Validity and reproducibility of the 3D VECTRA photogrammetric surface imaging system for the maxillofacial anthropometric measurement on cleft patients
To validate the accuracy and reproducibility of linear measurements of three-dimensional (3D) images and to compare the measurements with the direct anthropometry method on cleft lip and palate (CLP) patients.
Materials and methods
Nineteen linear facial measurements were derived from 16 standardized surface landmarks obtained from 37 cleft patients (20 males, 17 females; mean age 23.84 years, standard deviation ± 6.02). They were taken manually with calipers and were compared with the digitally calculated distance on the 3D images captured using the VECTRA-M5 360° Imaging System with pre-marked landmarks. Another pair of 19 linear measurements were computed on the 3D images 2 weeks apart for intra- and inter-observer agreements. Statistical analyses used were paired t test, the Bland-Altman analysis, and the intra-class correlation coefficient (ICC) index.
Most of the linear measurements showed no statistically significant differences between the proposed method and direct anthropometry linear measurements. Nevertheless, bias of the 3D imaging system is present in the linear measurements of the nose width and the upper vermillion height. The measurements’ mean biases were within 2 mm, but the 95% limit of agreement was more than 2 mm. Intra- and inter-observer measurements generally showed good reproducibility. Four inter-observer measurements, the upper and lower face heights, nose width, and pronasale to left alar base were clinically significant.
Measurements obtained from this 3D imaging system are valid and reproducible for evaluating CLP patients.
The system is suitable to be used in a clinical setting for cleft patients. However, training of the operator is strictly advisable.
KeywordsOrthodontics Oral and maxillofacial surgery Cleft lip and palate Three-dimensional analysis Accuracy Reproducibility
We would like to thank Miss Najihah Lokman for her assistance in statistical analysis, Miss Roshahida Ahmad for her expertise in 3D imaging, and Madam Zuraini Ghazali, a representative from Cleft Lip and Palate Association of Malaysia (CLAPAM), who contributed to the enrolment of potential subjects.
This research was supported by the Postgraduate Research Fund by Coursework, Faculty of Dentistry, University of Malaya (PPPC/C1-2015/DGD/21), and by the University of Malaya High Impact Research Grant (UM.C/625/1/HIR/MOHE/DENT/13).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflicts of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards (IRB Reference Number: DF CD1410/0086(P)).
Informed consent was obtained from all individual participants included in the study.
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