizes on casting Palladium-Silver alloys
PFM ALLOYS: These base metal alloys readily oxidize and can create porcelain-to-metal interface problems. Nickel-Chromium alloys
When porcelain is fired too many times it can ______ (appearing as a "milky" state and makes glazing very difficult). devitrify
In metal-ceramic restorations, failure or fracture usually occurs in the _______ Porcelain
Porcelain baked onto a high-fusing gold alloy may exhibit a green discoloration most likely due to metal contamination by ____ traces. Copper
Created by: nixieee
 

 



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