Editing Shape-memory alloy (section)

==== Dentistry ====
The range of applications for SMAs has grown over the years, a major area of development being dentistry. One example is the prevalence of [[dental braces]] using SMA technology to exert constant tooth-moving forces on the teeth; the nitinol [[archwire]] was developed in 1972 by [[Orthodontics|orthodontist]] [[George Andreasen]].<ref>[https://www.nytimes.com/1989/08/15/obituaries/george-andreasen-55-orthodontics-inventor.html Obituary of Dr. Andreasen]. New York Times (1989-08-15). Retrieved in 2016.</ref> This revolutionized clinical orthodontics. Andreasen's alloy has a patterned shape memory, expanding and contracting within given temperature ranges because of its geometric programming.

[[Harmeet D. Walia]] later utilized the alloy in the manufacture of root canal files for [[endodontics]].