Based on the theory of Hertz contact

the instant contact ellipse was represented on three-dimensional and parameterized tooth surface by using projection method or contact function. The contact ellipse and contact area were formed by delaminating the contact ellipse

rendering colors and trimming the boundary. The contact area on theoretical tooth surface was described realistically. The basis of simulation model of conjugate contact was built

and a visualization platform was provided for comparing and researching the theoretical contact simulation and the actual contact area.