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目的:探讨片段弓矫治重度深覆牙合患者的作用机制及临床作用要点。方法:对16例成人重度深覆患者,用片段弓来打开咬合,并对咬合打开前后的硬软组织变化进行分析。结果:①戴用片段弓3～6个月(平均4.5月)后,覆牙合达到正常,切牙段出现整体压低,而对支抗后牙几乎无影响,上颌磨牙的角度、垂直距离与上颌切牙的角度均未改变。②压低上切牙时平均每月0.47mm,共压低了2.12mm,6～8周后可看见压低效果。③在观察期内,随着上中切牙的压低,上切牙唇下暴露量减少,上下唇间隙平均减小,并且上唇有下降趋势。结论:片段弓矫治深覆牙合主要依靠上下前牙的整体压低,因此片段弓适用于下颌平面角较大、前牙过长或前牙齿槽突发育过度、上下唇间隙过大、上切牙唇下暴露较多的重度深覆牙合患者。
Objective: To explore the mechanism of action and the main points of clinical application of segmental arch correction in patients with severe deep overbite. Methods: Sixteen adult patients with severe deep overgrowth were treated with segmental arch to open the bite, and the changes of hard and soft tissues before and after occlusion were analyzed. Results: ① After wearing the segment arch for 3 to 6 months (mean, 4.5 months), the overbite reached the normal level, and the total occlusion was depressed, but had no effect on the supporting posterior teeth. The angle and vertical distance of the maxillary molars The angle of the maxillary incisors did not change. ② lower average incisors 0.47mm per month, a total depression 2.12mm, 6 to 8 weeks after the depression can be seen. ③ During the observation period, with the reduction of the upper incisor, the amount of lip exposure on the incisors decreased, the gap between the upper and lower lips decreased on average, and the upper lip had a downward trend. Conclusion: The treatment of deep overbite occlusion mainly depends on the overall reduction of upper and lower anterior teeth. Therefore, the segment bow is suitable for large mandibular plane angle, long anterior teeth or overgrowth of anterior teeth odontoid process, excessive gap between upper and lower lip, Dental labial exposure more severe deep overbite patients.