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Chapter 6
Amalgam
31
Anthropology
12th Grade
06/23/2013

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Term
What is an amalgam?
Definition
alloy of metals including mercury
Term
What is a dental amalgam?
Definition
powdered metal (silver & tin) mixed with liquid mercury
Term
What is amalgamation/ trituration?
Definition
the mixing process of amalgam
Term
What is the machine called that is used to mix amalagm?
Definition
amalgamator/triturator
Term
What is the working time of amalgam?
Definition
the time needed to condense and carve, not directly controlled by the dentist
Term
Are amalgams direct or indirect restorations? How are they held in place?
Definition
Direct restorative material held in place by mechanical retention
Term
What are the 3 types of alloy materials?
Definition
-Lathe-cut – chips of metal
-Spherical - balls of metal
-Blended – combination of both
Term
What are some advantages of using dental amalgam?
Definition
•Tough
•Wear resistant
•Long-lasting
•Cost-effective
•Seals margins as corrosion occurs microleakage is reduced
Term
What are admix High-Copper Dental Amalgams?
Definition
mixture of 2 particle shapes
Term
How much % copper are high copper dental amalgams?
Definition
10 -30% copper
Term
What are some good points of spherical high-copper dental amalgams?
Definition
-Spherical particles need less mercury to wet particles
-Softer, musher product
-Reducing amount of mercury increases strength of dental amalgam
Term
What do manufacturers control with amalgams?
Definition
–Alloy composition and shape
–Particle size and distribution
Term
What do dentists control with amalgams?
Definition
1.titration
2.condensation
3.atanomical form and finishing
Term
What does over titration cause? Under?
Definition
-over (crumble difficult to condense)
-Under (mushy-grainy feel because not all particles are broken up – difficult to condense)
Term
How does condentation effect amalgams?
Definition
-clean and dry environment
-Saliva contamination increases leakage
-Zinc containing will excessively expand with saliva contamination
Term
How does anatomical form and finishing effect amalgams?
Definition
-Periodontal problems: overhanging margins/open contacts
-Occlusal trauma: undercarved or high restorations
-Poor condensation defects around margins cause recurrent decay
Term
What is dimensional change effected by?
Definition
effected by technique
Term
What is amalgam strength effected by?
Definition
high compression but low tensile/shear
Term
Is creep a problem with high copper amalgams?
Definition
no
Term
What can corrode dental amalgam?
Definition
acid/cariogenic diet, causes margins to look bad but is still sealed at interface
Term
What classes of decay do dental amalgams restore?
Definition
Restore class I, II, V, VI
Term
What is a Amalgam buildup or amalgam core used for?
Definition
foundation for a future crown
Term
what should amalgams be used with to seal margins to reduce leakage?
Definition
a cavity varnish such as Copal Varnish
Term
What is varnish under amalgams being replaced by?
Definition
dentinal bonding systems
Term
Will dentinal bonded restoration decrease sensitivity or increased life expectancy?
Definition
No research to support decreased sensitivity or increased life expectancy of bonded restoration
Term
WHat type of product should be used when choosing an amalgam?
Definition
precapsulated product
Term
Products with zinc will have BLANK expansion.
Definition
delayed
Term
When can an amalgam be polished?
Definition
Delayed for 24 hours to allow amalgam to set Improve appearance
Term
What is mercury toxicity?
Definition
vapor inhaled into lungs can cause kidney and nervous system problems
Term
What are the 3 types of gold restorations?
Definition
•Gold foil, direct gold, or cohesive gold
Term
Are gold restorations generally big or small?
Definition
generally small due to lack of strength
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