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dental braces
Dental braces (also known as braces, orthodontic cases, or cases) are devices used in orthodontics that align and straighten teeth and help to position them with regard to a person's bite, while also working to improve dental health. They are often used to correct underbites, as well as malocclusions, overbites, open bites, deep bites, cross bites, crooked teeth, and various other flaws of the teeth and jaw. Braces can be either cosmetic or structural. Dental braces are often used in conjunction with other orthodontic appliances to help widen the palate or jaws and to otherwise assist in shaping the teeth and jaws.
== History ==
=== Ancient ===
According to scholars and historians, braces date back to ancient times. Around 400-300 BC, Hippocrates and Aristotle contemplated ways to straighten teeth and fix various dental conditions. Archaeologists have discovered numerous mummified ancient individuals with what appear to be metal bands wrapped around their teeth. Catgut, a type of cord made from the natural fibers of an animal's intestines, performed a similar role to today’s orthodontic wire in closing gaps in the teeth and mouth.〔(A Brief History of Orthodontic Braces ). ArchWired. Retrieved on 2011-02-03.〕
The Etruscans buried their dead with dental appliances in place to maintain space and prevent collapse of the teeth during the afterlife. A Roman tomb was found with a number of teeth bound with gold wire documented as a ligature wire, a small elastic wire that is used to affix the arch wire to the bracket. Roman philosopher and physician Aulus Cornelius Celsus first recorded the treatment of teeth by finger pressure.〔 Unfortunately, due to lack of evidence, poor preservation of bodies, and primitive technology, little research was carried on dental braces until around the 17th century, although dentistry as a profession was by then making great advancements.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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