Method for improving positioning precision of edentulous personalized tray in oral cavity

The invention relates to a method for improving positioning precision of an edentulous personalized tray in an oral cavity. The method comprises the following steps: 1) manufacturing an edentulous preliminary impression; scanning the impression; acquiring three-dimensional data; acquiring a final impression which shall include the outer edge line of a region; acquiring an undercut-free alveolar ridge surface; acquiring an inner surface of the tray; uniformly thickening the inner surface by 2mm in a normal direction of the inner surface of the tray, and using a thickened new surface as an outer surface of the tray; separately designing hemispherical structures in a main bearing area and a subordinate bearing area of the inner surface by radii of 1.5mm; designing a handle which is parallel to a positioning path but opposite to a positioning direction; promoting data boundary fusion of the inner surface, outer surface and handle of the tray, so that complete morphological data of the edentulous personalized tray are obtained, and saving the data in an STL (standard template library) format; and manufacturing the edentulous personalized tray by virtue of 3D printing equipment. With the application of the method disclosed by the invention, a target of rapidly and accurately manufacturing the edentulous functional final impression can be achieved, and diagnosis efficiency and quality can be improved.