Abstract: A dental treatment unit comprising: a dentist's board for interaction with a human operator, a scialytic lamp, a hydrogroup, a plurality of electronic boards connected through a BUS, a patient chair, and provided with an NFC reader configured to automatically activate the communication with at least one NFC tag carried by a human operator, when the NFC tag is close to the NFC reader at a reading range less than 10 cm, the NFC reader is configured for registering a human operator carrying the NFC tag at a first connection with the dental treatment unit.

Abstract: A method of limiting a X-ray beam, for example in connection with an extraoral radiographic apparatus, includes moving at least two blades of a blade limiting device through one actuator only, so as to produce a X-ray beam having the desired shape, wherein the actuator moves the at least two blades at the same time, in a direct way and in the same direction, even in the event of inversion of the direction of movement of the blades.

Abstract: A method of limiting a X-ray beam, for example in connection with an extraoral radiographic apparatus, includes moving at least two blades of a blade limiting device through one actuator only, so as to produce a X-ray beam having the desired shape, wherein the actuator moves the at least two blades at the same time, in a direct way and in the same direction, even in the event of inversion of the direction of movement of the blades.