牵引钩 [铁路] draw hook
towing hook
pull hook
- 目的通过对40例牙龈型微笑的深覆牙合患者的治疗,探讨J形钩高位牵引的临床应用。
Objective To investigated the clinical value of J hook in higher traction by treatment of 40 gummy smile deep overbite patients. - 方法建立含有托槽、弓丝、前后牙牵引钩的下牙列及下颌骨有限元模型。
Methods Three-dimensional finite element model, comprising brackets, arch wire, crampable hooks , mandibular dentin and mandible, was reconstructed.