Impactedtooth 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）。
2
Methods Fifty-nine patients with impactedtooth were taken transverse tomography by SIEMENS panoramic machine.
方法对59例上颌前部埋伏牙患者，通过SIEMENS全景机拍摄横断体层片。
3
Results 14 patients were localized successfully, and one patient was failing because the distance between the impactedtooth and the reference tooth is too close to differentiate.