Most commonly used in growing patients. They can be applied more slowly with adult patients or sometimes in combination with a surgical procedure. Expanders are cemented usually but can be made in a removable form too (if you promise not to lose it!). The expander has a small keyhole, that when turned backwards will expand the roof of your mouth out laterally. This is considered an orthopedic correction, used to treat crossbites and can be made for lower teeth, as well.
This appliance is used to prevent drifting of back molar teeth when the baby teeth in front of them fall out. A lower holding arch is designed to maintain and preserve the length of the dental archform, so it is a great method to prevent crowding. It is glued in and just sits passively in floor of the mouth.
This appliance is basically the upper version of the lower holding arch. The Nance design has a plastic button that rests on the roof of your mouth, while the transpalatal arch runs across but doesn't reach that far up. Similarly, for the most part, these are made to prevent forward drifting of adult molar teeth.
These appliances are orthopedic correctors (aka change the way you grow) in the side/profile dimension. Because they are worn outside of the mouth, you only wear at home and to bed. Unless you really like the look, go for it!
This protraction facemask design is used to try and treat skeletal Class III malocclusions. They pull the upper jaw forward, with hopes to outcompete the growth in the lower jaw.
There are several devices that aim to encourage lower jaw growth, and have what we like to call a "headgear effect". Many are removable, so again you really have to wear it if you want it to work. In case you didn't realize, these are also intended for patients that are in the growing phases of their lives.
These are pretty much rubber bands that are worn across a series of teeth to improve the position and relation of the teeth. If worn FULL-TIME, you can be out of treatment in no time! There are many different designs, but here are a few:
Class II: designed to combat against the Class II Malocclusion, pulling the lower jaw forward and upper jaw back
Class III: total opposite, to combat against the Class III Malocclusion, which pulls the upper jaw forward and lower jaw back