| 摘要 |
An orthodontic appliance for moving the upper teeth relative to lower teeth in either a backward or a forward direction contains a resilient body coupled to at least one rotating end portion that allows the device to spin freely. Since the ends of the device spin freely, the stress of twisting on the flexible portion will be eliminated thus reducing breakage. Furthermore, the need for a different right and left device is eliminated. In addition, the end portion may also be telescoping in order to make the device expandable, thus allowing the patient to open his/her mouth more fully which results in the additional benefit of less appliance breakage. Also, because the device is expandable, the flexible portion can be made one size that will result in a more consistent force output and reduce the number of parts needed to manufacture the appliance.
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