Final answer:
1) Braces. They are orthodontic fixed appliances used to correct teeth and bite misalignments by applying continuous pressure, which moves teeth and changes the shape of the bone.
Step-by-step explanation:
The correct answer is option 1) Braces. Orthodontic fixed appliances are commonly known as braces. These devices are used by orthodontists to correct misalignments of the teeth and bite. The braces apply continuous pressure over a period of time, moving teeth in a specific direction.
As the teeth move, the bone changes shape due to the pressure applied. The wires, which may be made of metal, ceramics, or other materials, serve as a track to guide the teeth to their new positions.
Braces include brackets cemented to the teeth and connected by a wire that the orthodontist tightens and adjusts to gradually realign the teeth.
The other options listed such as separators, Hawley retainers, and clear aligners are also orthodontic devices but serve different purposes.
Separators or spacers are used to create space between teeth before braces are applied. Hawley retainers are removable devices used after braces are removed to maintain the position of straightened teeth.
Clear aligners, like Invisalign, are an alternative to traditional braces that use clear, plastic forms to gradually move teeth.