Term
|
Definition
| a mixture of 2 or more metals. |
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|
Term
| what is dental amalgam made of? |
|
Definition
|
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Term
|
Definition
|
|
Term
| what are the 4 ingredients involved in dental amalgam? |
|
Definition
| silver, tin, copper, mercury |
|
|
Term
| where are indirect restorations made |
|
Definition
|
|
Term
| what do you use to blend the amalgam |
|
Definition
|
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Term
|
Definition
| with mechanical retention |
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|
Term
| an irregular cut silver alloy is |
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Definition
|
|
Term
| what class restoration lasts the longest and how long? |
|
Definition
| class I restorations last longest 15-18 yrs. |
|
|
Term
| what can help reduce microleakage in tooth due to percolation? |
|
Definition
|
|
Term
| how long do class II restortations usually last? |
|
Definition
|
|
Term
| what size amalgams last longest |
|
Definition
|
|
Term
| what is the % of copper content used in todays amalgams? |
|
Definition
|
|
Term
| what are the benefits of using higher copper % in silver alloy? |
|
Definition
-less corrosion
-better longevity AT MARGIN |
|
|
Term
| if different shapes of silver alloy are mixed what is this called |
|
Definition
|
|
Term
| what is a special consideration for using admixed alloys |
|
Definition
| require greater packing/condensing forces during placement. |
|
|
Term
| what are some qualities of admix |
|
Definition
need greater condensation/packing
make better contacts with adjacent teeth
easy to carve |
|
|
Term
| what is important about spherical silver alloy? |
|
Definition
less mercury used
and sets faster than admixed amalgam |
|
|
Term
| what is the reaction of silver alloy and mercury? |
|
Definition
|
|
Term
| what is the job of the silver in the amalgam |
|
Definition
-adds strength
-corrosion resistance
-setting expansion |
|
|
Term
|
Definition
-setting contraction
-decrease strength
-corrosion resistance |
|
|
Term
|
Definition
-strength
-less corrosion
-longevity at margins |
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|
Term
| zinc does what to the amalgam recipe (its job?) |
|
Definition
| increases life expectancy |
|
|
Term
| the job of mercury in the amalgam recipe is? |
|
Definition
weakening product
makes it easier to mix |
|
|
Term
| more mercury would cause what reaction |
|
Definition
|
|
Term
| less mercury in amalgam would cause what reaction |
|
Definition
| improve strength of amalgam and limit expansion time and shrinkage |
|
|
Term
|
Definition
gamma 2 (from low copper amalgams)
increases percolation, decay, and expansion contraction |
|
|
Term
|
Definition
|
|
Term
| what is the silver-mercury compound known as? |
|
Definition
|
|
Term
| what do you do to solve the gamma 2 problem |
|
Definition
|
|
Term
| what gamma phase is strongest? |
|
Definition
| origional silver tin phase is strongest |
|
|
Term
|
Definition
copper-tin compound
eta is better |
|
|
Term
| high mercury amalgams result in |
|
Definition
| more expansion for higher mercury amalgams |
|
|
Term
| high trituration increases what? |
|
Definition
| the solution of mercury, causing dimensional change |
|
|
Term
| what psi is the compressive (pushing/crushing) strength of amalgam? |
|
Definition
45000-75000
a thickness of 1.5mm is needed to withstand occlusal forces |
|
|
Term
| what shaped amalgam will develop strength the fastest |
|
Definition
| spherical amalgam will get strength the fastest |
|
|
Term
| what is the tensile (pulling) strength of amalgams |
|
Definition
|
|
Term
amalgam is resistant to abrasion?
true/false |
|
Definition
| true amalgam is resistant to abrasion |
|
|
Term
|
Definition
| a gradual dimensional change under stress from chewing forces that can result in breakdown at margins |
|
|
Term
what causes restoration failures?
corrosion or tarnish |
|
Definition
|
|
Term
|
Definition
| resin may reduce leakage, sensitivity, discoloration |
|
|
Term
| over trituration can cause |
|
Definition
poor strength
creep
poor corrosion |
|
|
Term
| under trituration can cause |
|
Definition
|
|
Term
| the zinc in the alloy can be affected by what moisture |
|
Definition
|
|
Term
| what are used in mercury free amalgams |
|
Definition
|
|
Term
| metallic mercury is the least toxic form and is absorbed where |
|
Definition
|
|
Term
| what are not recommended for bruxism patients |
|
Definition
| composites not recommended |
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