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Properties

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Question
Answer
Thermal Conductivity   rate of heat conduction through a material when a temperature difference occurs through the material  
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Hardness   surface resistance to scratching  
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Abrasion (wear)   removal of surface layers when two surfaces make frictional contact  
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Rigidity   Young's Modulus - Ratio of stress to strain. Measure of amount of stress needed to cause material dimensions to change (ie undergo strain)  
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Depth of Cure   Depth at which composite resin hardness is half that of the surface  
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Creep   ability of material to change its shape when low level loading is applied repeatedly  
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Thermal expansion   contraction or expansion rate of material compared to tooth during temperature differences  
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Viscoelasticity   Strain vs. Time  
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