type of system was by Watzinger et al. in 1997 in the reposition of zygoma fractures using a mirrored image from the normal side as a target. In 1998 the system was reported by Marmulla and Niederdellmann to track LeFort I osteotomy position as well as zygoma fracture repositioning. In 1998 Cutting et al. reported use of the system to track multisegment midface osteotomies in major craniofacial malformations. References Oral and maxillofacial surgery Computer-assisted surgery Surgery Health informatics