Craniostat (20) for an extraoral dental radiographic apparatus (1) comprising an upper portion (21) connected to the lower portion (22) through two rods (23) the upper portion in its turn comprising a rest (105) for patients forehead, wherein said patients forehead rest (105) has an arched shape vertically sliding (104) in a suitable seat inside a crossbeam supported by said rods (23). Moreover, a method of use of the craniostat is described.
