Properties of Ortho Arch Wires
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define the load/elongation curve
L/E curve takes into consideration the geometry of the specimen aka extrinsic stiffness
define S/S curve
normalizes out geometry aka intrinsic stiffness
true/false: elastic modulus can be obtained from a L/E curve
false. it cannot be obtained from the L/E curve
define proportion limit
point at which any permanent deformation is first observed
define yield point
deformation of 0.1%, wire will not return to its original state
define ultimate tensile strength
maximum load, greater than yield strength
define failure point
point at which the wire breaks
proportional to elastic modulus. steeper slope = stiffer wire.
1/stiffness or 1/elastic modulus. more horizontal the slope = springier wire.
distance wire will bend elastically before permanent deformation
stiffness x range
area under S/S curve from 0 to proportional limit/yield stength
amount of permanent bending the wire will tolerate before it breaks or fails. area under S/S curve from YP to FP
what happens to strength, stiffness, springiness and range if the diameter is increased?
- increase: strength, stiffness
- decrease: springiness, range
what happens to strength, stiffness, springiness and range if the length is increased?
- increase: springiness, range
- decrease: strength, stiffness
round or rectangular wires elicit more force?
rectangular (more stiffness)
list 4 ways loops are used in arch wires
- 1. align teeth
- 2. increase force of the wires
- 3. increase flexibility of wires
- 4. hold soft tissues away from orthodontic brackets
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