Properties Of Dental Materials Flashcards
Slow plastic deformation that occurs with the application of force over time after the material has set
Creep
A measure of rigidity of a material defined by the ratio of stress to strain - below elastic limit
Elastic modulus
When cyclic forces are applied a crack may neucleate and increase by small increments each time the force is applied. In time the crack will increase to a length at which the Force results in Fracture through the remaining material
Fatigue
Resistance to penetration. A number of hardness scale is used Vickers Rockwell mon’s.
Hardness
The energy absorbed by a material undergoing elastic the formation afterwards elastic limit
Resilience
An indication of how easy it is to bend a piece of material without causing permanent information of fracture. It is dependent on the elastic modulus size shape of the specimen.
Stiffness
Change in size of a material that occurs in response to a force. It is the change in length divided by the original length
Strain
Internal force per unit cross-sectional area I think on the material. Can be classified according to the direction of the force example Tensile, compressive or shear
Stress
Ability of a material to transmit heat
Thermal conductivity
Rate at which temperature changes spread through a material
Thermal diffusivity
The amount of energy absorbed up to the point of a fracture. A function of the resilience of a material and its ability to undergo plastic deformation rather than fracture
Toughness
The abrasion or mechanical or chemical resistance of a substance
Wear
Ability of one material to flow across the surface of another, determined by the contact angle between two materials and influenced by surface roughness and contamination. The contact angle is the angle between solid and liquid, liquid and air interface is measured through the liquid
Wettability
It is also called elastic limit. Distress beyond which material is permanently deformed mean of force is applied
Yield strength
