초록 ▼

An extraoral force-reaction device engageable with the wearer\s head and/or neck, such as a headcap or a neckband, is connected to an intraoral force-applying device, such as molar bands, by force-producing means, such as springs. Snapback of the force-applying means is controlled in response to rel

An extraoral force-reaction device engageable with the wearer\s head and/or neck, such as a headcap or a neckband, is connected to an intraoral force-applying device, such as molar bands, by force-producing means, such as springs. Snapback of the force-applying means is controlled in response to relative movement of the intraoral means and the extraoral force-reaction means away from each other beyond a predetermined maximum limit, or in response to stressing of the force-producing means beyond a predetermined maximum degree of force exerted by the force-producing means. Snapback control may be effected by latching of a limit latch to prevent or limit return movement of the force-reaction device and the force-applying device, or disconnectible means can be disconnected to interrupt the application of primary force to the intraoral means and reaction force to the head or neck engageable means. The force to be exerted by the spring force-producing means can be readily adjustable in predetermined increments, such as by engagement of different holes in a spring anchor strap with an anchor pin, or by a linear ratchet device. Also, various components of the extraoral force-reaction device can be assembled and adjusted as to length by connection of separable connections, which may include linear ratchet means.

대표청구항 ▼

In an orthodontic appliance including force-reaction means, orthodontic force-applying means and a resilient connection connecting the force-reaction means and the force-applying means and having a resilient force-producing unit, the improvement comprising a disengageable connection connected to the

In an orthodontic appliance including force-reaction means, orthodontic force-applying means and a resilient connection connecting the force-reaction means and the force-applying means and having a resilient force-producing unit, the improvement comprising a disengageable connection connected to the resilient force-producing unit and having interengageable elements disconnectible without structural injury by movement of the force-reaction means and the orthodontic force-applying means away from each other exceeding a predetermined distance, said interengageable elements when disconnected being again interengageable to restore the same connection, and the resilient force-producing unit including helical compression spring means.