Department of Orthodontics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Am J Orthod Dentofacial Orthop. 2013 Mar;143(3):412-20. doi: 10.1016/j.ajodo.2011.10.029.
The treatment of anterior open bite often requires the use of skeletal anchorage to prevent excessive eruption of the posterior teeth and consequent downward rotation of the mandible. However, this procedure might not always be accomplished. This article reports the successful treatment of an anterior open bite and a posterior crossbite in a young boy, combining traditional techniques and involving high-pull maxillary traction to help growth to correct the skeletal Class II malocclusion without skeletal anchorage. The vertical dentoalveolar contribution of maxillary growth was also favorable to close the bite, whereas cross-elastics corrected the axial inclination of the mandibular posterior teeth, eliminating the inverted posterior crossbite. The open bite was completely closed with edgewise appliances, which also achieved normal overjet, intercuspation, and incisor exposure on smiling. Traditional mechanics for the treatment of open bite and crossbite remain a useful alternative when patients do not accept skeletal anchorage.
前牙开颌的治疗常需要使用骨骼支抗来防止后牙过度萌出,从而避免下颌后下旋转。然而,并非所有情况下都能成功使用这种方法。本文报道了一例青少年前牙开颌及后牙反颌的成功治疗案例,采用传统技术,结合上颌高位牵引,以帮助生长来纠正骨骼 II 类错颌,无需骨骼支抗。上颌生长的垂直牙牙槽贡献也有利于关闭咬合,而交叉弹性体则纠正了下颌后牙的轴向倾斜,消除了反颌。使用方丝弓矫治器完全关闭了前牙开颌,同时也恢复了正常的覆颌、覆牙合和微笑时的切牙暴露。当患者不接受骨骼支抗时,传统的开颌和反颌治疗方法仍然是一种有用的替代方法。