Abstract
PETG (polyethylene terephthalate) is a very popular plastic material when it comes to manufacturing invisible orthodontic appliances. These devices are very common nowadays because they provide an esthetic treatment alternative to braces. This type of plastic material has several indications in orthodontics: manufacturing night guards, positioners, orthodontic aligners, invisible single-layer/multi-layer thermoplastic retainers, bite splints, space maintainers, mini trays, fluoride trays, growth guiding splints, etc. The polyethylene foils provide resistant wear and rigid devices, with no substantial elastic deformation, capable of assuring a reliable orthodontic treatment.
Keywords: polyethylene foils; thermoplastic retainers; orthodontic aligners