Dentition defect partition pressure impression individual tray designing and making method

The invention relates to a dentition defect partition pressure impression individual tray designing and making method. The method comprises the steps that a preliminary impression is made, and a plaster model is filled; the preliminary impression or the plaster model is scanned; scanning data is called into reverse engineering software, and three-dimensional point cloud data is extracted; an undercut area is filled and leveled up; agomphosis area data is uniformly enlarged for 1-3 mm along the data surface normal, and residual dentition data is uniformly enlarged for 0.5-1 mm to obtain a virtual tray body portion; the thickness is uniformly increased for 1-3 mm along the virtual tray inner surface normal; a hole for impression material overflow and retention is reserved in the tray surface in a residual dentition corresponding area; the virtual tray body portion is fused with a data boundary of a handle, and an impression individual tray is made through a 3D printing device. The pressures of an agomphosis area alveolar crest and a residual dentition in final impression making can be accurately and quantitatively controlled according to the material characteristics of different final impression materials, traditional manual making is replaced, and improvement of the designing and making accuracy of removable partial dentures is promoted.