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Franke A, Hofmann EC, Steinberg A, Lauer G, Kitzler H, Leonhardt H. Probing real-world Central European population midfacial skeleton symmetry for maxillofacial surgery. Clin Oral Investig 2023; 27:5637-5647. [PMID: 37535197 PMCID: PMC10492674 DOI: 10.1007/s00784-023-05185-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Accepted: 07/28/2023] [Indexed: 08/04/2023]
Abstract
OBJECTIVES Symmetry is essential for computer-aided surgical (CAS) procedures in oral and maxillofacial surgery (OMFS). A critical step for successful CAS is mirroring the unaffected side to create a template for the virtual reconstruction of the injured anatomical structure. The aim was to identify specific anatomical landmarks of the midfacial skeleton, to evaluate the symmetry in a group of the real-world Central European population, and to use these landmarks to assess midfacial symmetry in CT scans. MATERIAL AND METHODS The retrospective cross-sectional study defined landmarks of the midface's bony contour using viscerocranial CT data. The distances of the skeletal landmarks (e.g., the frontozygomatic suture and temporozygomatic suture) of the left and right sides from the midline were measured and statistically compared. Midfacial symmetry for reference points was defined as a difference within 0 mm and their mean difference plus one standard deviation. RESULTS We examined a total of 101 CT scans. 75% of our population shows symmetrical proportions of the midface. The means of the differences for the left and right sides ranged from 0.8 to 1.3 mm, averaging 1.1 ± 0.2 mm for all skeletal landmarks. The standard deviations ranged from 0.6 to 1.4 mm, with a computed mean of 0.9 ± 0.3 mm. CONCLUSION We established a methodology to assess the symmetry of the bony midface. If the determined differences were equal to or lower than 2.5 mm in the mentioned midfacial skeletal landmarks, then the symmetry of the bony midface was considered present, and symmetry-based methods for CAS procedures are applicable. CLINICAL RELEVANCE Many CAS procedures require facial symmetry. We provide an easy-to-apply method to probe for symmetry of the midface. The method may be used for population-based research, to check for proper reduction of fractures after reposition or to screen for symmetry prior to CAS planning.
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Affiliation(s)
- Adrian Franke
- Department of Oral and Maxillofacial Surgery, University Hospital Carl Gustav Carus, 01304, Dresden, Germany.
| | - Elisabeth Claudia Hofmann
- Department of Oral and Maxillofacial Surgery, University Hospital Carl Gustav Carus, 01304, Dresden, Germany
| | - Anna Steinberg
- Department of Oral and Maxillofacial Surgery, University Hospital Carl Gustav Carus, 01304, Dresden, Germany
| | - Günter Lauer
- Department of Oral and Maxillofacial Surgery, University Hospital Carl Gustav Carus, 01304, Dresden, Germany
| | - Hagen Kitzler
- Department of Diagnostic and Interventional Neuroradiology, University Hospital Carl Gustav Carus, Dresden, Germany
| | - Henry Leonhardt
- Department of Oral and Maxillofacial Surgery, University Hospital Carl Gustav Carus, 01304, Dresden, Germany
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Monteiro LCP, Ripardo RC, Torro-Alves N, Souza GS. Facial morphometric differences across face databases: influence of ethnicities and sex. Front Neurosci 2023; 17:1130867. [PMID: 37404467 PMCID: PMC10315459 DOI: 10.3389/fnins.2023.1130867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 06/05/2023] [Indexed: 07/06/2023] Open
Abstract
The scientific need for standardized, high-quality facial stimuli has driven the creation of several face image databases in recent years. These stimuli are particularly important in facial asymmetry research. However, previous studies have reported facial anthropometric differences across a variety of ethnicities. This highlights the need to investigate whether these differences can also impact the use of face image databases, particularly in facial asymmetry research. In this study, we investigated facial asymmetry-based morphometric differences between the multi-ethnic Chicago Face Database (CFD) and the LACOP Face Database, which is composed of Brazilian subjects. We found reliable differences in facial asymmetry between the two databases, which were related to ethnic groups. Specifically, differences in eye and mouth asymmetry seem to drive these differences. The asymmetry-based morphometric differences among databases and ethnicities found in this study reinforce the necessity of creating multi-ethnic face databases.
