Biomedical Engineering Reference
In-Depth Information
Table 8.3
Relative levels of important properties for selection of
orthodontic wire alloys [4]
Cobalt-
chromium-nickel
(Elgiloy blue)
β-Titanium
(TMA)
Nickel-
titanium
Property
Stainless steel
Cost
Low
Low
High
High
Force delivery High
High
Intermediate Light
Elastic range
(springback)
Low
Low
Intermediate High
Formability
Excellent
Excellent
Excellent
Poor
Easy of joining Can be
soldered.
Welded joints
must be
reinforced with
solder
Can be soldered.
Welded joints must
be reinforced with
solder
Only wire
alloy that
has true
weldability
Cannot be
soldered
or welded
Archwire-
bracket friction
Lower
Lower
Higher
Higher
Concern
about bio-
compatibility
Some
Some
None
Some
References
1. Ahmad, I. (1988). Smart Structures and Materials, in
Proceedings of
U
.
S
.
Army Research Ofice Workshop on Smart Materials
,
Structures and
Mathematical Issues
(ed. Rogers, C.A.), Virginia Polytechnic Institute
& State University, Technomic Publishing Co., Inc., pp. 13-16.
2. Beuhler, W.J., Gilfrich, J.V., and Wiley, R.C. (1963). Effect of low
temperature changes on the mechanical properties of alloys near
composition TiNi ,
J
.
Appl
.
Phys
.,
34
, pp. 1475-1477.
3. Beuhler, W.J and Wiley, R.C. (1965). US Patent 3 174 851.
4. Brantley, WA., and Eliades, T. (2001).
Orthodontic materials
,
in
Orthodontic Wires: Scientific and Clinical Aspects
, Thieme, New York,
pp. 77-103.
5. Chang, L.C., and Read, T.A. (1951). Plastic deformation and diffusionless
phase changes in metals — the gold-cadmium beta phase,
Trans
.
Amer
.
Inst
.
Min
.
Metall
.
Eng
.,
191
, pp. 47-52.
