Application of all-NiTi mechanics combined with J-hook headgear in the treatment of an adult high angle Class I extraction case

An adult high angle Class I with bimaxillary protrusion was treated by extraction of four first premolars. Application of a rectangular NiTi archwire from the beginning of the active treatment period, in combination with J-hook headgear, was used to facilitate the vertical control and reduce the dental and lip protrusion. Satisfactory treatment results were obtained after twenty-four months, with improvement in facial profile and smile appearance. The exclusively use of NiTi wires throughout the entire treatment, together with its advantages and disadvantages are discussed.