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Improvement of pseudoelasticity and ductility of Beta III titanium alloy—application to orthodontic wires by P Laheurte, A Eberhardt, MJ Philippe, and.

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Presentation on theme: "Improvement of pseudoelasticity and ductility of Beta III titanium alloy—application to orthodontic wires by P Laheurte, A Eberhardt, MJ Philippe, and."— Presentation transcript:

1 Improvement of pseudoelasticity and ductility of Beta III titanium alloy—application to orthodontic wires by P Laheurte, A Eberhardt, MJ Philippe, and L Deblock Eur J Orthod Volume 29(1):8-13 February 8, 2007 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

2 Wire rigidity on dental displacement—‘ideal’ wire with constant force (A) and with two different rigidities (B). P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

3 Tensile diagram showing the apparent modulus (Etg), unloading secant modulus (Es), recoverable strain (εr), and strain to fracture (εm). P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

4 Tensile diagrams of principal orthodontic wires, and compared with bone Es = secant modulus. P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

5 Influence of heat treatment on (a) ductility and (b) the recoverable strain and unloading secant modulus. P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

6 Influence of plastic pre-deformation (0 1, and 15 per cent) on the recoverable strain εr = εM + εelast and on the unloading secant modulus (rectangular wires 0.63 × 0.43 mm). P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

7 Influence of grain size on (a) recoverable strain and (b) unloading secant modulus. P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

8 Comparison of unloading secant modulus (Es) and recoverable strain (εr) of principal alloys with optimized Beta III: (a) εr and Es modulus and (b) strain to fracture. P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

9 Scanning electron micrograph of Beta III alloy (×200) after bending at 180 degrees: (a) optimized structure and (b) cold wiredrawing. P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

10 Beta III characteristic of bending test: loading–unloading cycles for three imposed deflexions at 0.5, 1, and 1.5 mm (wire 0.17 × 0.25 inch, distance between the two brackets 14 mm). P Laheurte et al. Eur J Orthod 2006;29:8-13 © The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.


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