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Affiliation(s)
- Luis Carlos Pereira Monteiro
- Neuroscience and Cell Biology Graduate Program, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
- Center for Tropical Medicine, Federal University of Pará, Belém, Brazil
| | - Rachel Coelho Ripardo
- Neuroscience and Behavior Graduate Program, Center for Behavioral Theory and Research, Federal University of Pará, Belém, Brazil
| | - Nelson Torro-Alves
- Department of Psychology, Federal University of Paraíba, João Pessoa, Brazil
| | - Givago Silva Souza
- Neuroscience and Cell Biology Graduate Program, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
- Center for Tropical Medicine, Federal University of Pará, Belém, Brazil
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Abstract
Symmetry of the face is one of the most important features for the perception of attractiveness. Asymmetry of the face means that the right and left sides of the face are not identical. Subclinical facial asymmetry is very common in the general population. Most people have some slight facial asymmetry, and this is the normal biological situation in humans. Abnormalities from soft tissue, dental, and skeletal elements lead to facial asymmetry. Asymmetry has many causal factors, and its aetiology includes both congenital and acquired conditions. Neurological facial asymmetry is scarcely addressed in the dental literature. In this narrative review, we focus on the most common neurological causes of facial asymmetry. From a neurological point of view, facial asymmetry can result from disturbances of the cranial nerves, developmental disorders, or myopathies. In the broad range of differential diagnostics of facial asymmetry, neurological abnormalities should be taken into consideration. The treatment must be related to the underlying cause. Complete knowledge of the aetiological factors and the character of the asymmetry plays a crucial role in formulating a treatment plan.
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Tran C, Choi D, Wang K, Carter KD, Ko AC, Shriver EM. Trends in horizontal periocular asymmetry. CANADIAN JOURNAL OF OPHTHALMOLOGY 2021; 58:229-234. [PMID: 34921767 DOI: 10.1016/j.jcjo.2021.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/30/2021] [Accepted: 11/10/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To determine whether there is laterality predominance in the horizontal dimensions of the periocular region. DESIGN Retrospective study. PARTICIPANTS Patients >18 years of age who presented to a single academic ophthalmology department. Exclusion criteria included history of facial trauma or surgery, aesthetic injections, or other periocular-altering processes. METHODS Standardized digital photographs were obtained, and periocular structures were measured with Image J software. The midline was defined as the midpoint between the medial canthi, and the distances measured include midline to medial canthus, pupil centre, lateral canthus, and lateral zygoma. The palpebral fissure width was calculated as the distance between the lateral canthus and medial canthus. Data analysis was done for the full cohort and subsequently according to patient-identified gender. RESULTS Periocular structures were measured in 83 patients (50 female and 33 male) with a mean age of 57.0 ± 16.2 years (range, 22-84 years). Right-sided predominance was found to be increasingly significant for the following variables: midline to pupil centre (31.34 mm vs 31.08 mm, p < 0.01), midline to lateral canthus (42.57 mm vs 42.23 mm, p < 0.005), and midline to lateral zygoma (65.70 mm vs 64.01 mm, p < 0.001). CONCLUSIONS Photographic analysis of adults with no periocular-altering history demonstrates that there is a right-sided predominance in the horizontal dimension of the midline to the pupil, lateral canthus, and zygoma with increasing significance. Asymmetry of horizontal periocular measurements was more prevalent in males.
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Affiliation(s)
| | - Dabin Choi
- Carver College of Medicine, Iowa City, Iowa
| | - Kai Wang
- Department of Biostatistics, College of Public Health, Iowa City, Iowa
| | - Keith D Carter
- Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa
| | - Audrey C Ko
- Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa; Wolfe Eye Clinic, West Des Moines, Iowa
| | - Erin M Shriver
- Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa.
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Evaluation of facial asymmetry by stereophotogrammetry in individuals with unilateral maxillary impacted canine. J Orofac Orthop 2021; 82:226-235. [PMID: 33725142 DOI: 10.1007/s00056-021-00285-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 01/29/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE The aim of this study is to compare the symmetry of the facial and dentoalveolar structures of patients with unilateral impacted maxillary canine teeth with a control group of individuals without impacted teeth using three-dimensional face scans. METHODS The study included 28 patients (10 females, 18 males) with unilateral impacted maxillary canine teeth and 28 patients (15 females, 13 males) without any impacted maxillary canine between 12 and 25 years of age. The 3dMDface™ (3dMD Inc., Atlanta, GA, USA) imaging system was used to obtain 3D face images. 3dMD Vultus® (3dMD Inc., Atlanta, GA, USA) software was used for the measurements. RESULTS According to the study findings, there were differences in linear measurements and volume measurements between the right and left sides of the face in patients with an impacted canine. However, these differences were not statistically significant. In patients with an impacted canine, surface differences between the right and left halves of the face were not found to be statistically different from the control group. CONCLUSION There was no difference in the amount of facial asymmetry between patients with unilateral maxillary impacted canine and patients with normal tooth alignment in the control group.
