Three-dimensional morphometric analysis of facial units in virtual smiling facial images with different smile expressions

Hang-Nga Mai; Thaw Thaw Win; Minh Son Tong; Cheong-Hee Lee; Kyu-Bok Lee; So-Yeun Kim; Hyun-Woo Lee; Du-Hyeong Lee

doi:10.4047/jap.2023.15.1.1

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Three-dimensional morphometric analysis of facial units in virtual smiling facial images with different smile expressions

Journal article

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Three-dimensional morphometric analysis of facial units in virtual smiling facial images with different smile expressions

Hang-Nga Mai, Thaw Thaw Win, Minh Son Tong, Cheong-Hee Lee, Kyu-Bok Lee, So-Yeun Kim, Hyun-Woo Lee and Du-Hyeong Lee

The journal of advanced prosthodontics, Vol.15(1), pp.1-10

02/01/2023

DOI: 10.4047/jap.2023.15.1.1

PMCID: PMC9992697

PMID: 36908751

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Abstract

PURPOSE. Accuracy of image matching between resting and smiling facial mod-els is affected by the stability of the reference surfaces. This study aimed to in-vestigate the morphometric variations in subdivided facial units during resting, posed and spontaneous smiling. MATERIALS AND METHODS. The posed and spontaneous smiling faces of 33 adults were digitized and registered to the rest-ing faces. The morphological changes of subdivided facial units at the forehead (upper and lower central, upper and lower lateral, and temple), nasal (dorsum, tip, lateral wall, and alar lobules), and chin (central and lateral) regions were as-sessed by measuring the 3D mesh deviations between the smiling and resting facial models. The one-way analysis of variance, Duncan post hoc tests, and Stu-dent's t-test were used to determine the differences among the groups (alpha = .05). RESULTS. The smallest morphometric changes were observed at the upper and central forehead and nasal dorsum; meanwhile, the largest deviation was found at the nasal alar lobules in both the posed and spontaneous smiles (P < .001). The spontaneous smile generally resulted in larger facial unit changes than the posed smile, and significant difference was observed at the alar lobules, central chin, and lateral chin units (P < .001). CONCLUSION. The upper and central forehead and nasal dorsum are reliable areas for image matching between resting and smiling 3D facial images. The central chin area can be considered an additional reference area for posed smiles; however, special cautions should be taken when selecting this area as references for spontaneous smiles. [J Adv Prosthodont 2023;15:1-10]

Dentistry, Oral Surgery & Medicine

Life Sciences & Biomedicine

Science & Technology

Details

Title: Subtitle: Three-dimensional morphometric analysis of facial units in virtual smiling facial images with different smile expressions
Creators: Hang-Nga Mai - Kyungpook Natl Univ, Inst Translat Res Dent, Sch Dent, 2175 Dalgubeol Daero, Daegu 41940, South Korea
Thaw Thaw Win - Kyungpook National University
Minh Son Tong - Hanoi Medical University
Cheong-Hee Lee - Kyungpook National University
Kyu-Bok Lee - Kyungpook Natl Univ, Sch Dent, Dept Prosthodont, 2175 Dalgubeol Daero, Daegu 41940, South Korea
So-Yeun Kim - Kyungpook National University
Hyun-Woo Lee - Eulji University
Du-Hyeong Lee - Kyungpook Natl Univ, Inst Translat Res Dent, Sch Dent, 2175 Dalgubeol Daero, Daegu 41940, South Korea
Resource Type: Journal article
Publication Details: The journal of advanced prosthodontics, Vol.15(1), pp.1-10
DOI: 10.4047/jap.2023.15.1.1
PMID: 36908751
PMCID: PMC9992697
NLM abbreviation: J Adv Prosthodont
ISSN: 2005-7806
eISSN: 2005-7814
Publisher: Korean Acad Prosthodontics
Number of pages: 10
Language: English
Date published: 02/01/2023
Academic Unit: Prosthodontics
Record Identifier: 9984914149802771

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