Reproducibility of the dynamics of facial expressions in unilateral facial palsy

Alagha, M. A., Ju, X., Morley, S. and Ayoub, A. (2018) Reproducibility of the dynamics of facial expressions in unilateral facial palsy. International Journal of Oral and Maxillofacial Surgery, 47(2), pp. 268-275. (doi: 10.1016/j.ijom.2017.08.005) (PMID:28882498)

[img]
Preview
Text
144400.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

381kB

Abstract

The aim of this study was to assess the reproducibility of non-verbal facial expressions in unilateral facial paralysis using dynamic four-dimensional (4D) imaging. The Di4D system was used to record five facial expressions of 20 adult patients. The system captured 60 three-dimensional (3D) images per second; each facial expression took 3–4 seconds which was recorded in real time. Thus a set of 180 3D facial images was generated for each expression. The procedure was repeated after 30 min to assess the reproducibility of the expressions. A mathematical facial mesh consisting of thousands of quasi-point ‘vertices’ was conformed to the face in order to determine the morphological characteristics in a comprehensive manner. The vertices were tracked throughout the sequence of the 180 images. Five key 3D facial frames from each sequence of images were analyzed. Comparisons were made between the first and second capture of each facial expression to assess the reproducibility of facial movements. Corresponding images were aligned using partial Procrustes analysis, and the root mean square distance between them was calculated and analyzed statistically (paired Student ttest, P < 0.05). Facial expressions of lip purse, cheek puff, and raising of eyebrows were reproducible. Facial expressions of maximum smile and forceful eye closure were not reproducible. The limited coordination of various groups of facial muscles contributed to the lack of reproducibility of these facial expressions. 4D imaging is a useful clinical tool for the assessment of facial expressions.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ayoub, Professor Ashraf and Alagha, Mahmoud Amir and Ju, Dr Xiangyang and Morley, Mr Stephen
Authors: Alagha, M. A., Ju, X., Morley, S., and Ayoub, A.
College/School:College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing
College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing > Dental School
Journal Name:International Journal of Oral and Maxillofacial Surgery
Publisher:Elsevier
ISSN:0901-5027
ISSN (Online):1399-0020
Published Online:04 September 2017
Copyright Holders:Copyright © 2017 International Association of Oral and Maxillofacial Surgeons
First Published:First published in International Journal of Oral and Maxillofacial Surgery 47(2): 268-275
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record