Preparation guide plate and removable partial denture support model construction method and fabrication method

A method for constructing a preparation guide plate model, the method comprising:

• step 1:
• simulating implant placement in CBCT data of an oral cavity having an edentulous region, and determining an implant placement site and an implant placement direction, to obtain CBCT data including the implant placement site and being marked with the implant placement direction;
• step 2:
• in oral scan data of the oral cavity having the edentulous region, generating a simulated implant and marking a direction of an insertion path for a removable partial denture based on the implant placement site and the implant placement direction that are obtained in step 1, the direction of the insertion path being consistent with the implant placement direction;
• step 3:
• in the oral scan data that has been processed in step 2, taking a plane where the direction of the insertion path is located and which is tangent to an inner side of an adjacent tooth as a reference guide plane, translating the reference guide plane to a portion close to the inner side of the adjacent tooth and inserting the reference guide plane into the adjacent tooth without changing a direction of the reference guide plane, to form an intersection plane of the reference guide plane and the adjacent tooth, wherein adjacent tooth local data is stored on a side of the intersection plane close to the edentulous region, the adjacent tooth local data is a region to be removed, and the intersection plane forms a guide plane of the inner side of the adjacent tooth;
• and when a plurality of adjacent teeth is present, the plurality of adjacent teeth is successively processed to form a corresponding guide plane on an inner side of each of the plurality of adjacent teeth;
• and
• step 4:
• generating the preparation guide plate model based on the oral scan data that has been processed in step 3, wherein the preparation guide plate model comprises a structure covering the edentulous region and a structure covering the adjacent tooth, wherein a thickness of a structure covering the region to be removed on the structure covering the adjacent tooth is smaller than a thickness of a structure covering a remaining region of the same adjacent tooth, a thickness gap surface between the structure covering the region to be removed and the structure covering the remaining region of the same adjacent tooth covers a local portion of the guide plane of the inner side of the adjacent tooth, and the thickness gap surface is a plane structure having a same direction as a direction of the guide plane of the inner side of the adjacent tooth.