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Laterality and Left-sidedness in the Nose, Face, and Body: A New Finding. PLASTIC AND RECONSTRUCTIVE SURGERY-GLOBAL OPEN 2017; 5:e1590. [PMID: 29632770 PMCID: PMC5889430 DOI: 10.1097/gox.0000000000001590] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 10/17/2017] [Indexed: 12/11/2022]
Abstract
Background: Asymmetry is a common occurrence in bilaterian animals, particularly human beings. Through examination of patients and their photographs during rhinoplasty, we noted wider left-sided nasal and facial features in most patients. This observation led us to hypothesize that this might be consistent to the whole body. Methods: We conducted a study in 3 parts to test the question above. First, we analyzed operating notes of 50 rhinoplasty patients to determine the wider side of the upper, middle, and lower thirds of the nose. Second, we analyzed the width of the face and chest wall in 31 patients to discern any correlation between facial and bodily asymmetry. Third, computerized tomographic scans of the thorax and body of 48 patients were studied to measure the width of the hemithorax and hemipelvic bone. Results: (1) Upper vault width was wider on left side (78%). Left middle vault width was wider (88%). The lower lateral cartilage, lateral crura convexity was more prominent on left side (48%), and a wider scroll area was found and trimmed in 21 (left) and 0 (right) cases. The alar base was wider on left side (56%). (2) In the body and face analysis, 64.5% had a wider left-sided face and body. (3) In the computed tomographic scan analysis, same-sided thorax and pelvis asymmetry was seen (85.35%), 33 and 7 of which were left- and right-sided, respectively. Conclusion: We observed generalized asymmetry of the face and body with left-sided predominance.
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Johnson EK, Fields HW, Beck FM, Firestone AR, Rosenstiel SF. Role of facial attractiveness in patients with slight-to-borderline treatment need according to the Aesthetic Component of the Index of Orthodontic Treatment Need as judged by eye tracking. Am J Orthod Dentofacial Orthop 2017; 151:297-310. [PMID: 28153159 DOI: 10.1016/j.ajodo.2016.06.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 06/01/2016] [Accepted: 06/01/2016] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Previous eye-tracking research has demonstrated that laypersons view the range of dental attractiveness levels differently depending on facial attractiveness levels. How the borderline levels of dental attractiveness are viewed has not been evaluated in the context of facial attractiveness and compared with those with near-ideal esthetics or those in definite need of orthodontic treatment according to the Aesthetic Component of the Index of Orthodontic Treatment Need scale. Our objective was to determine the level of viewers' visual attention in its treatment need categories levels 3 to 7 for persons considered "attractive," "average," or "unattractive." METHODS Facial images of persons at 3 facial attractiveness levels were combined with 5 levels of dental attractiveness (dentitions representing Aesthetic Component of the Index of Orthodontic Treatment Need levels 3-7) using imaging software to form 15 composite images. Each image was viewed twice by 66 lay participants using eye tracking. Both the fixation density (number of fixations per facial area) and the fixation duration (length of time for each facial area) were quantified for each image viewed. Repeated-measures analysis of variance was used to determine how fixation density and duration varied among the 6 facial interest areas (chin, ear, eye, mouth, nose, and other). RESULTS Viewers demonstrated excellent to good reliability among the 6 interest areas (intraviewer reliability, 0.70-0.96; interviewer reliability, 0.56-0.93). Between Aesthetic Component of the Index of Orthodontic Treatment Need levels 3 and 7, viewers of all facial attractiveness levels showed an increase in attention to the mouth. However, only with the attractive models were significant differences in fixation density and duration found between borderline levels with female viewers. Female viewers paid attention to different areas of the face than did male viewers. CONCLUSIONS The importance of dental attractiveness is amplified in facially attractive female models compared with average and unattractive female models between near-ideal and borderline-severe dentally unattractive levels.
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Affiliation(s)
| | - Henry W Fields
- Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio.
| | - F Michael Beck
- Division of Oral Biology, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Allen R Firestone
- Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Stephen F Rosenstiel
- Division of Restorative and Prosthetic Dentistry, College of Dentistry, Ohio State University, Columbus, Ohio
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Quinto-Sánchez M, Cintas C, Silva de Cerqueira CC, Ramallo V, Acuña-Alonzo V, Adhikari K, Castillo L, Gomez-Valdés J, Everardo P, De Avila F, Hünemeier T, Jaramillo C, Arias W, Fuentes M, Gallo C, Poletti G, Schuler-Faccini L, Bortolini MC, Canizales-Quinteros S, Rothhammer F, Bedoya G, Rosique J, Ruiz-Linares A, González-José R. Socioeconomic Status Is Not Related with Facial Fluctuating Asymmetry: Evidence from Latin-American Populations. PLoS One 2017; 12:e0169287. [PMID: 28060876 PMCID: PMC5218465 DOI: 10.1371/journal.pone.0169287] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 12/14/2016] [Indexed: 11/18/2022] Open
Abstract
The expression of facial asymmetries has been recurrently related with poverty and/or disadvantaged socioeconomic status. Departing from the developmental instability theory, previous approaches attempted to test the statistical relationship between the stress experienced by individuals grown in poor conditions and an increase in facial and corporal asymmetry. Here we aim to further evaluate such hypothesis on a large sample of admixed Latin Americans individuals by exploring if low socioeconomic status individuals tend to exhibit greater facial fluctuating asymmetry values. To do so, we implement Procrustes analysis of variance and Hierarchical Linear Modelling (HLM) to estimate potential associations between facial fluctuating asymmetry values and socioeconomic status. We report significant relationships between facial fluctuating asymmetry values and age, sex, and genetic ancestry, while socioeconomic status failed to exhibit any strong statistical relationship with facial asymmetry. These results are persistent after the effect of heterozygosity (a proxy for genetic ancestry) is controlled in the model. Our results indicate that, at least on the studied sample, there is no relationship between socioeconomic stress (as intended as low socioeconomic status) and facial asymmetries.
