Nishida Tomoko, Miyamoto Yutaka, Tomonari Hiroshi
Tsurumi University, Yokohama, Department of Orthodontics, Tsurumi University School of Dental Medicine, Japan.
Tsurumi University, Yokohama, Department of Orthodontics, Tsurumi University School of Dental Medicine, Japan.
Int Orthod. 2019 Dec;17(4):806-816. doi: 10.1016/j.ortho.2019.08.021. Epub 2019 Aug 30.
The treatment of skeletal deep bite does not remain stable. The patient was a Japanese woman aged 16 years and 10 months. Her chief complaint was maxillary protrusion. The degree of overjet was + 10.5 mm and overbite was + 5.0 mm; the intermolar relationship was Angle Class II. An excessive curve of Spee was observed in the mandibular arch. A hypodivergent skeletal pattern was indicated by a small mandibular plane angle and gonial angle. The maxillary incisors were proclined and the mandibular incisors were retroclined. Based on the above findings, the patient was diagnosed with Angle Class II maxillary protrusion and deep bite with hypodivergency. Both maxillary first premolars were extracted and orthodontic treatment was performed using multi-bracket appliances. A proper overbite was achieved by 5.0 mm intrusion of the mandibular incisors. The maxillary incisors were retracted by 11.2 mm and a proper overjet was achieved. Good treatment results were obtained without apical root resorption. After 2 years of retention, the occlusion has been well maintained. This report may constitute a remarkable suggestion for treatment of an unstable deep bite.
骨性深覆合的治疗效果并不稳定。患者为一名16岁10个月的日本女性。她的主要诉求是上颌前突。覆盖度为+10.5毫米，覆合度为+5.0毫米；磨牙关系为安氏II类。在下颌牙弓中观察到斯皮曲线过大。下颌平面角和下颌角较小表明为低角骨性类型。上颌切牙前倾，下颌切牙后倾。基于上述发现，该患者被诊断为安氏II类上颌前突伴低角深覆合。拔除了双侧上颌第一前磨牙，并使用多托槽矫治器进行正畸治疗。通过下颌切牙压低5.0毫米获得了合适的覆合。上颌切牙内收11.2毫米并获得了合适的覆盖。获得了良好的治疗效果，且无根尖吸收。经过2年的保持，咬合维持良好。本报告可能为不稳定深覆合的治疗提供重要参考。
