During post insertion examination of a 3 unit ceramometal fixed partial denture. One of the retainers showed chipping of porcelain at the ceramometal junction. In order to avoid the problem the dentist must:
a- Reduce the metal to 0.3 mm.
b- Have uniform porcelain thickness.
c- Have occlusion on metal.
d- Keep porcelain metal junction away from centric contacts.***
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Alloy system all possible combinations of alloy d 2 or + elmntos, being at least one of them a metal (examples) gold-silver / gold-copper / silver-copper systems Working time: is the time that has elapsed since it mix the materials until it allows its use (work with it) Runoff or flow: A wax's ability to deform under light pressures, which means plastic deformation. It depends on the strength and temperature Thermal expansion:% to the amount and type of silica
Glass ionomers: cement resulting from the combination of an aqueous solution containing acid homopolymers or copolymers. Polyalkenoic or polycarboxylic and a double calcium and aluminum silate with fluoride Thermoplasticity: Characteristic of the material that allows consistency changes in relation to temperature, ("softens when heated and becomes rigid when cooled") Humidification: Flowing fluid's ability easily over the entire surface of the solid and adhere to it Cohesion: Strength of union between equal molecules
Adhesion: Bonding force between different molecules Chemical bonding: Bonding procedures that are carried out through the start-up of any of the known chemical bonds (primary bonds - ionic, covalent, ..-, secondary bonds - hydrogen bonds, forces de Van der Waals, ..-) Adhesive: Material or film used for adhesion Adhesives: Material on which the adhesive is applied Adhesive systems: A set of materials and techniques used to adhere a restorative material to the tooth, or to adhere different dental materials with each other.
CERAMIC = Material of a mineral nature, not metallic, processed by heat, in a PORCELAIN oven = High quality ceramic, less porous, hard, rigid and of excellent appearance and surface qualities CERAMIC, Material of mineral origin, not metallic hard, fragile and rigid, obtained by the action of heat, in an oven The predominant structure is amorphous but with very heterogeneous particles distributed in the form of glass, inside the SINTERED material Process by which dust particles, previously compacted, subjected at high temperatures and pressure, but lower than those of the complete fusion, quedanappearance of porosities between partially joined particles remains superficially attached.
GLASS Non-metallic material, hard, fragile and rigid and transparent, obtained by the action of heat, by fusion of the components and subsequent cooling. It is an amorphous material composed of silicates and carbonates. DEVITRIFICATION = CERAMIZATION = CRYSTALLIZATION Appearance of glazed areas inside the amorphous ceramic mass, with the consequent loss of transparency estética aesthetic advantage that allows, together with the use of dyes, to achieve similarity with the natural tooth GLASS CERAMIC Solid consisting of a glass matrix and one or more phases of glass produced by nucleation and growth of the crystals in the glass DENTAL CERAMIC Composed of metals (alumina, calcium, lithium, magnesium, potassium , sodium, tin, titanium and zirconium) and nonmetals (silicon, boron, fluorine, and oxygen) that are used as the sole component in CAD-CAM inlays or as several layers in the manufacture of ceramic-based prostheses.
a- Reduce the metal to 0.3 mm.
b- Have uniform porcelain thickness.
c- Have occlusion on metal.
d- Keep porcelain metal junction away from centric contacts.***
---------------------------------
Alloy system all possible combinations of alloy d 2 or + elmntos, being at least one of them a metal (examples) gold-silver / gold-copper / silver-copper systems Working time: is the time that has elapsed since it mix the materials until it allows its use (work with it) Runoff or flow: A wax's ability to deform under light pressures, which means plastic deformation. It depends on the strength and temperature Thermal expansion:% to the amount and type of silica
Glass ionomers: cement resulting from the combination of an aqueous solution containing acid homopolymers or copolymers. Polyalkenoic or polycarboxylic and a double calcium and aluminum silate with fluoride Thermoplasticity: Characteristic of the material that allows consistency changes in relation to temperature, ("softens when heated and becomes rigid when cooled") Humidification: Flowing fluid's ability easily over the entire surface of the solid and adhere to it Cohesion: Strength of union between equal molecules
Adhesion: Bonding force between different molecules Chemical bonding: Bonding procedures that are carried out through the start-up of any of the known chemical bonds (primary bonds - ionic, covalent, ..-, secondary bonds - hydrogen bonds, forces de Van der Waals, ..-) Adhesive: Material or film used for adhesion Adhesives: Material on which the adhesive is applied Adhesive systems: A set of materials and techniques used to adhere a restorative material to the tooth, or to adhere different dental materials with each other.
CERAMIC = Material of a mineral nature, not metallic, processed by heat, in a PORCELAIN oven = High quality ceramic, less porous, hard, rigid and of excellent appearance and surface qualities CERAMIC, Material of mineral origin, not metallic hard, fragile and rigid, obtained by the action of heat, in an oven The predominant structure is amorphous but with very heterogeneous particles distributed in the form of glass, inside the SINTERED material Process by which dust particles, previously compacted, subjected at high temperatures and pressure, but lower than those of the complete fusion, quedanappearance of porosities between partially joined particles remains superficially attached.
GLASS Non-metallic material, hard, fragile and rigid and transparent, obtained by the action of heat, by fusion of the components and subsequent cooling. It is an amorphous material composed of silicates and carbonates. DEVITRIFICATION = CERAMIZATION = CRYSTALLIZATION Appearance of glazed areas inside the amorphous ceramic mass, with the consequent loss of transparency estética aesthetic advantage that allows, together with the use of dyes, to achieve similarity with the natural tooth GLASS CERAMIC Solid consisting of a glass matrix and one or more phases of glass produced by nucleation and growth of the crystals in the glass DENTAL CERAMIC Composed of metals (alumina, calcium, lithium, magnesium, potassium , sodium, tin, titanium and zirconium) and nonmetals (silicon, boron, fluorine, and oxygen) that are used as the sole component in CAD-CAM inlays or as several layers in the manufacture of ceramic-based prostheses.
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