Abstract: A digital dental mesh segmentation method and a digital dental mesh segmentation device are provided. The digital dental mesh segmentation method includes: receiving a digital dental mesh, including a plurality of teeth; inserting a tooth interface separator at a tooth interface of the digital dental mesh, the tooth interface separator being at a first location; receiving a three-dimensional movement signal and a three-dimensional rotation signal to move and rotate the tooth interface separator from the first location to a second location; and segmenting the digital dental mesh according to the tooth interface separator at the second location to obtain an independent digital teeth model.

Abstract: A digital dental mesh segmentation method and a digital dental mesh segmentation device are provided. The digital dental mesh segmentation method includes: receiving a digital dental mesh, including a plurality of teeth; inserting a tooth interface separator at a tooth interface of the digital dental mesh, the tooth interface separator being at a first location; receiving a three-dimensional movement signal and a three-dimensional rotation signal to move and rotate the tooth interface separator from the first location to a second location; and segmenting the digital dental mesh according to the tooth interface separator at the second location to obtain an independent digital teeth model.

Abstract: A handheld electric grinder comprises a first shell body and a second shell body. The first shell body contains an electric motor therein, and is connected to the electric motor via a drive shaft. The electric motor is driven to let the drive shaft generate a first rotating speed. A first adapter is disposed at one end of the drive shaft. The first adapter can be directly connected with accessories such as hexagonal socket, screwdriver, brush and electric grinding head, or can be connected with a connector of a speed-change gear set in the second shell body. After the speed-change gear set changes the first rotating speed to a second rotating speed, a driven shaft outputs the second rotating speed. The first adapter and the second adapter can be connected with accessories such as hexagonal socket, screwdriver, brush and electric grinding head.