Method of manufacturing overdenture and flattening guide applied thereto for manufacturing the overdenture

A method of manufacturing an overdenture, comprising:

• a first stage of obtaining an implantation information for guiding an implantation of a fixture on an alveolar bone of a target arch, wherein the alveolar bone will be worked on to have a flattened top surface, the first stage comprising:
• generating a three-dimensional planning image on a computerized display, the three-dimensional planning image includes a surface information of the target arch, a surface information of an opposing arch, and a three-dimensional information of the alveolar bone, wherein the three-dimensional information of the alveolar bone includes a flattening information for forming the flattened top surface;
• aligning the surface information of the target arch on the three-dimensional planning image generated on the computerized display, the surface information of the opposing arch, and the three-dimensional information of the alveolar bone to correspond to a preset vertical dimension;
• and
• determining the implantation information on the three-dimensional planning image generated on the computerized display by aligning a fixture inside the alveolar bone with the flattened top surface as to allow a top end of the fixture to correspond to the flattened top surface,
• a second stage of designing and manufacturing a flattening guide based on the flattening information and a surgical guide based on the implantation information by a 3D printing, wherein
• the flattening guide has an opening portion configured to guide flattening of the alveolar bone of the target arch on the basis of the flattening information;
• and
• the surgical guide has a fixing groove portion shape-matched with the target arch having the alveolar bone with the flattened top surface and a guide hole configured to guide implantation of the fixture on the alveolar bone of the target arch on the basis of the implantation information,
• a third stage of forming a temporary holder insertion portion within a temporary denture, the third stage comprising:
• installing the flattening guide on the target arch and flattening the alveolar bone with guiding of the flattening guide to form the flattened top surface;
• installing the surgical guide on the target arch, drilling the alveolar bone using the guide hole of the surgical guide to form an implantation hole in the alveolar bone with the flattened top surface, and implanting the fixture in the implantation hole;
• fixing a holder device to the fixture implanted on the alveolar bone;
• mounting the temporary denture on the alveolar bone on which the holder device is fixed, wherein the temporary denture comprises a temporary tooth portion having an outer surface occluded with the opposing arch and a temporary gum portion integrally extending from the temporary tooth portion and including a marginal groove filled with a dental resin;
• and
• engraving and curing the dental resin to form the temporary holder insertion portion corresponding to an outer surface shape of the holder device in the dental resin using an occlusal pressure;
• a fourth stage of obtaining a corrected scanning image of the temporary holder insertion portion through scanning the temporary denture and exposing a 3D surface information of the temporary holder insertion portion;
• and
• a fifth stage of manufacturing the overdenture including an artificial tooth portion, an artificial gum portion and a holder insertion portion by a 3D printing, wherein the holder insertion portion is formed based on the 3D surface information of the temporary holder insertion portion of the corrected scanning image, and wherein the overdenture includes a through hole to fix a clip detachably fastened to the holder device using a curable resin.