Working model to perform a dental prosthesis for a tooth stump, and method to make the working model

A working model to perform a dental prosthesis for a tooth stump, said working model comprising:

• a model mandible with teeth, made from resin by means of 3D printing, comprising at least one toothless space, corresponding to a missing tooth in said model mandible with teeth, and at least one cavity facing said toothless space;
• a model tooth stump which is placed in said toothless space and which is detachably coupled to said model mandible with teeth, said model tooth stump comprising a first end which is detachably introduced in said cavity and a second end extending from said first end and being in the form of a tooth stump;
• wherein said model tooth stump comprises two first fixing means cooperating with two complementary second fixing means for integrally attaching said model tooth stump to said model mandible with teeth in a detachable manner when said first end is introduced in said cavity;
• said model mandible with teeth comprises two straight through holes, each of said through holes being aligned with one of said first fixing means;
• and each of said second fixing means passes through one of said through holes in order to cooperate with one of said first fixing means;
• wherein said model tooth stump comprises a main body made from resin by means of 3D printing and comprising said first end and said second end, and a rigid insert which comprises said two first fixing means, said rigid insert being introduced in a housing formed at said first end in the main body, and said rigid insert being integrally attached to said main body, and wherein said two through holes in the model mandible with teeth are arranged such that the axis of a first through hole is in the apical-coronal direction and the axis of a second through hole is in a direction other than said apical-coronal direction.