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Affiliation(s)
- Mirsha Quinto-Sánchez
- Grupo de Investigación en Biología Evolutiva Humana, Instituto Patagónico de Ciencias Sociales y Humanas, Centro Nacional Patagónico, CONICET. Puerto Madryn, Chubut, Argentina
- Ciencia Forense, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, México
| | - Celia Cintas
- Grupo de Investigación en Biología Evolutiva Humana, Instituto Patagónico de Ciencias Sociales y Humanas, Centro Nacional Patagónico, CONICET. Puerto Madryn, Chubut, Argentina
| | - Caio Cesar Silva de Cerqueira
- Grupo de Investigación en Biología Evolutiva Humana, Instituto Patagónico de Ciencias Sociales y Humanas, Centro Nacional Patagónico, CONICET. Puerto Madryn, Chubut, Argentina
- Ciencia Forense, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, México
- Superintendência da Polícia Técnico-Científica do Estado de São Paulo. Equipe de Perícias Criminalísticas de Ourinhos, São Paulo, Brazil
| | - Virginia Ramallo
- Grupo de Investigación en Biología Evolutiva Humana, Instituto Patagónico de Ciencias Sociales y Humanas, Centro Nacional Patagónico, CONICET. Puerto Madryn, Chubut, Argentina
| | - Victor Acuña-Alonzo
- Department of Genetics, Evolution and Environment, and UCL Genetics Institute, University College London, London, United Kingdom
- Escuela Nacional de Antropología e Historia. Instituto Nacional de Antropología e Historia, Ciudad de México, México
| | - Kaustubh Adhikari
- Department of Genetics, Evolution and Environment, and UCL Genetics Institute, University College London, London, United Kingdom
| | - Lucía Castillo
- Grupo de Investigación en Biología Evolutiva Humana, Instituto Patagónico de Ciencias Sociales y Humanas, Centro Nacional Patagónico, CONICET. Puerto Madryn, Chubut, Argentina
| | - Jorge Gomez-Valdés
- Posgrado en Antropología Física, Escuela Nacional de Antropología e Historia, Ciudad de México, México
| | - Paola Everardo
- Escuela Nacional de Antropología e Historia. Instituto Nacional de Antropología e Historia, Ciudad de México, México
| | - Francisco De Avila
- Escuela Nacional de Antropología e Historia. Instituto Nacional de Antropología e Historia, Ciudad de México, México
| | - Tábita Hünemeier
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo
| | | | | | - Macarena Fuentes
- Department of Genetics, Evolution and Environment, and UCL Genetics Institute, University College London, London, United Kingdom
- Departamento de Técnología Médica, Facultad de Ciencias de la Salud, Universidad de Tarapacá, Arica, Chile
| | - Carla Gallo
- Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Giovani Poletti
- Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Lavinia Schuler-Faccini
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil
| | - Maria Cátira Bortolini
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil
| | - Samuel Canizales-Quinteros
- Unidad de Genómica de Poblaciones Aplicada a la Salud, Facultad de Química, UNAM-Instituto Nacional de Medicina Genómica, Ciudad de México, México
| | | | | | - Javier Rosique
- Departamento de Antropología. Facultad de Ciencias Sociales y Humanas. Universidad de Antioquia, Medellín, Colombia
| | - Andrés Ruiz-Linares
- Department of Genetics, Evolution and Environment, and UCL Genetics Institute, University College London, London, United Kingdom
- MOE Key Laboratory of Contemporary Anthropology, Fudan University, Shanghai, China
- Aix Marseille Univ, CNRS, EFS, ADES, Marseille, France
| | - Rolando González-José
- Grupo de Investigación en Biología Evolutiva Humana, Instituto Patagónico de Ciencias Sociales y Humanas, Centro Nacional Patagónico, CONICET. Puerto Madryn, Chubut, Argentina
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Reddy MR, Bogavilli SR, Raghavendra V, Polina VS, Basha SZ, Preetham R. Prevalence of facial asymmetry in Tirupati population: A posteroanterior cephalometric and photographic study. J Int Soc Prev Community Dent 2016; 6:S205-S212. [PMID: 28217538 PMCID: PMC5285596 DOI: 10.4103/2231-0762.197194] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 12/01/2016] [Accepted: 12/30/2016] [Indexed: 11/17/2022] Open
