A significant development in the field of orthodontics was the introduction of self-ligating brackets.
These don't need tie wires or elastic ligatures to hold the arch wire onto the bracket of the braces.
Instead, they are held on by a "trap door" built into each bracket.
The idea of self-ligating brackets dates back to the 1930s but, while many designs were patented over the years, it was not until the 1070s that a system was widely available.
During the 1980s and 1990s, many companies improved upon the idea in various ways and there is now a range of self-ligating options.
Another significant development in the 1970s was the Ortho-Tain appliances, which guide jaw growth and help correct orthodontic problems and malocclusions.
They look just like custom plastic mouthguards, and are worn mainly at night, or for only a few hours each day. Nevertheless, they still help address many types of orthodontic problems.
Around 1975, two orthodontists working independently developed systems which placed braces on the inside surfaces of the teeth.
These "lingual braces" offered people the benefits of bonded brackets with the big advantage that they were on the inside of the teeth.
This meant nobody else could see them and they became known as "invisible braces"
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