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上颌前、中段牙弓狭窄,导致前牙深覆、深覆盖、牙列拥挤重叠、下颌后退等畸形。也是颞颌关节疾患的潜在因素。故增大牙弓宽度是矫治成败的关键。本文对25例基骨发育良好,腭中缝尚未完全闭锁的儿童,以铰链式扇形矫治器进行快速扩大牙弓,效果满意,现将其方法和结果报告如下。对象与方法一、对象:25名(10～11岁6名,～12岁13名,～13岁6名),其中属安氏分类Ⅰ类的13名,Ⅱ类12名。临床主要表现为上颌前、中段牙弓狭窄拥挤,牙列拥挤程度在7mm左右。
Narrow arch of the maxillary anterior, middle, leading to deep anterior teeth cover, deep coverage, overlapping crowded dentition, mandibular retraction and other deformities. It is also a potential factor for temporomandibular joint disorders. Therefore, increasing the width of dental arch correction is the key to success. This article 25 cases of well-developed basement, palatal suture has not yet fully closed children with hinged fan-shaped appliance rapid expansion of the dental arch, the results are satisfactory, the methods and results are reported as follows. Subjects and Methods I. Subjects: 25 (6 children aged 10 to 11, 13 to 12, and 6 to 13), of which 13 were classified as Class I and 12 were Class II. The main clinical manifestations of the maxillary anterior and middle dental arch narrow crowded, crowded dentition about 7mm.