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Zygomatic bone shape in intentional cranial deformations: a model for the study of the interactions between skull growth and facial morphology

Type
Articles dans des revues avec comité de lecture
Author
KETOFF, Serge
1001017 Institut de Biomecanique Humaine Georges Charpak [IBHGC]
GIRINON, François
1001017 Institut de Biomecanique Humaine Georges Charpak [IBHGC]
SCHLAGER, Stefan
68615 University of Freiburg [Freiburg]
FRIESS, Martin
7512 Muséum national d'Histoire naturelle [MNHN]
SCHOUMAN, Thomas
1001017 Institut de Biomecanique Humaine Georges Charpak [IBHGC]
ROUCH, Philippe
1001017 Institut de Biomecanique Humaine Georges Charpak [IBHGC]
KHONSARI, Roman Hossein
472173 Service de Stomatologie et Chirurgie Maxillo-facial [CHU Pitié-Salpêtrière]

URI
http://hdl.handle.net/10985/18136
DOI
10.1111/joa.12581.
Date
2016
Journal
Journal of Anatomy

Abstract

Intentional cranial deformations (ICD) were obtained by exerting external mechanical constraints on the skull vault during the first years of life to permanently modify head shape. The repercussions of ICD on the face are not well described in the midfacial region. Here we assessed the shape of the zygomatic bone in different types of ICDs. We considered 14 non-deformed skulls, 19 skulls with antero-posterior deformation, nine skulls with circumferential deformation and seven skulls with Toulouse deformation. The shape of the zygomatic bone was assessed using a statistical shape model after mesh registration. Euclidian distances between mean models and Mahalanobis distances after canonical variate analysis were computed. Classification accuracy was computed using a cross-validation approach. Different ICDs cause specific zygomatic shape modifications corresponding to different degrees of retrusion but the shape of the zygomatic bone alone is not a sufficient parameter for classifying populations into ICD groups defined by deformation types. We illustrate the fact that external mechanical constraints on the skull vault influence midfacial growth. ICDs are a model for the study of the influence of epigenetic factors on craniofacial growth and can help to understand the facial effects of congenital skull malformations such as single or multi-suture synostoses, or of external orthopedic devices such as helmets used to correct deformational plagiocephaly.

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