Thomas Hierl1, Hans-Martin Doerfler2, Heike Huempfner-Hierl3, Daniel Kruber4. 1. Head of Department, Department of Oral & Maxillofacial Plastic Surgery, Helios Vogtland-Klinikum Plauen, Plauen, Germany. Electronic address: Thomas.Hierl@helios-gesundheit.de. 2. Engineer, Faculty of Mechanical and Energy Engineering, University of Applied Sciences (HTWK), Leipzig, Germany. 3. Head, Department of Oral & Maxillofacial Plastic Surgery, Helios Vogtland-Klinikum Plauen, Plauen, Germany. 4. Computer Scientist, Faculty of Mechanical and Energy Engineering, University of Applied Sciences (HTWK), Leipzig, Germany.
Abstract
PURPOSE: The aim of this investigation was to generate a statistical shape model (SSM) of the midface and evaluate symmetry, gender aspects, and bone thickness. METHODS: About 102 computed tomography scans were analyzed to create the SSM. This included segmentation, landmark attribution, and Procrustes and principal component analysis. Afterward, symmetry and gender differences were visualized by registration and color coding. Bone thickness was calculated by measuring the distance between outer and inner surfaces. RESULTS: Symmetry was high in all models. The male model showed a more prominent forehead, nasal bones, and larger bizygomatic width. Bone thickness resembled the concept of vertical and horizontal maxillary pillars and buttresses. CONCLUSIONS: SSM can be used to analyze midface morphology and help in virtual surgery planning. Calculation of bone thickness could also be a useful tool in surgical planning and biomechanics.
PURPOSE: The aim of this investigation was to generate a statistical shape model (SSM) of the midface and evaluate symmetry, gender aspects, and bone thickness. METHODS: About 102 computed tomography scans were analyzed to create the SSM. This included segmentation, landmark attribution, and Procrustes and principal component analysis. Afterward, symmetry and gender differences were visualized by registration and color coding. Bone thickness was calculated by measuring the distance between outer and inner surfaces. RESULTS: Symmetry was high in all models. The male model showed a more prominent forehead, nasal bones, and larger bizygomatic width. Bone thickness resembled the concept of vertical and horizontal maxillary pillars and buttresses. CONCLUSIONS: SSM can be used to analyze midface morphology and help in virtual surgery planning. Calculation of bone thickness could also be a useful tool in surgical planning and biomechanics.