Dental materials

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Author:
sthomp88
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60859
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Dental materials
Updated:
2011-01-19 22:08:40
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chapter two key terms
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week one
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  1. materials used to treat disease
    therapeutic agent
  2. the property of a material that allows it to not impede or adversely affect living tissue
    biocompatible
  3. materials used to reconstruct tooth structure
    restorative agents
  4. force applied to compress an object
    compressive force
  5. force applied in opposite directions to stretch an object
    tensile force
  6. force applied when two surfaces slide against each other or in a twisting or rotating motion
    shearing force
  7. the internal force, which resists the applied force
    stress
  8. distortion or deformation that occurs when an object cannot resist a stress
    strain
  9. bending caused by a combination of tension and compression
    flexural stress
  10. a fracture resulting from repeated stresses that produce microscopic flaws that grow
    fatigue failure
  11. a material's ability to maintain its position without displacement under stress
    retention
  12. susceptible to being dissolved
    solubility
  13. the ability to absorb moisture
    water sorption
  14. deterioration of a metal caused by a chemical attack or electrochemical reaction with dissimilar metals in the presence of a solution containing electrolytes (such as saliva)
    corrosion
  15. discoloration resulting from oxidation of a thin layer of a metal at its surface. It is not as destructive as corrosion
    tarnish
  16. an electrical current transmitted between 2 dissimilar metals
    galvanism
  17. a change in the size of matter. For dental materials, this usually manifests as expansion caused by heating and contraction caused by cooling
    dimensional change
  18. the measurement of change of volume or length in relationship to change in temperature
    coefficient of thermal expansion
  19. movement of fluid in the microscopic gap of the restoration margin as a result of differences in the expansion and contraction rates of the tooth and the restoration with temperature changes associated with ingestion of cold or hot fluids or foods
    percolation
  20. the rate at which heat flows through a metal
    thermal conductivity
  21. materials having low thermal conductivity
    insulators
  22. the production of heat resulting from the reaction of the components of some materials when they are mixed
    exothermic reaction
  23. the act of sticking two things together. In dentistry, it is used to describe the bonding or the atoms or molecules of dissimilar substances bond together and differes from cohesion in which attraction among atoms and molecules of like (similar) materials holds them together
    adhesion
  24. to connect or fasten; to bing
    bonding
  25. the ability of a liquied to wet or intimately contact a solid surface. Water beading on a waxed car is an example of poor ___________
    wetting
  26. the ability of a liquid material to flow
    viscosity
  27. the minimum thickness obtainable by a layer of a material. It is particularly important to dental cements
    film thickness
  28. the electrical charge that attracts atoms to a surface
    surface energy
  29. the space between the walls of the preparation
    interface
  30. leakage of fluid and bacteria caused by microscopic gaps that occur at the interface of the tooth and the restoration margins
    microleakage
  31. the color of the tooth or restoration. It may include a mixture of colors, such as yellow-brown
    hue
  32. the intensity or strength of a color (e.g. a bold yellow has more __________ than a pastel yellow)
    chroma
  33. how light or dark a color is. A low ______ is darker and a higher _______ is brighter
    value
  34. light passing directly through an object
    transparent
  35. optical property in which light is completely absorbed by an object
    opaque
  36. varying degrees of light passing through and being absorbed by an object
    translucency
  37. a life-like quality
    vitality

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