X线片常用于种植体植入前对受植区骨量、骨形态及相邻结构的评价。但全景片及牙片提供的二维图像,不能准确地确定种植牙位置。所以,要预先准确了解缺牙区牙槽嵴与下齿槽神经管、上颌窦的位置关系和特点,常需采用CT检查和断层摄影。CT检查因价 X-ray films are commonly used to assess the bone mass, bone morphology and adjacent structures in the implanted area prior to implantation. However, the two-dimensional images provided by the panoramic film and the tooth piece can not accurately determine the position of the dental implant. Therefore, to accurately understand in advance the lack of alveolar ridges and lower alveolar neural tube, maxillary sinus position and characteristics, often require the use of CT examination and tomography. CT examination due to price