Petersohn I
Dtsch Zahnarztl Z. 1980 Feb;35(2):301-2.
600 persons with malocclusion were examinated to clear the hypothesis if one-side untimely extraction of the deciduous canine teeth will cause a displacement of the front median line towards the extraction side. 70 patients had untimely extractions in the maxilla, 53 in the mandibula. These patients showed an increased median displacement of the front median line towards the extraction side. Therefore, it is immportant to point to the demand for symmetric extraction.
对600名错牙合患者进行了检查，以验证乳牙单侧过早拔除是否会导致前正中线向拔牙侧移位这一假设。70名患者上颌乳牙过早拔除，53名下颌乳牙过早拔除。这些患者前正中线向拔牙侧的移位增加。因此，强调对称拔牙的必要性很重要。
