It consists of a main articulator embodied in an extended body (1) with two identical pitches (2) whereon two spherical bearings (10) are positioned which are traversed by two bars (13) which, in turn, pass through spherical head screws (14), with these being connected to the supports (15) through respective bearings (16). A tightening screw (8) transversely mounted on the articulator (1) makes it possible to tighten the spherical bearings (10) and thus immobilise the bars (13), which, on the other end, are immobilised by the set formed by the spherical head screw (14), the bearing (16) and the support (15) itself; the latter has holes (22) through which respective nails intended for insertion into the bone pass, with these holes being oversized with respect to the nails in order to act as guides during insertion of the latter, but having the capability to be pinched during tightening of the corresponding nuts (21) for solid fixation to the nails, parallel to fixation to the corresponding bar's (13) support (15).