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.
目的探讨应用自制套钩矫治深度埋伏牙的临床疗效。
Objective To observe the curative effects of self-made hang hooks on correcting deeply embedded teeth.
应用推荐