Melanie Arnaud-Brachet1,2, Jean Marc Foletti3, Nicolas Graillon4,3, Katia Chaumoître5, Cyrille Chossegros4,3, Laurent Guyot4. 1. Department of Maxillofacial Surgery, Public Assistance Hospital,, University Hospital Center Conception, Marseille, France. melanie-nicole.arnaud@ap-hm.fr. 2. Service de chirurgie Maxillofaciale et plastique de la face, Hôpital Nord, chemin des Bourrely, 13915, Marseille, France. melanie-nicole.arnaud@ap-hm.fr. 3. Aix Marseille Univ, APHM, IFSTTAR, LBA, Pôle PROM, service de chirurgie maxillo-faciale, Marseille, France. 4. Department of Maxillofacial Surgery, Public Assistance Hospital,, University Hospital Center Conception, Marseille, France. 5. Department of Radiology, Public Assistance Hospital of Marseille, University Hospital Center Nord, Marseille, France.
Abstract
PURPOSE: Since prehistory, changes of the facial skeleton have been related to the modification of diet. More recent studies have shown changes in the morphology of the mandible and maxilla due to variations of strain during mastication. The temporal muscle (TM) is a strong masticatory muscle, with its insertions extending through the temporal fossa. Our objective is to observe the relations between the TM and the lateral orbital wall (LOW) which could indicate an influence of mastication on the shape of the LOW. METHODS: We conducted a retrospective study using 100 CT scans. The length of the lateral orbital wall (LLOW), the angle between LOW and the medial orbital wall (MOW), the cross-sectional areas of LOW and of the TMs were measured on both sides of each CT scan. The correlation between TMs and other three parameters was studied by Pearson correlations. RESULTS: A correlation was found between TMs and LOWs, a lower with LLOW, and a very weak and negative correlation between LOW/MOW angle. CONCLUSIONS: Anatomical knowledge about TM and investigation of masticatory strains lead us to think that mastication have minimal effect on the morphology of the LOW, only on the frontal process of zygomatic. This may explain, in part, why the LOW is the strongest wall of the orbit.
PURPOSE: Since prehistory, changes of the facial skeleton have been related to the modification of diet. More recent studies have shown changes in the morphology of the mandible and maxilla due to variations of strain during mastication. The temporal muscle (TM) is a strong masticatory muscle, with its insertions extending through the temporal fossa. Our objective is to observe the relations between the TM and the lateral orbital wall (LOW) which could indicate an influence of mastication on the shape of the LOW. METHODS: We conducted a retrospective study using 100 CT scans. The length of the lateral orbital wall (LLOW), the angle between LOW and the medial orbital wall (MOW), the cross-sectional areas of LOW and of the TMs were measured on both sides of each CT scan. The correlation between TMs and other three parameters was studied by Pearson correlations. RESULTS: A correlation was found between TMs and LOWs, a lower with LLOW, and a very weak and negative correlation between LOW/MOW angle. CONCLUSIONS: Anatomical knowledge about TM and investigation of masticatory strains lead us to think that mastication have minimal effect on the morphology of the LOW, only on the frontal process of zygomatic. This may explain, in part, why the LOW is the strongest wall of the orbit.
Entities:
Keywords:
Lateral orbital wall; Mastication; Orbit; Temporal muscle