The system has a form of a movable and fixable structure node, equipped with hinges and/or pins. It consists of a head bush adapted to be fixed in an articulator, said head bush consisting of the dish (1), the lid (2), of the hub (3) with an internal through-orifice, of the ball pin (4), of the cylinder (5), of the plate (6), and of the control element (7). In case the fixation is required, the control element (7) contacts the plate (6) which pushes on the cylinder (5). Said cylinder (5) acts on the ball pin (4) and the force from the ball pin (4) is transferred further on the hub (3) to ensure its fixation against the dish (1). In a variant it can be completed with a counterpart having shape of the structure element (9) which contains the disk plate (109) on the opposite side of which two pairs of movable plates (104) are fixed and equipped with an internal longitudinally-shaped opening. The arrested screw (105) passes through the internal openings of the movable plates (104). In another variant it can be completed with a calibrating pillar which contains two disks (201, 201a) joined with the movable bottom element (203) and with the movable top element (203a) which are joined with a set of ball hinges (202, 202a, 206).Linvention concerne un système qui a la forme dun nœud de structure mobile et pouvant être fixée, équipé de charnières et/ou de broches. Il comprend une douille de tête conçue pour être fixée dans un articulateur, ladite douille de tête comprenant le support (1), le couvercle (2), lembout (3) ayant un orifice traversant interne, la broche à bille (4), le cylindre (5), la plaque (6) et lélément de commande (7). Si une fixation est nécessaire, lélément de commande (7) entre en contact avec la plaque (6) qui pousse le cylindre (5). Ledit cylindre (5) agit sur la broche à bille (4) et la force provenant de la broche à bille (4) est transférée davantage sur lembout (3) pour assurer sa fixation contre le support (1). Dans une variante, il peut également êt
