An orthodontic appliance (1) that is particularly useful for correcting a class occlusion is disclosed. The appliance (1) includes a mounting arrangement (3) for mounting over an upper arch of a user having a front region and two arm regions extending rearward from the front region. The mounting arrangement (3) includes an outer wall (7) and an inner wall (9) and a web (11) extending there between. The outer wall (7), the web (11), and the inner wall (9) collectively define an upper channel (21) within which the upper arch and teeth of a user are received to mount the appliance (1). They also define a lower channel (23) for receiving the lower arch and teeth. The outer wall (7) has an upper portion (17) spaced forward of the upper arch teeth and gums forming an outer spacing formation (4) for holding the buccal mucosa away therefrom. The appliance (1) also includes a tongue elevator (51) on a lower portion of the inner wall (19) for raising the position of a users tongue. The appliance is made of a resiliently flexible material that when deformed out of a resting position corresponding to an arch form will tend to return to the desired arch form. Further the resilient flexibility assists fitting of the appliance.La présente invention concerne un appareil orthodontique (1) se révélant particulièrement utile pour ce qui est de corriger une occlusion de classe. Lappareil (1) comprend un dispositif de fixation (3) permettant de le fixer sur larcade dentaire supérieure dun utilisateur. Il comporte une partie avant et deux parties en forme de bras se prolongeant vers larrière à partir de la partie avant. Le dispositif de fixation (3) comporte une paroi extérieure (7) et une paroi intérieure (9), ainsi quune bande (11) rejoignant les deux parois. La paroi extérieure (7), la bande (11) et la paroi intérieure (9) définissent ensemble une gouttière supérieure (21) recevant larcade dentaire et les dents supérieures de lutilisateur pour la fixation de lappareil (1). Elles défin
