Measurements of zygoma conformity according to presurgical planning. The infraorbital foramen (yellow asterisk) and base of zygomatic arch (red asterisk) were identified on CT. The five points (Z1, Z2, Z3, Z4, and Z5) (violet points) on the zygomatic surface were defined and evenly distributed based on its angle of degree. The O point (yellow point) is defined as the intersection of the vertical midline and the horizontal line that passed through the bilateral zygoma arch base. The Z1O line (yellow dotted line) that intersected at the surface of the zygoma object during presurgical planning is defined as P1 (green point). The other points P2 to P5 (green points) are defined in the same manner. The preoperative and postoperative distances to virtual planning images between Z1 and P1, Z2 and P2, Z3 and P3, Z4 and P4, and Z5 and P5 were measured.