An orthodontic bracket for coupling a wire arch with a tooth, including a bracket body (12, 412, 712, 912) configured for mounting on the tooth, including the bracket body (12, 412, 712, 912) a groove of wire arch (16, 216, 416, 716, 916) adapted to receive the wire arch (18) a moving element (14, 14A, 214, 414, 714, 914) hooked with the bracket body (12, 412, 712, 912) and mobile relative thereto between an open position in which the wire arch (18) can be inserted into the wire arch slot (16, 216, 416, 716, 916), and a position closed in which the movable element (14, 14A, 214, 414, 714, 914) retains the wire arc (18) in the wire arc groove (16, 216, 416, 716, 916)； and a fixing mechanism configured to fix the mobile element in at least the closed position, the fixing mechanism including an protruding portion (66, 466, 766, 966) in one of the bracket body and the mobile element, and a portion of reception (68, 68A, 468, 804, 1012) on the other of the bracket body and the mobile element, where at least a portion of the projecting portion (66, 466, 766, 966) is able to move between an expanded state and a contracted state, the protruding portion (66, 466, 766, 966) defining a first transverse dimension in the expanded state and a second transverse dimension smaller than the first transverse dimension in the contracted state, the protruding portion cooperating (66, 466 , 766, 966) in an expanded state with the receiving portion (68, 68A, 468, 804, 1012) to fix the mobile element (14, 14A, 214, 414, 714, 914) in at least the closed position, where the protruding portion includes an elás pin tico (66, 466, 766, 966) having a central axis (69) characterized in that at least a portion of the elastic pin (66, 466, 766, 966) has a first effective diameter or radius of curvature in the expanded state and it is capable of flexing so that it has a second effective diameter or radius of curvature in the contracted state smaller than the first effective diameter or radius of cur
