Asmaa Mohamed Helmy, Yasmeen Ahmed Nassar, Maha Mohamed Hakam And Adel Hamdy Abou-elfetouh,

ABSTRACT
The Aim Of The Study Was To Evaluate Symmetry Between Reconstructed Zygomatic Complexes And The Normal Sides Using CT. Between 2013 And 2015, 7 Patients Suffering From Unilateral Orbitozygomatic Defects Were Selected From The Out-patient Clinic Of The Oral And Maxillofacial Surgery Department, Faculty Of Dentistry, Cairo University And Computed Tomography (CT) Scan Of The Facial Bone Was Requested. The Image Acquisition Parameters Were; Axial Cuts, Minimal Slice Thickness, Minimal Slice Distance And Of A Bony Window. The Patients Underwent Reconstruction Of The Deficient Zygomas Using CAD/CAM Generated Implants. One Month Post-operative CT Was Done And Measurements Of Symmetry Were Performed Using Surgical Simulation Software (Mimics, Materialise, Leuven, Belgium). Points Representing The Maximum Lateral Facial Prominence Were Marked On The Corresponding 2D CT Images Of Both Normal And Reconstructed Sides; The Distances Between These Points And The Mid Sagittal Plan Were Measured On Both Sides. Results Measuring From The Mid-sagittal Plane, The Difference Between The Maximum Projections Of The Reconstructed And The Unaffected Sides Ranged From 0.3 Mm To 6.25 Mm With A Mean Of 2.35 Mm Conclusion Evaluation Of Symmetry Between Reconstructed Zygomatic Complex And The Unaffected Side Of The Face Can Be Simply Performed Using Computer Simulation Software And That CAD/CAM Generated Implants Can Provide A High Degree Of Accuracy In Maxillofacial Reconstruction.