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目的探讨拔除下颌第二磨牙结合多曲唇弓(MEAW)技术矫治恒牙期骨性Ⅲ类错的疗效。方法选择2005年1月至2008年2月黑龙江省口腔病防治院正畸科就诊的7例恒牙期骨性Ⅲ类错非手术患者,男3例,女4例;年龄13～16岁,平均14.3岁。所有患者均采用拔除下颌第二磨牙结合MEAW技术进行矫治,对比分析矫治前后的头影测量数据。结果矫治后所有患者磨牙关系及尖牙关系均达到中性,前牙反解除,达到正常覆和覆盖关系,所有患者的软组织侧貌得到改善。下颌第一磨牙平均向远中移动3.1mm,下颌切牙平均舌向移动2.8mm,上齿槽座点、鼻根点与下齿槽座点构成的角(ANB角)平均增加1.2°,差异均有统计学意义(P<0.05)。结论拔除下颌第二磨牙结合MEAW技术矫治,适用于下颌第三磨牙牙胚正常,下颌牙弓有拥挤需要拔牙且有开倾向的恒牙期骨性Ⅲ类错非手术患者。
Objective To investigate the curative effect of mandibular second molar removal combined with multiple curved lip arch (MEAW) in the treatment of permanent skeletal Class Ⅲ malocclusion. Methods From January 2005 to February 2008 in Heilongjiang Orthodontics Department of Orthodontics 7 cases of permanent dental skeletal Class Ⅲ malocclusion non-surgical patients, 3 males and 4 females; aged 13 to 16 years old , An average of 14.3 years old. All patients were treated with MEAW removal combined with removal of mandibular second molars. Cephalometric data were compared before and after treatment. Results After treatment, the molar relationship and canine relationship of all patients reached neutrality, the anterior ossification was lifted, and the relationship between coverage and coverage was achieved. The soft tissue appearance of all patients was improved. The first mandibular first mover moved averagely 3.1 mm distal to the mandibular incisor with an average lingual movement of 2.8 mm. The angle (ANB angle) formed by the superior alveolar locus, nasal root locus and lower alveolar locus increased by an average of 1.2 °, both of which There was statistical significance (P <0.05). Conclusions Removal of mandibular second molars combined with MEAW technique is suitable for the normal mandibular third molar tooth germ. The mandibular dental arch is crowded with non-operative permanent tooth skeletal Class Ⅲ malocclusion patients who require tooth extraction and tend to open.