A face scanning and positioning structure used for a full denture includes anirregularlyshaped body, development projections, and concave portions. The irregularlyshaped bodydefines an asymmetrical face portion along an X-axis, an asymmetrical sideportion along aY-axis, and a thickness along a Z-axis. The development projections arearranged on theasymmetrical face portion and the asymmetrical side portion at predeterminedpositions. Thedevelopment projections protrude outwardly. The concave portions are arrangedon theasymmetrical face portion and the asymmetrical side portion at predeterminedpositions. Theconcave portions each have a concave shape. Through the developmentprojections and theconcave portions, the irregularly shaped body is in the form of anasymmetrical structure alongthe X-axis, the Y-axis, and the Z-axis. Through the irregular protrusions andconcave portions,the face scanning and positioning structure can effectively reduce the imageoverlay error of aspecific axis.
