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本文就２３４例急性冠周炎与下颌阻生第三磨牙的相关因素进行了临床研究，结果，冠周炎与垂直阻生牙的关系最为密切，占７９％。其中，冠周龈瓣覆盖１／２以上者占６４％，覆盖１／２以下者占３６％；平平面者占６６％，低平面者占３０％，高平面者占４％；有对牙者占６６％，无对 牙者占３４％。垂直阻生牙的这三项指标与其他阻生类型相比及其内相比均具有显著性差别，表明平和低平面的垂直阻生牙冠周龈瓣覆益１／２以上且存在对牙者比高平面和冠周龈瓣复盖１／２以下者或更易罹患急性冠周炎。
In this paper, 234 cases of acute periarthritis and impacted mandibular third molar clinical factors related to the results, pericoronitis and vertical occlusion of the most closely related teeth, accounting for 79%. Among them, the crown gingival flap covering more than 1/2 accounted for 64%, covering 1/2 or less accounted for 36%; flat plane accounted for 66%, low plane accounted for 30%, high plane accounted for 4%; with teeth 66%, non-dental accounted for 34%. The three indexes of vertical impacted teeth have significant differences compared with those of other implants, indicating that the flat and low-level vertical impacted crowns of gingiva covers more than 1/2, Who than the high plane and the gingival flap covering more than 1/2 or more likely to suffer from acute pericoronitis.