一种新型支抗加强系统的应用及机理分析

介绍了一种可以拆卸的中度正畸矫治支抗加强系统。该系统主要由直径1.2mm的牙用不锈钢丝弯制成的粗唇弓组成,在需要增强支抗的矫治阶段(如尖牙远移、切牙舌移阶段),插入支抗磨牙带环上与之吻合的粗颊侧管内。粗唇弓左右两侧的交互作用以及粗唇弓和颊侧管之间的摩擦力,严格限制了支抗磨牙向近中倾斜及磨牙近中舌向扭转移动,能起到被动支抗加强效能;若在颊侧管近中端给粗唇弓加弯末端内收弯及后倾曲,尚可使磨牙进行支抗预备,即起主动支抗加强效能。粗唇弓前方位于唇系带附着点(牙合)方的口腔前庭,既不压迫牙龈、强撑口唇,也不影响患者外观和口腔功能,口腔不适感小。根据矫治需要可以随时装卸粗唇弓、灵活掌握支抗的大小。实验研究也显示在阻止磨牙近中移动方面,该系统优于腭托及唇挡。

Applicaton and mechanism analysis of a new anchorage system in orthodontics

A removable moderate anchorage system was introduced. The anchorage system consists of a heavy labial wire(1.2mm) and molar buccal tubes (inside diameter 1.2mm). If once the heavy labial wire was inserted in buccal tubes, frictional force between heavy labial wire and tubes, and reciprocity between two sides of heavy labial wire prevent molars from mesial tipping and mesial lingul rotation. If tip back bend and toe of heavy labial wire were increased, the molar anchorage preparation can be produced, this is a active reinforced anchorage. Located in vestibule of mouth, the heavy labial wire did not oppress gum, influence facial appearance, make mouth unwell. The heavy labial wire can be put on or remove at all times according to anchorage requirement. The experiment also show the removable heavy labial wire anchorage system is better than Nance palatal arch and lip bumper.