The invention relates to a customized intraoral jaw distractor, of the type that comprises two anchoring means (1, 2) fastened to the mandibular body at two fixed anchor points, located on either side of the osseous callus. Such a distractor is characterized in that it includes: a) a threaded cylindrical rail (6) connecting the two anchoring means (1, 2) b) a mobile carriage (10) guided to slide on the rail (6) and attached to the osseous segment to be distracted, said mobile carriage being provided with a worm screw (11) with a thread that complements that of the rail and engages with the latter c) a pin (12) integral to the worm screw (11) and controlling the rotation thereof, said pin, which is parallel to the rail (6), being supported by two bearings (13, 14) arranged on the mobile carriage (10), on either side of the worm screw d) at least one resilient part (15) through which said pin (12) passes and which rests against one end (16) of the worm screw (11) and against the inner wall (18) of the bearing (14) that faces said end (16). The invention can be used for reconstruction of a missing or deficient osseous segment by means of osteogenic distraction.
