PURPOSE: To enable correction repeatedly even when regaining a desired shape is impossible by one operation by a method wherein a paste-like photosetting resin is applied in a desired shape at a part to be repaired of a dental technician's working model and then, the paste-like photosetting resin is irradiated with a light beam to harden.

CONSTITUTION: A specified amount of a paste-like photosetting resin 3 is applied on a broken member 2 of a tooth part 1a of a dental technician's working model 1 broken partially to make a specified shape. Then, the paste-like photosetting resin 3 is irradiated with a light beam using a light beam irradiator 4. The light beam irradiation conditions varies with the type of lamps of the light beam irradiator 4 and as standard, the lamps of 85-1,300w, an irradiation distance of 1-5cm and irradiation time of about 90-300sec are preferable. As a result, the paste-like photosetting resin 3 is hardened to accomplish the repairing of the broken part 2. This enables the finishing of the part to be repaired to a desired shape.