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本文目的是研究在用Frankel矫正器(FR—1或FR—2)矫治安氏Ⅱ类错(牙合)时牙弓扩张的潜力,特别要回答下列问题。同一群体中,矫治与未矫治的Ⅱ类错(牙合)患者相比,矫治者的牙弓可以扩大多少?就上下牙弓而言,哪个牙弓扩大得更多?矫治开始时,属于牙弓较窄者是否比属于牙弓较宽者扩大得更多? Frankel矫治期限与扩弓量之间是否有关? 107名Ⅱ类错(牙合)患者作为研究对象。矫治组60名,均戴用功能性Frankel矫正器,头
The purpose of this article is to investigate the potential of dental arch expansion in the treatment of Class II malocclusion using the Frankel orthotic (FR-1 or FR-2), in particular to answer the following questions. Which dental arch can be enlarged more than the uncorrected type II malocclusion in the same population? Which dental arch enlarges more for the upper and lower dental arch? Is there a relationship between Frankel's duration of correction and the amount of expansion? 107 patients with type II malocclusion were considered as subjects. The correction group of 60, wearing functional Frankel appliances, head