TY - JOUR
T1 - Torsional elastic property measurements of selected orthodontic archwires
AU - Larson, Brent E.
AU - Kusy, Robert P.
AU - Whitley, John Q.
PY - 1987
Y1 - 1987
N2 - A method for quantifying the torsional elastic properties of orthodontic archwires was investigated using three different alloys: stainless steel [SS], beta titanium [βTi], and nickel titanium [NiTi]. The shear moduli (G) were determined dynamically using a torsion pendulum. Aftera clamping correction was applied, the values of (G equalled 11.0-11.3, 4.3-4.4, and 2.3-3.0 Msi for SS, βTi, and NiTi wires respectively. Using a 10% energy loss criterion in a static test, the torsional yield strengths (τys) were all nearly 100 ksi except for the 0.018″ SS (51 ksi) and rectangular NiTi (13-17 ksi). The latter exhibited some pseudoelastic behaviour which could only be accommodated by the Johnson Elastic Limit (JEL). Having determined G, Tys, and the wire dimensions, the three basic torsional elastic properties (stiffness, strength, range) were calculated for each of the wires. The NiTi wires displayed the greatest range and the least stiffness, whereas SS wires showed the greatest stiffness and the least range. As predicted in earlierwork, the properties of βTi were intermediate.
AB - A method for quantifying the torsional elastic properties of orthodontic archwires was investigated using three different alloys: stainless steel [SS], beta titanium [βTi], and nickel titanium [NiTi]. The shear moduli (G) were determined dynamically using a torsion pendulum. Aftera clamping correction was applied, the values of (G equalled 11.0-11.3, 4.3-4.4, and 2.3-3.0 Msi for SS, βTi, and NiTi wires respectively. Using a 10% energy loss criterion in a static test, the torsional yield strengths (τys) were all nearly 100 ksi except for the 0.018″ SS (51 ksi) and rectangular NiTi (13-17 ksi). The latter exhibited some pseudoelastic behaviour which could only be accommodated by the Johnson Elastic Limit (JEL). Having determined G, Tys, and the wire dimensions, the three basic torsional elastic properties (stiffness, strength, range) were calculated for each of the wires. The NiTi wires displayed the greatest range and the least stiffness, whereas SS wires showed the greatest stiffness and the least range. As predicted in earlierwork, the properties of βTi were intermediate.
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U2 - 10.1016/0267-6605(87)90043-6
DO - 10.1016/0267-6605(87)90043-6
M3 - Article
AN - SCOPUS:38149144718
VL - 2
SP - 165
EP - 179
JO - Biomaterials
JF - Biomaterials
SN - 0142-9612
IS - 3
ER -