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目的探讨拔除下颌第3磨牙,应用多曲唇弓技术矫治骨性Ⅲ类错患者的适应证和临床应用,为骨性Ⅲ类错患者的治疗提供参考。方法选择12例恒牙期的骨性Ⅲ类错患者,年龄14～18岁。所有患者均采用拔除下颌第3磨牙的方法,应用多曲唇弓技术进行矫治,用头影测量方法将矫治前后的X线头影测量数据进行对比分析。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。下颌第1磨牙平均向远中移动2.6mm,下颌切牙平均舌向移动2.1mm,ANB角平均增加1.0°,差异有统计学意义。结论拔除下颌第3磨牙,应用多曲唇弓技术矫治,适用于生长发育减速期,下颌牙弓没有拥挤且有开倾向的轻、中度骨性Ⅲ类错患者。
Objective To investigate the indications and clinical application of removing the mandibular third molars and applying the multi-piece lip-arch technique in the treatment of patients with skeletal Class Ⅲ malocclusion so as to provide reference for the treatment of patients with skeletal Class Ⅲ malocclusion. Methods Twelve patients with skeletal class Ⅲ malocclusion were selected, aged from 14 to 18 years old. All the patients were treated with extraction of mandibular third molars. The patients were treated with multi-piece lip-arch technique. The cephalometric data before and after correction were compared by cephalometric analysis. Results After correction, the molar relationship and canine relationship were all neutral in all patients, and the anterior crossbite was relieved to reach the normal relationship between covering and covering. The mandibular first molars moved 2.6mm on average, the average lingual movement of mandibular incisors was 2.1mm, and the ANB angle increased 1.0 ° on average, the difference was statistically significant. Conclusion The removal of the mandibular third molar and the correction of multi-curvature lip arch technique are suitable for the patients with mild and moderate skeletal Class Ⅲ malocclusion without crowded and prone to mandibular arching.