title: The key to accuracy of zygoma repositioning: Suitability of the SynpliciTi customized guide-plates.
abstract: This study aimed at assessing the suitability and accuracy for secondary zygoma repositioning of custom-made drilling guides and plates designed from a computer-assisted reversed planning. Mini-plates and pre-drilling guides were designed starting from the virtual planning of the repositioned zygoma. The pilot holes were drilled first during surgery. The zygoma was repositioned by inserting the screws in the pilot holes using the custom-made plates. Surgical planning and postoperative CT-scan were superimposed. The distances between each point of the planned and final zygoma positions indicated the accuracy of repositioning. We included 11 zygoma repositioning procedures in 10 consecutive patients. The medians of the distances between the planned and final zygoma positions in this cohort ranged from 0.05 mm to 0.38 mm (0.20 mm on average). 93%, 81%, and 57% of the points of the planned and final zygoma were less than 2 mm, 1 mm, and 0.5 mm away, respectively. The SynpliciTi customized guide-plate system allowed achieving highly accurate zygoma repositioning in short operative times in this series, without the need for expensive equipment with difficult implementation. Larger cohorts are needed to assess the overall benefit and cost-effectiveness of the SynpliciTi.
authors.affiliation: APHP - Pitie-Salpetriere University Hospital, Department of Oral and Maxillofacial Surgery, 47 Boulevard de l'Hopital, F-75013 Paris, France. Electronic address: Thomas.schouman@psl.aphp.fr.
authors.forename: Thomas
authors.initials: T
authors.lastname: Schouman
authors.affiliation: APHP - Pitie-Salpetriere University Hospital, Department of Oral and Maxillofacial Surgery, 47 Boulevard de l'Hopital, F-75013 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, F-75005, Paris, France.
authors.forename: Gregory
authors.initials: G
authors.lastname: Murcier
authors.affiliation: APHP - Pitie-Salpetriere University Hospital, Department of Oral and Maxillofacial Surgery, 47 Boulevard de l'Hopital, F-75013 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, F-75005, Paris, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Goudot
mesh_terms: D001860:Bone Plates; D006801:Humans; D025321:Surgery, Computer-Assisted; D014057:Tomography, X-Ray Computed; D015050:Zygoma / Q000601:surgery*
keywords: Computer assisted surgery; Computer-assisted manufacturing; Malunited fracture; Zygomatic fracture