Developmental shape changes in facial morphology: Geometric morphometric analyses based on a prospective, population-based, Chinese cohort in Hong Kong

Wen, Yi Feng; Wong, Hai Ming; McGrath, Colman

doi:10.1371/journal.pone.0218542

Cited by 8 publications

(7 citation statements)

References 42 publications

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“…Few studies have investigated variance of facial shape. Among Hong Kong adolescents, variance of frontal facial shape decreased signi cantly among females but not among males from 12 to 18 years (15). For lateral facial images, signi cant reduction in variance of facial shape was observed among both genders.…”

Section: Discussionmentioning

confidence: 88%

Soft tissue facial changes among adult females during the first six months of orthodontic treatment: a spatially dense 3D geometric morphometric study

Hou

Zhou

Dai

et al. 2020

Preprint

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Background: To investigate changes in facial morphology during the first six months of orthodontic treatment among adult females receiving orthodontic treatment.Methods: 18 adult females receiving orthodontic treatment were randomly recruited. 3D facial images were taken at baseline (T0), three months (T1), and six months (T2) after treatment initiation. Spatially dense facial landmarks were digitized to allow for sufficient details in characterization of facial features. 3D geometric morphometrics and multivariate statistics were used to investigate changes in mean and variance of facial shape and facial form associated with treatment.Results: We observed statistically significant changes in facial shape across the three treatment stages (p = 0.003). Pairwise comparisons suggested significant changes from T0 to T1 (p = 0.0059) and from T0 to T2 (p = 0.0098). Heatmap visualization indicated that the buccal and temporal region were invaginated while the labial region became protruded with treatment. The magnitude of shape change was 0.009, 0.004, and 0.010 from T0 to T1, T1 to T2, and T0 to T2, respectively, in unit of Procrustes distance. The average magnitude of change per-landmark was 1.31 mm, 0.22 mm, and 1.33 mm, respectively. Changes in mean facial form were not statistically significant (p = 0.103). No changes in variance of facial shape were observed across treatment stages (p > 0.05).Conclusion: Rate of facial changes was twice as fast during the first three months as that during fourth to sixth month. Buccal and temporal region became invaginated while labial region became protruded with treatment.

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Section: Discussionmentioning

confidence: 88%

Soft tissue facial changes among adult females during the first six months of orthodontic treatment: a spatially dense 3D geometric morphometric study

Hou

Zhou

Dai

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Few studies have investigated variance of facial shape. Among Hong Kong adolescents, variance of frontal facial shape decreased significantly among females but not among males from 12 to 18 years [ 16 ]. For lateral facial images, significant reduction in variance of facial shape was observed among both genders.…”

Section: Discussionmentioning

confidence: 99%

“…The use of GM in soft tissue facial analysis is emerging in recent years. Wen et al [ 16 ] investigated facial shape development among Hong Kong adolescents aged 12 to 18 years based on frontal and lateral facial photographs. In the field of orthodontics, Kouli et al [ 7 ] applied GM to investigate changes in facial profile before and after orthodontic treatment.…”

Section: Introductionmentioning

confidence: 99%

Soft tissue facial changes among adult females during alignment stage of orthodontic treatment: a 3D geometric morphometric study

et al. 2021

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Background To investigate changes in facial morphology during the first six months of orthodontic treatment among adult females receiving orthodontic treatment. Methods 43 adult females receiving orthodontic treatment were randomly recruited. 3D facial images were taken at baseline (T0), three months (T1), and six months (T2) after treatment initiation. Spatially dense facial landmarks were digitized to allow for sufficient details in characterization of facial features. 3D geometric morphometrics and multivariate statistics were used to investigate changes in mean and variance of facial shape and facial form associated with treatment. Results We observed statistically significant changes in facial shape across the three treatment stages (p = 0.0022). Pairwise comparisons suggested significant changes from T0 to T1 (p = 0.0045) and from T0 to T2 (p = 0.0072). Heatmap visualization indicated that the buccal and temporal region were invaginated while the labial region became protruded with treatment. The magnitude of shape change was 0.009, 0.004, and 0.010 from T0 to T1, T1 to T2, and T0 to T2, respectively, in unit of Procrustes distance. The average magnitude of change per-landmark was 1.32 mm, 0.21 mm, and 1.34 mm, respectively. Changes in mean facial form were not statistically significant (p = 0.1143). No changes in variance of facial shape were observed across treatment stages (p > 0.05). Conclusion Rate of facial changes was twice as fast during the first three months as that during fourth to sixth month. Buccal and temporal region became invaginated while labial region became protruded with treatment.

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“…The use of GM in soft tissue facial analysis is emerging in recent years. Wen et al (15) investigated facial shape development among Hong Kong adolescents aged 12 to 18 years based on frontal and lateral facial photographs. In the eld of orthodontics, Kouli et al (6) applied GM to investigate changes in facial pro le before and after orthodontic treatment.…”

Section: Introductionmentioning

confidence: 99%

Soft Tissue Facial Changes Among Adult Females Receiving Orthodontic Treatment: A Spatially Dense 3D Geometric Morphometric Study

Hou

Zhou

Dai

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract Background: To investigate changes in facial morphology during the first six months of orthodontic treatment among adult females receiving orthodontic treatment.Methods: 18 adult females receiving orthodontic treatment were randomly recruited. 3D facial images were taken at baseline (T0), three months (T1), and six months (T2) after treatment initiation. Spatially dense facial landmarks were digitized to allow for sufficient details in characterization of facial features. 3D geometric morphometrics and multivariate statistics were used to investigate changes in mean and variance of facial shape and facial form associated with treatment.Results: We observed statistically significant changes in facial shape across the three treatment stages (p = 0.003). Pairwise comparisons suggested significant changes from T0 to T1 (p = 0.0059) and from T0 to T2 (p = 0.0098). Heatmap visualization indicated that the buccal and temporal region were invaginated while the labial region became protruded with treatment. The magnitude of shape change was 0.009, 0.004, and 0.010 from T0 to T1, T1 to T2, and T0 to T2, respectively, in unit of Procrustes distance. The average magnitude of change per-landmark was 1.31 mm, 0.22 mm, and 1.33 mm, respectively. Changes in mean facial shape were not statistically significant (p = 0.103). No changes in variance of facial shape were observed across treatment stages (p > 0.05).Conclusion: Rate of facial changes was twice as fast during the first three months as that during fourth to sixth month. Buccal and temporal region became invaginated while labial region became protruded with treatment.

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Developmental shape changes in facial morphology: Geometric morphometric analyses based on a prospective, population-based, Chinese cohort in Hong Kong

Cited by 8 publications

References 42 publications

Soft tissue facial changes among adult females during the first six months of orthodontic treatment: a spatially dense 3D geometric morphometric study

Soft tissue facial changes among adult females during the first six months of orthodontic treatment: a spatially dense 3D geometric morphometric study

Soft tissue facial changes among adult females during alignment stage of orthodontic treatment: a 3D geometric morphometric study

Soft Tissue Facial Changes Among Adult Females Receiving Orthodontic Treatment: A Spatially Dense 3D Geometric Morphometric Study

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