Quantification of facial asymmetry: A comparative study of landmark-based and surface-based registrations.
J Craniomaxillofac Surg
; 44(9): 1131-6, 2016 Sep.
Article
em En
| MEDLINE
| ID: mdl-27519663
ABSTRACT
OBJECTIVE:
To compare the validity and reproducibility of four different methods for the quantification of soft tissue facial asymmetry. MATERIAL ANDMETHODS:
Twenty 3D-photographs were randomly selected from the healthy control database. To assess the validity of the one landmark-based and three surface-based methods for measuring asymmetry, artificial facial asymmetry was created on two 3D photographs. The discrepancy between the artificial facial asymmetry and the asymmetry quantified by different methods was calculated. To evaluate the reproducibility of the methods, they were applied three times by two independent observers. The intraobserver and interobserver variations were calculated.RESULTS:
The mean absolute differences between the measured asymmetry and the artificial asymmetry for the landmark-based method, forehead method, 5 mm method and 1 mm method were 1.4 mm, 0.3 mm, 0.09 mm and 0.06 mm respectively. The intraobserver and interobserver variations for the forehead, 5 mm and 1 mm methods were between 0.18 mm and 0.34 mm.CONCLUSION:
The surface-based methods were valid and highly reproducible in comparison to the landmark-based method for the quantification of soft tissue facial asymmetry. The 1 mm surface-based method can be implemented in a clinical and research setting to quantify facial asymmetry.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Processamento de Imagem Assistida por Computador
/
Fotogrametria
/
Imageamento Tridimensional
/
Assimetria Facial
Limite:
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Craniomaxillofac Surg
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Holanda