Abstract
AIMS AND OBJECTIVE The human face is the most prominent aspect in human social interactions, and therefore, it seems reasonable opting for orthodontic treatment is to overcome psychosocial difficulties relating to facial and dental appearance and enhance the quality of life in doing so. MATERIALS AND METHODS Posteroanterior cephalograms and frontal photographs of 100 participants (50 males and 50 females) were analyzed to evaluate skeletal asymmetry by the analysis suggested by Grummons. Soft tissue facial asymmetry was analyzed by composite photographic analysis. The data were statistically analyzed using the Statistical Package for the Social Sciences version 16.0 software. Independent t-test was used to find the differences between different measurements. RESULTS All participants showed mild asymmetry and right-sided laterality. The difference between the right and left sides were statistically insignificant (P > 0.01). The test revealed that only Co distance was statistically significant (P < 0.01), and all the other values are not statistically significant. CONCLUSION Composite photographs of hundred participants revealed that facedness is towards the right, however, this laterality was not statistically significant. Both posteroanterior cephalograms and composite photographs showed right-sided laterality. Gender difference in both skeletal and soft tissue asymmetry is not statistically significant.
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Affiliation(s)
- M. Radhika Reddy
- Department of Orthodontics, Meghana Institute of Dental Sciences, Nizamabad, India
| | | | | | - Venkata S. Polina
- Department of Orthodontics, Mallareddy Institute of Dental Sciences, Hyderabad, India
| | | | - R. Preetham
- Department of Orthodontics, Gitam Dental College, Vishakhapatnam, Andhra Pradesh, India
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Wang J, Yang N, Liao W, Zhang H, Yan CG, Zang YF, Zuo XN. Dorsal anterior cingulate cortex in typically developing children: Laterality analysis. Dev Cogn Neurosci 2016; 15:117-29. [PMID: 26602957 PMCID: PMC6989820 DOI: 10.1016/j.dcn.2015.10.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 10/03/2015] [Accepted: 10/05/2015] [Indexed: 12/13/2022] Open
Abstract
Gray matter density asymmetry in the dACC is region-specific in children. Superior dACC has greater connectivity with right control/left default network. Inferior dACC has greater connectivity with right visual and default network. Boys are more lateralized in ipsilateral connectivity with visual cortex than girls. Boys and girls differ in age-related laterality changes of dACC connectivity.
We aimed to elucidate the dACC laterality in typically developing children and their sex/age-related differences with a sample of 84 right-handed children (6–16 years, 42 boys). We first replicated the previous finding observed in adults that gray matter density asymmetry in the dACC was region-specific: leftward (left > right) in its superior part, rightward (left < right) in its inferior part. Intrinsic connectivity analysis of these regions further revealed region-specific asymmetric connectivity profiles in dACC as well as their sex and age differences. Specifically, the superior dACC connectivity with frontoparietal network and the inferior dACC connectivity with visual network are rightward. The superior dACC connectivity with the default network (lateral temporal cortex) was more involved in the left hemisphere. In contrast, the inferior dACC connectivity with the default network (anterior medial prefrontal cortex) was more lateralized towards the right hemisphere. The superior dACC connectivity with lateral visual cortex was more distinct across two hemispheres in girls than that in boys. This connection in boys changed with age from right-prominent to left-prominent asymmetry whereas girls developed the connection from left-prominent to no asymmetry. These findings not only highlight the complexity and laterality of the dACC but also provided insights into dynamical structure–function relationships during the development.
