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下颌阻生第三磨牙拔与留的利弊究竟如何是许多学者研究的课题。本文就４０５例３０～７０岁文化层次较高的受检者的下颌阻生第三磨牙自然变化及其对邻牙的影响作一调查分析。结果表明，三种阻生牙中，尤以近中阻生牙对自身与邻牙的危害最大（Ｐ＜０．００５）。垂直阻生牙是急性冠周炎的主要病源牙，应当拔除，４０岁以后，垂直阻生牙呈可萌出的趋势且对机体的危害风险下降，应予保留。近中阻生牙诱发第二磨牙远中和缺失者呈随年龄递增且对机体的危害风险上升。应早拔除，３０岁以前拔除最佳，但在受累的第二磨牙已形成残冠残根无法修复或缺失时，可将近中阻生牙予以保留权作他用。本３９例水平阻生牙虽对邻牙危害不大，但作者亦认为应尽早拔除为佳。
The pros and cons of mandibular third molars extraction and retention is exactly the subject of many scholars' research. In this paper, 405 cases of 30 to 70-year-old subjects with higher culture impacted mandibular third molar natural changes and its impact on the adjacent teeth for a survey analysis. The results showed that the three types of impacted teeth, especially near-middle impacted teeth, had the most harm to themselves and their adjacent teeth (P <0.005). Vertical occlusion of teeth is the main source of acute pericoronitis, should be removed after 40 years of age, vertical occlusion of teeth was eruption trend and the risk of harm to the body should be retained. Proximal second impacted teeth induced tooth loss in the second molars with increasing age and the risk of increased risk to the body. Should be removed early, removal of the best before the age of 30, but the involvement of the second molars have been formed crown residual root can not be repaired or missing, you can retain the right to close the tooth for other purposes. The 39 cases of horizontal impacted teeth on the adjacent teeth less harmful, but the authors also think that as soon as possible removal is better.