Method and system for constructing digital dental model with hard palate area

The invention discloses a method and a system for constructing a digital dental model with a hard palate area, a method for designing a shell-shaped dental appliance, a method for manufacturing the shell-shaped dental appliance, a method for preparing the shell-shaped dental appliance, a device for constructing the hard palate and a computer storage medium. The method for constructing comprises the following steps: acquiring a scanning dental model marked with the hard palate area; constructing a corresponding dental coordinate system according to the scanned dental model; establishing a tooth jaw plane corresponding to the bottom surface of the scanning tooth jaw model in the tooth jaw coordinate system, and projecting a gingival line and a hard palate area boundary line on the scanning tooth jaw model on the tooth jaw plane; constructing a tooth jaw bottom surface contour of the scanning tooth jaw model on the tooth jaw plane according to the gingival line and the hard palate area boundary line, and constru