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正畸治疗后的牙列稳定性是治疗的基本目标之一,也是保持治疗成果的前提。上颌第一磨牙是理想牙关系的基石,其位置和轴倾度变化将会引起整体牙关系的变化和牙齿排列的不稳定。保持期间受持续的生长发育、增龄性变化及正畸后复发趋势等因素影响,上颌第一磨牙位置在横向、矢状向和垂直向仍在发生不同程度的改变。以下就近年来针对保持期上颌第一磨牙在三维方向上的位置变化趋势及相关原因分析的研究结果做一综述。
Orthodontic treatment of dentition stability is one of the basic goals of treatment, but also to maintain the prerequisite for the treatment outcome. The maxillary first molar is the cornerstone of the ideal dental relationship. The change of its position and axial inclination will cause the change of the overall dental relationship and the instability of the dental alignment. The duration of sustained growth and development, age-related changes and the trend of recurrence after orthodontic and other factors, the position of the maxillary first molar in transverse, sagittal and vertical changes are still varying degrees. The following in recent years for the retention period of the maxillary first molar in the three-dimensional orientation of the position of the trend and the related analysis of the results of the study are reviewed.