1. Apparatus ( 21 ) for acquiring panoramic and teleradiographic radiographies and also capable of acquiring CBCT volumetric dental radiographies, comprising a support holding a rotary arm ( 26 ) which in its turn supports at one end a first X-ray source ( 27 ) and at the other end an X-ray detector ( 28 ) at a suitable distance for acquiring panoramic and/or CBCT volumetric images, characterized in that there is only one patient positioning system ( 25 ) , and comprising a second X-ray source ( 207 ) at a distance from the X-ray detector ( 28 ) suitable for acquiring cranial teleradiographies, wherein the X-ray detector ( 28 ) is positioned and configured to be used to acquire at least panoramic and teleradiographic images; wherein the first X-ray source ( 27 ) is configured to be removed from the X-ray path emitted by the second X-ray source; and wherein the second x-ray source ( 207 ) and the X-ray detector ( 28 ) are configured to acquire teleradiographic images.