Ch 11 Metals
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| What should accompany the delivery of any type of crown from the dental laboratory and be placed into the patients file? | Certificate
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| What information is on the certificate? | Materials(name of alloy), Composition, ADA classification (color coded based on noble metal content), &Manufacturer
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| What is the name of the process for melting metal to make a crown | Casting
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| What is the difference between noble, high noble and base metals? | o High noble 60% , 40% of which must be gold, expensive
o Noble alloys 25% noble elements with no gold requirement
o Base-metal alloy-less than 25% of noble
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| Discuss biocompatibility of metals? | Base-metal alloy potential biocompatibility problems
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| What is an alloy? | Metal is made by combining two or more metals, esp to give greater strength or resistance to corrosion.
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| What is a significant characteristic of a noble alloy? | o Does not easily corrode
o Superior in resistance to corrosion or oxidation
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| List three uses for base metals? | o Important for partial denture framework
o Casting alloys/Porcelain bonding alloys
o Ortho appliances
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| What are the two most common base metal alloys used in dentistry? | o Chrome-cobalt and Nickel-chrome
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| What are two disadvantages for working with base metals? | o High casting temperatures and biocompatibility problems
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| What are three advantages of base metals? | o Lighter, Stiffer - Take twice the stress to deform the base metal, and Cost less
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| How are wrought metals different from casting alloys? | o Wrought metals are formed after the metal is cast, and used to describe the shaping, altering, molding, and manufacture of various metals.
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| Which metal has the highest incidence of metal allergies? | Nickle
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