DMS vocabulary
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what is meant by fracture?
large force causes catastrophic destruction of materials structure
what is meant by hardness in relation to dental materials?
ability of surface to resist indentation
what is meant by abrasion in relation to dental materials?
material surface removal due to grinding
what is meant by abrasion resistance in reference to dental materials?
ability to withstand surface layers being removed, so compromising surface integrity
what is meant by fatigue in reference to dental materials?
repetitive “small” stresses causes material fracture
what is meant by creep in reference to dental materials?
gradual dimensional change due to repetitive small forces • small forces are applied over long period of time • causes the material to dimensionally change & flow • results in permanent deformation
what is meant by deformation of a dental material?
applied stress causes permanent change in materials dimensions - does NOT FRACTURE IT
in reference to dental materials, what is meant by elasticity?
the ability of a material to recover its dimensions after experiencing a stress
what are examples of chemical properties?
• setting mechanism • setting time • corrosive potential
what are examples of physical properties in dental materials?
• viscosity • thermal conductivity • thermal expansion • density • radiopacity
what are examples of mechanical properties of dental materials?
• hard/soft • strong/weak • rigid/flexible • ductile/brittle