| 摘要 |
An orthodontic end tube is described which is suitable for receiving an extension of an inner bow of a face bow orthodontic appliance. The end tube comprises a tubular member having an aperture passing therethrough which is dimensioned to receive an extension of the inner bow. The tubular member is provided with guide means along a peripheral portion of the tubular member. According to one embodiment, the guide means is embodiment the guide means is in the form of an elongated exposed groove having an open end at one end of the member. The groove extends at least partially along the length of the tubular member and is adapted to at least partially receive the extension of the inner bow. The tubular member, at the end of the tube where the groove has the open end, an end surface which is inclined relative to the axis of the tube. An inner surface portion of the aperture is exposed and positioned adjacent to and generally facing the direction of the groove. According to another embodiment, the guide means is in the form of a flared opening at one end of the aperture. Here, a V-shaped cutout is provided in the periphery of the tubular member and open at the flared end thereof, the cutout decreasing in width in a direction away from the flared end. In connection with the last embodiment, extensions having either a ball mounted thereon or a U-shaped loop are described which are adapted to engage the tubular member to both prevent excessive passage of the extension through the aperture as well as locking the extension against undesired mesial movement.
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