Validity of the 3D VECTRA photogrammetric surface imaging system for cranio-maxillofacial anthropometric measurements

Background:Le Fort I osteotomy imparts significant changes to the nasolabial region. Past studies have relied on 2-dimensional data and have not delineated differences among various Le Fort I subtypes. The purpose of this study is to 3-dimensionally analyze Le Fort I–induced nasal and lip changes comparing advancement alone versus widening alone [surgically assisted maxillary expansion (SAME)] versus advancement and widening. We hypothesize that the combination of maxillary advancement with widening will result in the most profound changes.Methods:A retrospective cohort study was performed. Included Le Fort I patients were grouped as: (1) nonsegmental straight advancement, (2) widening without advancement, and (3) segmental advancement and widening. Pre- and postoperative 3-dimensional photogrammetry (Canfield) were analyzed. Anthropometric landmarks were placed and measured by 2 independent observers. Statistics involved both paired and unpaired t tests (significance = P < 0.05).Results:One hundred eight photogrammetric data sets were analyzed, including 46 single-piece, 26 SAME, and 36 segmental. Significant postoperative nasal changes were observed within each intragroup analysis. The most dramatic changes were seen after segmental Le Fort I with advancement and widening, which included alar base width, alar width, nostril width, and soft triangle angle, all P < 0.05.Conclusions:Le Fort I osteotomy results in significant alteration of the nasolabial morphology. This is the first study to 3-dimensionally analyze nasal changes that occur comparing maxillary advancement alone versus widening alone (SAME) versus advancement with widening. These objective data permit improved patient counseling and surgical planning.

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“…Validity and reliability of the 3D photogrammetric tool for anthropometric measurements were confirmed in previous studies. 23,24,26,27 …”

Section: Methodsmentioning

confidence: 99%

Three-dimensional Nasolabial Morphologic Alterations Following Le Fort I

DeSesa

Metzler²,

Sawh-Martinez

et al. 2016

Plastic and Reconstructive Surgery - Global Open

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“…The multiple‐camera tripod camera system has the advantage of capturing the image within 0.4 of a second, minimizing the effects of subject movement. Previous studies compared digital 3D photogrammetry with direct anthropometry methods and assessed its accuracy and reliability . They have consistently demonstrated favourable accuracy and reproducibility, making them feasible in both clinical practice and research environments.…”

Section: Introductionmentioning

confidence: 99%

Accuracy and reliability of digital craniofacial measurements using a small‐format, handheld 3D camera

Kim

Chandiramani

et al. 2018

Orthod Craniofacial Res

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“…Fairfield, NJ, USA), and the Facial Insight 3D (Motion View Software, LLC, Chattanooga TN, USA)[57,[65][66][67][68] Aldridge et al (2005). evaluated the precision and reproducibility of coordinate data and 190 distances on two sets of measurements made on 30 3dMDface images taken from 15 human subjects and found this system to be highly precise and reliable with a submillimeter average error in landmark placement.…”

mentioning

confidence: 99%