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DHE132 Chapter3
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Primary bonds -
Strong bonds with elecronic attraction; ionic bonds, covalent bonds, metallic bonds
Secondary bonds -
Weaker bonds than primary bonds; hydrogen bonds, van der Waals forces, London Dispersion Forces
Brittleness -
The hardness, and likelihood of breaking or cracking, of a material
Density -
The measure of the weight of a material compared with its volume
Hardness -
The resistance of a solid to penetration
ultimate strength -
the maximum amount of stress a material can withstand without breaking
Elasticity -
The ability of a material to recover its shape completely after deformation from an applied force
Stiffness -
A materials resistance to deformation
Proportional limit -
The greatest stress a structure can withstand without permanent deformation
resilience -
The ability of a material to absorb energy without permanent deformation
Toughness -
The ability of a material to resist fracture
Ductility -
The ability of an object to be pulled or stretched under tension without rupture
Malleability -
The ability to be compressed and formed into a thin sheet without rupture
Edge strength -
The strength of a material at fine margins
Durability -
The ability of a material to withstand damage due to pressure or wear
Viscosity -
The ability of a liquid material to resist flow
Thixotropic -
Liquids that flow more readily under mechanical force
Direct restorative materials -
Restorations placed directly into a cavity preparation
Indirect restorative materials -
Materials used to fabricate restorations outside the mouth that are subsequently placed into the mouth
Permanent restorations -
Restorations that are expected to be long-lasting
Temporary restorations -
Restorations expected to last several weeks to months
Mixing time -
The amount of time allotted to bring the components of a material together into a homogeneous mix
Working time -
The time permitted to place and manipulate the material in the mouth
Initial set time -
The time at which the material can no longer be manipulated in the mouth
Final set time -
The time at which the material has reached its ultimate state
Chemical set materials -
Materials that set through a timed chemical reaction with the combination of a catalyst and base
Light-activated materials -
Materials that require a blue light source to initiate reaction
Dual set materials -
Materials that polymerize when the materials is initiated by exposure to a blue light source and then continue with a chemical set reaction
Shelf life -
The useful life of a material before it deteriorates or changes in quality
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Author
dentalhygiene
ID
337646
Card Set
DHE132 Chapter3
Description
DHE132 Chapter3
Updated
2018-01-29T21:29:41Z
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