An offshoot of the training appliances we use in Myofunctional work, the developer has designed a series of appliances for adults as well. Worn just 2 hours a day and at night, they can be an excellent alternative for patients who don't want more conventional approaches. They can help with sleep breathing and jaw joint issues as well.
Active Plates ("Retainers")
Most people call them retainers because they look like what people wear when their braces come off to retain the position of the teeth. But these are designed with springs and screws and clasps that move the teeth like braces do. Their action is limited, but they do have their place.
They can be modified for use in dento-facial orthopedics (more).