Indirect restorations
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| Indirect restoration | A restoration constructed outside the mouth in a laboratory
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| Alloy | Combination of pure metal and one or more other elements
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| Pure metal | Only a single metal
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| All metals are --------and possess high thermal and electrical conductivity, ductility, opacity and luster. | crystalline
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| What is a crystalline property? | A regular order or arrangement of atoms
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| Metals: Requirements for dental materials: | *Strong and hard enough to withstand occlusal forces, biologically compatible, high resistance to corrosion and tarnish, can be relatively easily cast into complicated shapes
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| Noble/Precious metals: | Gold, platinum, palladium, Iridium, Ruthenium, Niobium, Osmium
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| Why don't we use pure gold (24 K)? | It is not strong enough to withstand chewing stresses, and it is the most conductive material in restorative dentistry.
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| What does copper do? | Increases strength and hardness
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| What does platinum do? | Protects against tarnish and corrosion
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| What does silver do? | tones down the red in Cu. It is not stable in the oral enviroment unless alloyed with platinum or palladium.
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| What does palladium do? | Increases tarnish resistance.
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| What does zinc do? | prevents oxidation during casting procedures, acts as a scavenger.
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| What is a scavenger? | A substance added to a mixture to remove or inactivate impurities.
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| What metals whiten alloy? | Gold, platinum, and palladium
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| Type I alloy: | Used for inlays NOT subjected to stress. Used for gingival cavities.
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| Type II alloy: | Used for inlays NOT subjected to stress, but harder than type I alloy.
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| Type III alloy: | Crown and bridge abutments. Lighter in color. Harder than I and II. Contains more palladium and platinum.
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| Type IV alloy: | Large castings of long span bridges, partial dentures clasp and bars, HARDEST AND STRONGEST!!
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| Elongation: | the ability of a material to be stretched without breaking. Stretching elongation is burnishing the alloy.
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| Base metal alloys: | Alloy that does not contain noble metals. i.e. steel, brass and aluminum alloys
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| Why are base metal alloys of chromium, aluminum and titanium used for implants? | because they are the most biocompatible metal
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| Ceramometal: | combo that supplies both strength and esthetics i.e. PFM
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| A temporary restoration is also called? | A provisional restoration
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| Sprue | metal stick
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| Once we get the pattern created in the gypsum, how do we get the gold in? | Centrifugal force
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| Cast metals | metal alloys used in the casting process
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| How are cast metals classified? | according to noble elements which are corrosion resistant
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| How are precious metals classified? | based on cost
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| Precious metals are noble metals plus what? | silver...silver is NOT noble
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| Classification by gold: | Percents is parts per 100, Carats is parts per 24, Fineness is parts per 1000
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| ------- and ------ are non precious metals that are white and have a high melting point. | Nickel and chromium, chromium is inexpensive.
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| High gold or high noble alloys contain -- gold. | 60%
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| Low gold or low noble alloys contain --noble metals with gold replaced by silver. | 25%
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| Alloys with less than 25% noble called? | base metals
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| ------------- is used to describe metals with NO noble elements. | nonprecious
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| ------ that forms on the surface of the metal when heated help the porcelain chemically bond to the metal | Oxide
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| What is the material of choice for dental implants and why? | titanium because it is biocompatible
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| Another name for porcelain crowns is? | Porcelain jacket crowns
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| C.A.D | Computer Aided Design , Optical impression uses a computer and machine to create restorations.
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