A survey of currently used clear plastic appliances is given; their indications and their effectveness are described. We discuss in detail pros and cons of the appliances.
Essix appliances are preferred as retainers; to actively affect dentition they are treated with Hilliard thermopliers. The Invisalign system is described in details, a representative technique based on sequence of factory-made aligners by computer simulation of the treatment procedure.
Another systems as PrthoCaps and Simply5 systems are described as well.