几何学的

Methods X-ray dental film and panoramic pantomogram were used to determine the location of embedded supernumerary teeth on bases of the geometrical principle of X-xay photography.

方法通过拍摄X线牙片及全景片,结合临床检查,利用X射线照几何学原理确多生牙位置,以确手术入路,然后拔除。