The X-ray photographs of 400 cases of mandbular impacted third molar were observed and the impactedmolar types and relations between impacted types and complications of impacted tooth were analysed.
通过400例下第三磨牙的X 线片观察，分析了阻生齿的阻生类型，阻生类型与阻生齿并发症的关系。
2
Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .
较常见的是尖牙和上颌切牙的埋伏阻生（第三磨牙除外）。
3
Purpose: the purpose of this study was to investigate the feasibility and advantage of extracting the impacted mandibular third molar via resection of lingual bone plate.