Porcelain Build Up

Dental Porcelain (Feldspathic)

Glassy ceramics that form from the combination of feldspar, silica and alumina.

Feldspar - Silica - Alumina

Dental Porcelain (Feldspathic) is formed by the combination of (3)?

Dental Porcelain (Feldspathic)

Oldest of the dental ceramics and are very esthetic but relatively weak.

Feldspar

(Porcelain Composition) Forms the glassy matrix.

Quartz

(Porcelain Composition) Serves as a strengthener, present as a fine crystalline dispersion through the glassy phase.

Kaolin

(Porcelain Composition) Acts as a binder.

Fluxes

(Porcelain Composition) Used to decrease firing temperature.

Metal Oxides

(Porcelain Composition) Provide different variety of colors.

Condensation and Build Up

(Step) Porcelain powder is mixed with water then applied to the surface of the core, form the porcelain to the required shape and remove as much water material to prevent decrease in firing shrinkage.

Water - Core - Shrinkage

Porcelain powder is mixed with _____ then applied to the surface of the ____, form the porcelain to the required shape and remove as much water material to prevent decrease in firing _________.

Vibration - Brush - Spatulation

3 Condensation methods.

Opaque Porcelain

(Porcelain used in build up) Serves to obscure the color of metal core.

Body Porcelain

(Porcelain used in build up) Makes up the bulk of the restoration and providing the necessary color or shade.

Incisal Porcelain

(Porcelain used in build up) Provide translucency on the incisal portion which mimics the natural look of the teeth.

Sintering / Firing

(Step) Fuses the porcelain particles together.

Low Bisque Stage

(Sintering Stage) Particles lack complete adhesion, porous and low amount of shrinkage occur.

Medium Bisque Stage

(Sintering Stage) Water evaporates, better cohesion of particles with some porosity.

High Bisque Stage

(Sintering Stage) Particles are completely fused and cohesive with no more shrinkage.

High Fusing

(Porcelain types acc. to temp) Used to manufacture artificial denture teeth but rarely for tooth restoration.

Medium Fusing

(Porcelain types acc. to temp) Used in the fabrication of all ceramic restorations such as porcelain jacket crown, except metal-ceramic crown.

Low Fusing

(Porcelain types acc. to temp) Used to fabricate metal-ceramic crowns.

Glazing

(Step) To obtain a smooth surface that simulates a natural tooth.

Autoglazing

(Glazing) Rapid heating to reach fusing temperature to melt surface particles.

Applied Glaze

(Glazing) Applying glaze material on the surface and refiring.

Cooling

(Step) Bench cooling after refiring.