Screw channel insertion piece forms the support dental device of the screw channel of casting mold. The insertion piece (2) includes that matrix (9) are fixed to simulation implantation material (s) (8) by screw (6) via interface (5), Internal Audit Section (10) is mounted on (9) and termination ring (11) on matrix, each there is through hole, at the center point. Interior zone (10) includes that spherical ring (12) is assemblied in or is mounted on each other. Ball-type ring (12) and terminating ring (11) be cylinder symmetric element have form substantially spherical segment at least in its assembled portion. In addition, ball collar (12) and ring (11), which terminate to be fit, enters bending in each other, thus when implantation material (8) are simulated towards oral cavity in the opposite end of the screw slot (1) that dental apparatus (3) complete hole.