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Affiliation(s)
- Jue Wang
- Key Laboratory of Behavioral Science and Magnetic Resonance Imaging Research Center, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ning Yang
- Key Laboratory of Behavioral Science and Magnetic Resonance Imaging Research Center, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Laboratory for Functional Connectome and Development, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
| | - Wei Liao
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China
| | - Han Zhang
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China
| | - Chao-Gan Yan
- Key Laboratory of Behavioral Science and Magnetic Resonance Imaging Research Center, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
| | - Yu-Feng Zang
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China
| | - Xi-Nian Zuo
- Key Laboratory of Behavioral Science and Magnetic Resonance Imaging Research Center, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
- Laboratory for Functional Connectome and Development, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
- Faculty of Psychology, Southwest University, Chongqing 400715, China
- Department of Psychology, School of Education Science, Guangxi Teachers Education University, Guangxi 530001, China
- Corresponding author at: Key Laboratory of Behavioral Science and Magnetic Resonance Imaging Research Center, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China. http://lfcd.psych.ac.cn
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Abstract
PURPOSE Facial asymmetry is not uncommon in normal individuals. Nasal septum is known to play a direct and indirect role in the premaxillary and maxillary growth. In this study, we aimed to evaluate the integrated relationship between nasal septal deviation and facial asymmetry by means of 3-dimensional analysis in a larger number of patients than those in previous studies. METHODS From April 2011 to March 2014, a total of 60 subjects were included. They had facial asymmetry confirmed by facial three-dimensional CT. Patients who had a history of facial bone fracture or congenital craniofacial deformities were excluded. Facial asymmetry was analyzed in 3 aspects: facial width, projection, and height. Nasal septal deviations included horizontal and vertical deviations. RESULTS The patients with right horizontal nasal septal deviation to the right had a wider right side of the face (P = 0.028). Facial asymmetry was observed more frequently in the right side of the face in the current study (P = 0.020). There were no other close relationships between nasal septal deviation and facial asymmetry. CONCLUSION We demonstrate that there is a strong relationship between nasal septal deviation to the right and a wider right hemiface in facial asymmetry patients. Also, facial asymmetry patients tend to have a wider right side of the face compared to the left side.
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Richards MR, Fields HW, Beck FM, Firestone AR, Walther DB, Rosenstiel S, Sacksteder JM. Contribution of malocclusion and female facial attractiveness to smile esthetics evaluated by eye tracking. Am J Orthod Dentofacial Orthop 2015; 147:472-82. [PMID: 25836007 DOI: 10.1016/j.ajodo.2014.12.016] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2014] [Revised: 12/01/2014] [Accepted: 12/01/2014] [Indexed: 11/28/2022]
Abstract
INTRODUCTION There is disagreement in the literature concerning the importance of the mouth in overall facial attractiveness. Eye tracking provides an objective method to evaluate what people see. The objective of this study was to determine whether dental and facial attractiveness alters viewers' visual attention in terms of which area of the face (eyes, nose, mouth, chin, ears, or other) is viewed first, viewed the greatest number of times, and viewed for the greatest total time (duration) using eye tracking. METHODS Seventy-six viewers underwent 1 eye tracking session. Of these, 53 were white (49% female, 51% male). Their ages ranged from 18 to 29 years, with a mean of 19.8 years, and none were dental professionals. After being positioned and calibrated, they were shown 24 unique female composite images, each image shown twice for reliability. These images reflected a repaired unilateral cleft lip or 3 grades of dental attractiveness similar to those of grades 1 (near ideal), 7 (borderline treatment need), and 10 (definite treatment need) as assessed in the aesthetic component of the Index of Orthodontic Treatment Need (AC-IOTN). The images were then embedded in faces of 3 levels of attractiveness: attractive, average, and unattractive. During viewing, data were collected for the first location, frequency, and duration of each viewer's gaze. RESULTS Observer reliability ranged from 0.58 to 0.92 (intraclass correlation coefficients) but was less than 0.07 (interrater) for the chin, which was eliminated from the study. Likewise, reliability for the area of first fixation was kappa less than 0.10 for both intrarater and interrater reliabilities; the area of first fixation was also removed from the data analysis. Repeated-measures analysis of variance showed a significant effect (P <0.001) for level of attractiveness by malocclusion by area of the face. For both number of fixations and duration of fixations, the eyes overwhelmingly were most salient, with the mouth receiving the second most visual attention. At times, the mouth and the eyes were statistically indistinguishable in viewers' gazes of fixation and duration. As the dental attractiveness decreased, the visual attention increased on the mouth, approaching that of the eyes. AC-IOTN grade 10 gained the most attention, followed by both AC-IOTN grade 7 and the cleft. AC-IOTN grade 1 received the least amount of visual attention. Also, lower dental attractiveness (AC-IOTN 7 and AC-IOTN 10) received more visual attention as facial attractiveness increased. CONCLUSIONS Eye tracking indicates that dental attractiveness can alter the level of visual attention depending on the female models' facial attractiveness when viewed by laypersons.
