关键词: 埋伏牙, 锥形束CT, 全景断层摄影, 三维成像

Abstract:

Objective    To evaluate the value of cone beam computed tomography in locating the embedded teeth in jaws. Methods    From September 2009 to March 2010，28 patients （15 males and 13 females，aged from 9 to 33 with the mean of 14.2 years），whose embedded tooth's shape，size and relation with adjacent teeth couldn't be judged clearly according to the panorama and locating films，were scanned by cone beam computed tomography. The three-dimensional images，multiplane reconstruction and panoramic images from different directions were obtained after original data was processed by workstation. Results    The dental surface shape，size，eruption orientation，labial or palatal location，and relation with adjacent teeth of the embedded tooth in jaws could be demonstrated clearly by the images of cone beam CT， and with the help of these images of cone beam CT，26 embedded teeth were successfully extracted by the appropriate surgical approach for supernumerary teeth，distorted teeth and inverted teeth in 18 patients，while 10 embedded teeth of non- inverted teeth were done by orthopedics in 10 patients. The diagnoses were completely confirmed by surgery with accuracy of 100% in all cases. All patients were well healed with no infection and injury to adjacent teeth. Conclusion    Cone beam CT images can provide direct and accurate images of the location of the embedded tooth，which provides dependable information for clinical diagnosis and therapy.

Key words: the embedded tooth；cone beam computed tomography；panorama；three-dimensional image