1919年C.V.Hawley描述了一种活动的正畸保持器,最近应用于牙缺失和牙周病造成的牙列畸形的修复前治疗。这种经过改良的Hawley 夹板有重要的辅助治疗作用。夹板的设计:改良式Hawley夹板是由塑料基托,■双曲唇弓,固位卡环和■腭侧的平面板构成的。(牙合)平面板可调整使与下前牙长轴呈90°角接触,唇弓位于上颌切牙与尖牙牙冠的中1/3(图1)。当正中位及前伸、侧方运动时,平面板与 In 1919 C.V. Hawley described an active orthodontic retainer that has recently been applied to pre-repair treatment of dentition deformities caused by tooth loss and periodontal disease. This modified Hawley splint has important adjuvant therapies. Design of the splint: The modified Hawley splint is made of a plastic base, a double curved lip, a retaining snap ring, and a flat panel on the palatal side. The occlusal flat plate was adjusted to make a 90 ° angle with the long axis of the lower anterior teeth, with the labial arch located in 1/3 of the maxillary and canine crowns (Figure 1). When the median  position and forward, lateral movement,  flat panel with