摘要：

目的：探讨下颌第三磨牙（mandibular third molar, M3M）的位置与急性冠周炎发生的关系。方法：选择289例诊断为M3M急性冠周炎的患者为研究对象，对患者性别、年龄，M3M的阻生类型、萌出高度、牙冠周围软组织覆盖面积、盲袋深度及有无对颌牙的咬合创伤进行记录，并对数据进行统计学分析。结果：发生冠周炎的M3M以垂直阻生最多见（69.9%），不同阻生类型之间，冠周炎发生构成比的差异有统计学意义（P<0.05）。M3M的萌出高度、软组织覆盖面积及盲袋深度与急性冠周炎的发生相关，差异具有统计学意义（P<0.05）。结论：垂直高位阻生、牙冠周围软组织覆盖面积在51%~75%或盲袋深度深是M3M发生急性冠周炎的危险因素，这些类型的M3M建议进行预防性拔除。

关键词: 下颌第三磨牙, 冠周炎, 临床特征

Abstract:

Objective: To study the relationship between the position of the mandibular third molar (M3M) and the morbidity of acute pericoronitis. Methods: A total of 289 patients with M3M acute pericoronitis were examined. The age, gender, angulation of partially impacted M3M, the height of eruption, the covering area of the soft tissue around the crown, the depth of pericoronal pocket, and the presence of impinging maxillary third molar were recorded. The data were analyzed statistically. Results: Vertical impaction molar was the most frequent (69.9%) in M3M with pericoronitis. There was significant difference in the constituent ratio of pericoronitis among different types of impaction (P<0.05). The height of eruption, the percentage of soft tissue coverage, and the depth of the retromolar pad were correlated with the pericoronitis, and the differences were statistically significant （P<0.05). Conclusion: High vertical impaction, 51%-75% soft tissue coverage around the crown or deep pericoronal pocket are risk factors for acute pericoronitis,and these types of M3M are best treated prophylactically.

Key words: mandibular third molar, pericoronitis, clinical features

中图分类号: 

• R782