Random
Creep
Slow permanent deformation of dental materials due to compression by opposite dentition.
Strain
how much a material deforms in response to the stress. Amount of change force produced in an object
Ultimate strength
after this point, the material breaks down in response to stress.
Percolation
gap created due to difference in expansion and contraction rate of dental material and teeth surfaces in response to change in temperature. Fluid seep into these gaps and cause recurrent caries.
Stress-strain curve
Young's modulus
dentin lower modulus can deform, brittle
Flow
Temporary deformation of dental material in response to pressure or force. i.e fl trays
elastic region
where the material will go back to original place and no deformation happen
Resilience
energy absorbed by material and withstand stress. if a material is resilient it will withstand stress, absorb energy and come back to original place without being deform. Ability to withstand stress
Force
the push, the pull and the twist
Plastic region
where material does not go back to its original place and gets deformed.
Toughness
how strong/tough the material is by how much energy needed to fracture the material.
Stress
when we put force on a dental material it resists that force and in resisting the force it creates an inner stress.
Yield point
after this point the dental material starts to permanently deform
Fatigue
when repeated stress material eventually break