| 摘要 |
Universal Vertical Hinge (UVH) made of malleable steel soldered directly on the lingual surface of an orthodontic band, the UVH is composed by an horizontal ground body ( 3, 5 ) and two vertical malleable arresting flaps ( 1, 2 ). The ground body has got a swelling ( 4 ) in its centre for the vertical insertion of the final part of the PD arch, called vertical bayonet Said two vertical malleable arresting flaps which hold the PD arch, can be straightened and re-folded several times so the PD arch can be removed in a vertical way.
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