Auxiliary device, auxiliary device assembly and intraoral three-dimensional graph acquisition method

The invention discloses an auxiliary device, an auxiliary device assembly and an intraoral three-dimensional graph acquisition method. The auxiliary device is used for assisting an intraoral three-dimensional scanner to acquire an intraoral three-dimensional graph and comprises a connecting part, a feature part and a feature pattern, wherein the connecting part can be mounted on a fixed body; the feature part is connected to the connecting part and is of a sheet-shaped structure; the feature pattern is arranged on the feature part; and when the connecting part is mounted on the fixed body, the feature part is vertically or obliquely arranged relative to an alveolar ridge, so that a mucous membrane of the alveolar ridge can be exposed. According to the auxiliary device disclosed by the embodiments of the invention, the feature part is provided with the feature pattern, the mucous membrane of the alveolar ridge is exposed, and when the intraoral three-dimensional scanner is used for carrying out scanning, accur