An oral maxillo-mandibular relationship reestablishment aid device, and reestablishing method and device, relating to the field of stomatology. The oral maxillo-mandibular relationship reestablishment aid device comprises: a maxillary gasket (1) used for fixing a maxillary model, wherein positioning marks (2) are provided on the side surface of the maxillary gasket (1) and used for positioning the maxillary gasket (1)； a mandibular gasket (3) used for fixing a mandibular model, wherein positioning marks (4) are provided on the side surface of the mandibular gasket (3) and used for positioning the mandibular gasket (3)； a base (5) comprising an upper base (6) used for limiting the height of the maxillary gasket (1) and a lower base (7) used for placing the mandibular gasket (3)； and a support structure (8) used for fixing the upper base (6) and the lower base (7). Such an oral maxillo-mandibular relationship reestablishment aid device enables an operator to obtain a maxillary gasket (1) and a maxillary model, as well as a mandibular gasket (3) and a mandibular model, that are fixedly connected and keep a certain positional relationship, and obtain maxilla scan data and mandible scan data under a predetermined maxillo-mandibular relationship from scan data by means of the positioning marks (2, 4), thereby reducing the number of scans and improving the efficiency and precision.L'invention concerne un dispositif d'aide de rétablissement de relation maxillo-mandibulaire oral, un procédé et un dispositif de rétablissement, se rapportant au domaine de la stomatologie. Le dispositif d'aide de rétablissement de relation maxillo-mandibulaire oral comprend : un joint d'étanchéité de maxillaire (1) utilisé pour fixer un modèle de maxillaire, des repères de positionnement (2) étant prévus sur la surface latérale du joint d'étanchéité de maxillaire (1) et utilisés pour positionner le joint d'étanchéité de maxillaire (1) ； un joint d'étanchéité de mandibule (3) utilisé pour fixer
