Save
Upgrade to remove ads
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

DENTAL MATERIALS

Indirect restorations

QuestionAnswer
Indirect restoration A restoration constructed outside the mouth in a laboratory
Alloy Combination of pure metal and one or more other elements
Pure metal Only a single metal
All metals are --------and possess high thermal and electrical conductivity, ductility, opacity and luster. crystalline
What is a crystalline property? A regular order or arrangement of atoms
Metals: Requirements for dental materials: *Strong and hard enough to withstand occlusal forces, biologically compatible, high resistance to corrosion and tarnish, can be relatively easily cast into complicated shapes
Noble/Precious metals: Gold, platinum, palladium, Iridium, Ruthenium, Niobium, Osmium
Why don't we use pure gold (24 K)? It is not strong enough to withstand chewing stresses, and it is the most conductive material in restorative dentistry.
What does copper do? Increases strength and hardness
What does platinum do? Protects against tarnish and corrosion
What does silver do? tones down the red in Cu. It is not stable in the oral enviroment unless alloyed with platinum or palladium.
What does palladium do? Increases tarnish resistance.
What does zinc do? prevents oxidation during casting procedures, acts as a scavenger.
What is a scavenger? A substance added to a mixture to remove or inactivate impurities.
What metals whiten alloy? Gold, platinum, and palladium
Type I alloy: Used for inlays NOT subjected to stress. Used for gingival cavities.
Type II alloy: Used for inlays NOT subjected to stress, but harder than type I alloy.
Type III alloy: Crown and bridge abutments. Lighter in color. Harder than I and II. Contains more palladium and platinum.
Type IV alloy: Large castings of long span bridges, partial dentures clasp and bars, HARDEST AND STRONGEST!!
Elongation: the ability of a material to be stretched without breaking. Stretching elongation is burnishing the alloy.
Base metal alloys: Alloy that does not contain noble metals. i.e. steel, brass and aluminum alloys
Why are base metal alloys of chromium, aluminum and titanium used for implants? because they are the most biocompatible metal
Ceramometal: combo that supplies both strength and esthetics i.e. PFM
A temporary restoration is also called? A provisional restoration
Sprue metal stick
Once we get the pattern created in the gypsum, how do we get the gold in? Centrifugal force
Cast metals metal alloys used in the casting process
How are cast metals classified? according to noble elements which are corrosion resistant
How are precious metals classified? based on cost
Precious metals are noble metals plus what? silver...silver is NOT noble
Classification by gold: Percents is parts per 100, Carats is parts per 24, Fineness is parts per 1000
------- and ------ are non precious metals that are white and have a high melting point. Nickel and chromium, chromium is inexpensive.
High gold or high noble alloys contain -- gold. 60%
Low gold or low noble alloys contain --noble metals with gold replaced by silver. 25%
Alloys with less than 25% noble called? base metals
------------- is used to describe metals with NO noble elements. nonprecious
------ that forms on the surface of the metal when heated help the porcelain chemically bond to the metal Oxide
What is the material of choice for dental implants and why? titanium because it is biocompatible
Another name for porcelain crowns is? Porcelain jacket crowns
C.A.D Computer Aided Design , Optical impression uses a computer and machine to create restorations.
Created by: karmstrong1
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards