Restortion Flashcards
What is the Amalgams composition?
silver, tin, copper, zinc set with mercury
Why is the Amalgam a good product?
Because it’s strong
When does dental amalgam reach the final set? why does the patient need to be careful for that period time
24-48 hours and because it’ll damage it
What is the greatest threat to dental personnel when using amalgam
Illation.
How do you mix dental amalgam
With the amalgamator
why is a pre-measured capsule the best way to dispense amounts of alloy and Mercury?
Consistency and safer, time consuming
What is a composite restoration? Why is this a good product?
man made, tooth colored and relatively strong
what is the advantage of porcelain product over a composite product?
Because I would choose it since it looks better composite is more like a plastic material
A two paste system is polymerized by what means? The single piece system is polymerized how?
two paste is chemical and sets by itself
Single paste needs light to cure it
What is a veneer crown? Describe how it looks in the mouth
A layer of material placed over a tooth either to improve or to protect the tooth surface from damage
They look natural in the mouth
What are the steps in placing amalgam?
capsule in the amalgamator,open capsules,put in well, amalgam carrier, plugger, burnisher, carver.
Define galvanic shock
Caused by an electrochemical circuit formed when adjacent or opposing dental restorations made of dissimilar metal alloys ( amalgam and gold) come into contact in the presence of saliva
Define comprehensive strength of a product
Push or Compress easily
Describe dimensional change In a product
When the structure changes
Thermal conductivity
Picks up heat or cold
Define crystallization
Chemical process in which crystals form a structure
Define polymerization
Process of changing a simple comical into another substance that contains the same elements
During the steps of bonding describe the process
volcanic ash, wash and dry, clean of with pumpis, wash and dry, etch (blue), wash and dry, then put on your primer.
What is an amalgam?
Silver restoration
An alloy of mercury with another metal
How much is in one spill, two spill, and three spill
400
600
800
What are the defects of under triturated mix
Slow setting time
Looks dull
Difficult to work with
Poor resistance to corrosion
Triturates
To mix
Corrosion
Is the dissolution of materials in the mouth
Tarnish
Is a reaction of metal in the mouth from saliva or foods
Vaporizes
Particles of mercury scatter and float freely in the air at a relatively low room temperature
What are the four classes of material
Metals (silver and gold)
Ceramics (porcelain)
Polymers (bleach trays)
Composites ( filling tooth)
Luster
Bright and shinny
Ductility
Can be bent without breaking
Opacity
Does not transmit light
What are the 3 basic types of forces
Tensile- forces that pulls an object apart
Compressive- application of force that squeezes it together
Shear-force that slides on top of an object over the bottom
Stress
Force per area
Strain
Change in dimension
Elastic limit
Maximum stress level
Ultimate strength
Before a material will break
Fatigue
Repeated actions of stress
Advantages of amalgam
Easily used
Limited dimensions change during hardening
Non-Corrosive characteristic
Minimal marginal leakage is limited To micro leakage
Disadvantages for amalgam
Does not match tooth color
Requires a larger preparation design
Therm conductivity is high in rate
Tarnish
