Dental materials Flashcards
What are the 4 main dental material types
Restorative
Impression
Dentures
Metals & Alloys
What dental material is most commonly used
Restorative
Which material has a greater compressive strength:
Amalgam
Composite
Amalgam
What is viscosity
Ability to flow
When would low viscosity material be used
To acheive the most accurate record of tooth surface detail
Why are high viscosity materials desirable
Most dimensionally stable after setting and removing
How is two tone impression acheived
Take impressions with high viscosity material
Then place low viscosity material directly around teeth and reinsert original impression
What property specifically applies to acrylic
Transverse strength
What is acrylic used for
Dentures
What are metals and alloys used in
Partial denture frameworks
Orthodontic wires
Denture bases
How can we determine if a material is rigid
If the force applied to compress the material causes a small change in shape the material if rigid
When is a material classed as flexible
If a force causes a large change in shape
Define elasticity
ability of material to return to its original shape on removal from mouth using an applied force
Define rigidity
measure of how much force is needed to cause a temporary change in shape of material
What is creep
change in shape due to repetitive application of small forces
