Term
|
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
|
|
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
|
|
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
|
|
Term
| What is amalgam strength effected by? |
|
Definition
| high compression but low tensile/shear |
|
|
Term
| Is creep a problem with high copper amalgams? |
|
Definition
|
|
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
|
|
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
|
|
Term
| Products with zinc will have BLANK expansion. |
|
Definition
|
|
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 |
|
|
