Prosthesis design method and system based on arch line

A prosthesis design method using a prosthesis design system, the prosthesis design system including an oral scanner scanning a patient's oral cavity and a prosthesis design computing device designing a virtual prosthesis based on oral scan data provided from the oral scanner, comprising:

• acquiring 3D oral model data based on an image including the oral scan data;
• displaying an oral image of the 3D oral model data together with an arch line outside an oral image;
• aligning the oral image with the arch line and then displaying the oral image aligned with the arch line;
• acquiring oral information by analyzing the oral image aligned with the arch line with reference to the arch line and an alignment relationship of the oral image;
• determining at least one dentate region to be restored on the oral image;
• determining a prosthesis type of a virtual prosthesis to be designed in the determined dentate region;
• determining a margin line of the determined dentate region;
• determining an insertion axis direction which is a direction in which the virtual prosthesis is inserted into the oral image;
• designing the virtual prosthesis in accordance with a determined prosthesis design parameter;
• displaying the designed virtual prosthesis to overlap the dentate region of the oral image;
• locating the designed virtual prosthesis on the oral image and displaying the oral image on which the virtual prosthesis is located;
• and
• providing an interface for manually correcting the virtual prosthesis.