Kahl-Nieke B, Gerlach K L, Hilgers R D
Poliklinik für Kieferorthopädie, Universität Köln.
Fortschr Kiefer Gesichtschir. 1995;40:117-20.
Long-term follow-up of orthopantomographs of 251 adults orthodontically treated former patients showed 113 clinically asymptomatic impacted 3rd molars in 58 patients. Radiographic assessment revealed contact of impacted 3rd molars with the 2nd molars, resorption of upper and lower 2nd molars, reduced bone height on the distal side of the maxillary and mandibular 2nd molars, as well as pathologically widened pericoronal spaces of the upper and lower 3rd molars. The comparison of the sagittal 3rd molar position in 52 impacted teeth revealed a sagittal change in all 3rd molars from post-treatment to follow-up: maxillary and mandibular 3rd molars had rotated to a more upright position and showed an increase in mesio- or distoangulation or a change of axial inclination. The lack of predicting factors such as age, period of impaction, extent of space deficiency, developmental stage, level of eruption, and bone conditions leads the authors to recommend that former orthodontic patients be recalled at regular intervals for assessment of changes in the condition and position of erupting or impacted 3rd molars.
对251名接受过正畸治疗的成年患者的曲面断层片进行长期随访，结果显示，58名患者中有113颗临床上无症状的埋伏第三磨牙。影像学评估显示，埋伏第三磨牙与第二磨牙接触，上下颌第二磨牙吸收，上颌和下颌第二磨牙远中侧骨高度降低，以及上下颌第三磨牙冠周间隙病理性增宽。对52颗埋伏牙的矢状位第三磨牙位置进行比较，结果显示，从治疗后到随访期间，所有第三磨牙的矢状位均发生了变化：上颌和下颌第三磨牙均向更直立的位置旋转，近中或远中倾斜度增加或轴向倾斜度改变。由于缺乏年龄、埋伏期、间隙不足程度、发育阶段、萌出水平和骨质条件等预测因素，作者建议定期召回 former orthodontic patients，以评估正在萌出或埋伏的第三磨牙的状况和位置变化。
