Physicians have relied on computerized axial tomography scans (CAT), for many years. CAT scans are an X-ray procedure that uses many different X-ray images with the help of computers to generate cross-sectional or even 3D views of internal organs and structures within the body. A knee replacement surgery, for example, would never be performed without first examining 3D imaging.
More recently however, dentists have begun to rely on 3D imaging techniques and CAT scans to provide them with a detailed view of the mouth and skull. The advantage that 3D imaging holds over regular dental x-rays is that the bone structure, bone density, tissues and nerves can be viewed clearly.