ORTHODONTIC APPARATUS WITH DOUBLE FRONT BALL MADE ON A MODEL PREFIGURING THE POSITION OF END OF TREATMENT, SLIDING ON THE SIDE ARMS OF A FIXED EXPANSION DEVICE, SEALED ON MOLAR
orthodontic appliance fixed on two sealed rings (1) on the molars and comprising: a bihelix-type cross-loop expansion device (2), and two mesial arms (3) running along the inner faces of the teeth of the lateral sectors. On each of these arms, a sliding tube (4) is integral with a double arc (5), which has been adjusted to the lingual surface of the teeth previously aligned, or by cutting a study model tooth by tooth, and repositioning, in alignment, either by digitizing the initial template, and computer-aided prefiguration of the desired final alignment at the end of processing, and then printing the end-of-treatment template in three dimensions. The double arc sliding by the tubes on the part fixed to the rings, is pushed by elastics (6), placed by the practitioner between fixed part and double arc. Hooks (7) fixed on the outer face of the molar rings, and whose end is at the level of the buccal surface of the premolars, allow the patient to hang on each side an elastic (8) passing on the outer face, and compressing the teeth against the double arch. The position of each tooth is precisely determined by two points in lingual, and a point in the vestibular. The technical problem is to achieve a fixed device, so continuous action, acting in a precise manner on the positioning of each tooth, without attachment attached to the visible outer part of the teeth (recurrent patient demand) and without the technical complexity of bonding of fasteners on their lingual side. appareil d'orthodontie fixé sur deux bagues scellées (1) sur les molaires et comprenant : un dispositif d'expansion transversale par boucle, type bihélix (2), et deux bras mésiaux (3) longeant les faces internes des dents des secteurs latéraux. Sur chacun de ces bras, un tube coulissant(4) est solidaire d'un arc double(5), qui aura été ajusté à la face linguale des dents préalablement alignées, soit par découpage d'un modèle d'étude dent par dent, et repositionnement,
