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Mechanical Properties
Thermal Change
Properties of dental materials
Amalgam
Composite Resins
100
The average biting & chewing force in the posterior area of the mouth
What is 170 pounds
100
Two reasons thermal change is of major concern
What is contraction & expansion / protect the pulp
100
type of solubility for dental material dentist prefer that don't dissolve easily
What is low solubility
100
why dental amalgam is not placed in anterior teeth
What is esthetics
100
Inorganic material that adds strength & other characteristics to composite resins
What is filler
200
Pounds of pressure per square inch on a single cusp of a molar tooth
What is 28,000 pounds
200
Significantly different rates of contraction & expansion can cause dental material to pull away from tooth
What is microleakage
200
major concern between a dental material and the tooth structure
What is adhesion
200
four metals amalgam alloy powder is composed of
What is silver, tin, copper, and zinc
200
Resin matrix component of composite, fluid like substance
What is dimethacrylate / BIS-GMA
300
Stress that pulls & stretches the material (ex. tug of war)
What is tensile stress
300
A minute separation of material & tooth could allow fluids, debris, and microorganisms to enter between the restoration
What is percolation
300
Property of a liquid that causes it not to flow easily
What is viscosity
300
The metal used for it's strength & corrosion resistance
What is copper
300
important factors in determining the strength & wear-resistant characteristics of material
What is particle size & type/ amount of filler
400
push or pull on matter
What is force
400
The measure of the capacity of a metal to be extended in all directions by a compressive force
What is malleability
400
Required for adhesion to take place & remain permanent
What is thin film thickness
400
The influence of the trituration & working characteristics (condensing& carving) of the resulting amalgam mixture
What is particle shapes
400
The process which resin material is changed from a pliable state into a hardened state
What is polymerization
500
The breakdown of material as the result of something sliding over two area's
What is shear stress
500
surface discoloration that we see in older amalgam restorations
What is tarnish
500
The ability to hold 2 things firmly together when they will not adhere to each other naturally
What is retention
500
Metal used to suppress oxidation
What is zinc
500
Most unique feature of glass ionomers
What is release of fluoride