Stellzig A, Basdra E K, Komposch G
Poliklinik Für Kieferorthopädie, Klinik für Mund-, Zahn- und Kieferkrankheiten, Universität Heidelberg.
J Orofac Orthop. 1996 Oct;57(5):288-97. doi: 10.1007/BF02197549.
The aim of this study was to evaluate treatment results after extraction of maxillary second molars. Since this therapy was chosen in patients with class II malocclusion, deep overbite and counterclockwise growth pattern, its effects on overbite and correction of the malocclusion were examined. For this purpose pre- and post-treatment models of 25 patients with 48 extracted upper second molars were measured and lateral cephalograms were appropriately superimposed in order to determine maxillary and mandibular skeletal and dentoalveolar changes. Our results indicate an average overbite reduction from 4.7 mm to 2.7 mm. None of the patients showed a posttreatment overbite increase. Despite the considerable initial Class II relation in many cases, a Class I occlusion was achieved in 92% of the patients. Primarily, the correction was achieved by distalization of the upper first molars. Furthermore, the mesial migration of the lower first molars, skeletal changes in the lower jaw, and the growth inhibition in the upper jaw contributed to the correction of the class II malocclusion.
本研究的目的是评估拔除上颌第二磨牙后的治疗效果。由于该治疗方法适用于安氏II类错牙合、深覆牙合和逆时针生长型的患者，因此研究了其对覆牙合及错牙合矫正的影响。为此，对25例拔除48颗上颌第二磨牙患者的治疗前后模型进行测量，并对头颅侧位片进行适当重叠，以确定上颌和下颌的骨骼及牙-牙槽变化。我们的结果表明，覆牙合平均从4.7毫米减少到2.7毫米。没有患者出现治疗后覆牙合增加的情况。尽管在许多病例中初始安氏II类关系明显，但92%的患者达到了安氏I类咬合。主要通过上颌第一磨牙远移实现矫正。此外，下颌第一磨牙的近中移动、下颌的骨骼变化以及上颌的生长抑制也有助于安氏II类错牙合的矫正。