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Affiliation(s)
- Michael R Richards
- Resident, Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Henry W Fields
- Professor and chair, Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio.
| | - F Michael Beck
- Professor emeritus, Division of Oral Biology, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Allen R Firestone
- Associate professor, Division of Orthodontics, College of Dentistry, Ohio State University, Columbus, Ohio
| | - Dirk B Walther
- Assistant professor, Department of Psychology, Ohio State University, Columbus, Ohio
| | - Stephen Rosenstiel
- Professor emeritus, Division of Restorative and Dentistry and Primary Care, College of Dentistry, Ohio State University, Columbus, Ohio
| | - James M Sacksteder
- Postgraduate student, College of Dentistry, Ohio State University, Columbus, Ohio
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Rajpara Y, Shyagali TR. An assessment of sexual dimorphism in relation to facial asymmetry in esthetically pleasing faces. Acta Inform Med 2015; 23:44-8. [PMID: 25870491 PMCID: PMC4384877 DOI: 10.5455/aim.2015.23.44-48] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Accepted: 02/12/2015] [Indexed: 11/18/2022] Open
Abstract
Objective: The aim of the study is to detect gender-wise difference in the skeletal asymmetry in the esthetically pleasing faces. Materials and methods: a cross sectional study was conducted on 25 females and 25 males of age 18 -25 years using the posterior-anterior cephalograms. The selected part of grummon’s frontal analysis for analyzing the vertical skeletal asymmetries, mandibular morphology, transverse asymmetry and mandibular deviation was used. The obtained data was subjected to independent student’s‘t’ test for comparing the difference between males and females. Results: there was statistically significant difference between the males and females for the measurements like Gonion-Menton length for the mandibular morphology and for the transverse parameters like zygomatico frontal suture length, jular length and antegonial notch length. There was no significant difference for the sidedness of asymmetry for the males and females. Conclusion: frontal facial asymmetry showed sexual dimorphism with males showing greater asymmetric values than the females. The asymmetry showed right sided prominence for both the males and females. This knowledge can be utilized for planning facial reconstruction and remodeling surgeries.
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Affiliation(s)
- Yagnesh Rajpara
- Department of Orthodontics and Dentofacial Orthopedics, Goneka Research Institute of Dental Sciences, Gandhinagar, Gujarat, India
| | - Tarulatha R Shyagali
- Department of Orthodontics and Dentofacial Orthopedics, Darshan Dental College and Hospital, Udaipur, Rajasthan, India
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Quinto-Sánchez M, Adhikari K, Acuña-Alonzo V, Cintas C, Silva de Cerqueira CC, Ramallo V, Castillo L, Farrera A, Jaramillo C, Arias W, Fuentes M, Everardo P, de Avila F, Gomez-Valdés J, Hünemeier T, Gibbon S, Gallo C, Poletti G, Rosique J, Bortolini MC, Canizales-Quinteros S, Rothhammer F, Bedoya G, Ruiz-Linares A, González-José R. Facial asymmetry and genetic ancestry in Latin American admixed populations. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2015; 157:58-70. [DOI: 10.1002/ajpa.22688] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 12/03/2014] [Accepted: 12/11/2014] [Indexed: 11/08/2022]
Affiliation(s)
| | - Kaustubh Adhikari
- Department of Genetics; Evolution and Environment; and UCL Genetics Institute; University College London; London UK
| | - Victor Acuña-Alonzo
- Department of Genetics; Evolution and Environment; and UCL Genetics Institute; University College London; London UK
- Escuela Nacional de Antropología e Historia; Instituto Nacional de Antropología e Historia; Distrito Federal Mexico
| | - Celia Cintas
- Centro Nacional Patagónico, CONICET; Puerto Madryn Argentina
| | | | | | - Lucia Castillo
- Centro Nacional Patagónico, CONICET; Puerto Madryn Argentina
| | - Arodi Farrera
- Posgrado en Antropología; Facultad de Filosofía y Letras; UNAM; México City Mexico
| | - Claudia Jaramillo
- Departamento de Antropología; Facultad de Ciencias Humanas y Sociales; Universidad de Antioquia; Medellín Colombia
| | - Williams Arias
- Departamento de Antropología; Facultad de Ciencias Humanas y Sociales; Universidad de Antioquia; Medellín Colombia
| | - Macarena Fuentes
- Instituto de Alta Investigación Universidad de Tarapacá, Programa de Genética Humana ICBM Facultad de Medicina Universidad de Chile y Centro de Investigaciones del Hombre en el Desierto; Arica Chile
| | - Paola Everardo
- Escuela Nacional de Antropología e Historia; Instituto Nacional de Antropología e Historia; Distrito Federal Mexico
| | - Francisco de Avila
- Escuela Nacional de Antropología e Historia; Instituto Nacional de Antropología e Historia; Distrito Federal Mexico
| | | | - Tábita Hünemeier
- Departamento de Genética; Instituto de Biociências, Universidade Federal do Rio Grande do Sul; Porto Alegre Brasil
