Materials Midterm Flashcards
Alloy
Combination of two or more metals
What material has been used for over 150 yrs
Amalgam
What type of restoration is glass ionomer used for
Primary teeth, final restorations in non stressed areas, sealants, core material for build ups, provisional restorations
IRM
Intermediate restorative material: short term restoration like zinc oxide Eugenol composition
Material that is still pliable when applied to teeth is what kind of restoration
Direct
Indirect restoration
A restoration fabricated outside the mouth by a lab tech
Where are indirect restorations made
In a lab
Liquids with high viscosity are not effective in what
Wetting a surface
Tensile stress
Pulls and stretches (tug of war)
Compressive stress
Pushes material together (chewing)
Shear stress
Sliding
How many mg are in a single capsule of amalgam
600 for small 800 for large
What type of restorations use amalgam
1,2,5 for direct
What is done with an amalgam capsule after mixing is complete
Placed in wide mouth airtight container labeled
Amalgamation
Mercury and alloy are mixed
How is curing time influenced for a composite restoration
Thickness and size of restoration, shade of material, manufacturers instructions
Advantage of using glass ionomer
Fluoride release, adhesion, resistance to acid erosion, strong, biocompatible with oral enviro, inhibits decay
Macrofilled composites
Conventional/traditional composite that contains large amounts of filler particles and provides strength
How many pounds per square inch does a posterior restoration need to withstand
170 pounds 28,000?
What metals make up alloy
Silver, zinc, tin, copper
What does silver do
Strength
What does tin do
Workability and strength
What does copper do
Strength and corrosion resistance
What does zinc do
Suppress oxidation
