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 part in its turn comprising a crossbeam (104) and rests for patients temples, wherein the rests for patients temples are formed by two arches (107) articulated with said crossbeam (104) said arches (107) lean on patients temple, blocking means of said arches being provided with control means of said blocking means, e.g. under the form of oscillating levers (135) the block occurs through shape friction generated by said blocking means at the moment of activation through said control levers.Moreover, a method of use of the craniostat is described.