| | - Shara Gibbon
- Department of Anthropology; University College London; London UK
| | - Carla Gallo
- Laboratorios de Investigación y Desarrollo; Facultad de Ciencias y Filosofía; Universidad Peruana Cayetano Heredia; Lima Perú
| | - Giovanni Poletti
- Laboratorios de Investigación y Desarrollo; Facultad de Ciencias y Filosofía; Universidad Peruana Cayetano Heredia; Lima Perú
| | - Javier Rosique
- Departamento de Antropología; Facultad de Ciencias Humanas y Sociales; Universidad de Antioquia; Medellín Colombia
| | - Maria Cátira Bortolini
- Departamento de Genética; Instituto de Biociências, Universidade Federal do Rio Grande do Sul; Porto Alegre Brasil
| | - Samuel Canizales-Quinteros
- Unidad de Genómica de Poblaciones Aplicada a la Salud; Facultad de Química; UNAM-Instituto Nacional de Medicina Genómica
| | - Francisco Rothhammer
- Instituto de Alta Investigación Universidad de Tarapacá, Programa de Genética Humana ICBM Facultad de Medicina Universidad de Chile y Centro de Investigaciones del Hombre en el Desierto; Arica Chile
| | - Gabriel Bedoya
- Departamento de Antropología; Facultad de Ciencias Humanas y Sociales; Universidad de Antioquia; Medellín Colombia
| | - Andres Ruiz-Linares
- Department of Genetics; Evolution and Environment; and UCL Genetics Institute; University College London; London UK
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Bravo FG, Kufeke M, Pascual D. Incidence of lower eyelid asymmetry: an anthropometric analysis of 204 patients. Aesthet Surg J 2013; 33:783-8. [PMID: 23825308 DOI: 10.1177/1090820x13495406] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND To avoid complications and improve patient satisfaction with lower lid blepharoplasty, a precise assessment of any preoperative eyelid asymmetry is essential. OBJECTIVES The authors describe a method of assessing preoperative eyelid asymmetry through readily available software and classifying the resulting measurements. METHODS Digital images of 204 patients were analyzed using Photoshop CS3 Extended software (Adobe Systems, San Jose, California). The left eye was superimposed over the right eye using layers in the software program, and the lower eyelid margin and axis were outlined to obtain a diagram with the superimposed outlines of both eyes. Several measurements (ie, lateral canthal height, lower eyelid margin length and axis angle, and lower palpebral fissure surface area) were obtained for each patient. Differences between the right and left eyelids were recorded, and these data were compared between patients. RESULTS Of the 204 patients studied, 184 (90.2%) had some degree of asymmetry. Most (118; 64.13%) presented with the right lower eyelid at a more inferior position than the left (R-), while 66 (35.87%) presented with the right lower eyelid at a higher position than the left (R+), a difference that was highly significant (P < .001). CONCLUSIONS This software is a powerful and precise tool to evaluate and measure eyelid asymmetries. The use of this method showed a large degree of eyelid asymmetry preoperatively (more than 90%), which proves the importance of detecting and adequately analyzing this condition prior to surgery. The authors' simple method may be an important adjunct to obtaining optimal results in patients who seek eyelid surgery.
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Affiliation(s)
- Francisco G. Bravo
- Dr Bravo is Assistant Professor of Plastic Surgery at the Complutense University of Madrid and Program Director of the Plastic and Reconstructive Surgery Department of the Doce de Octubre University Hospital in Madrid, Spain
| | - Matias Kufeke
- Dr Kufeke is a plastic surgery resident at the Doce de Octubre University Hospital in Madrid
| | - David Pascual
- Dr David Pascual was a biostatistics and cardiology specialist and a faculty member of the Cardiology Department of the Gregorio Maranon University Hospital in Madrid. He passed away on May 9, 2011, during the study period
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Djordjevic J, Toma AM, Zhurov AI, Richmond S. Three-dimensional quantification of facial symmetry in adolescents using laser surface scanning. Eur J Orthod 2011; 36:125-32. [PMID: 21795753 DOI: 10.1093/ejo/cjr091] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Laser scanning is a non-invasive method for three-dimensional assessment of facial morphology and symmetry. The aim of this study was to quantify facial symmetry in healthy adolescents and explore if there is any gender difference. Facial scans of 270 subjects, 123 males and 147 females (aged 15.3 ± 0.1 years, range 14.6-15.6), were randomly selected from the Avon Longitudinal Study of Parents and Children. Facial scans were processed and analysed using in-house developed subroutines for commercial software. The surface matching between the original face and its mirror image was measured for the whole face, upper, middle, and lower facial thirds. In addition, 3 angular and 14 linear parameters were measured. The percentage of symmetry of the whole face was significantly lower in males (53.49 ± 10.73 per cent) than in females (58.50 ± 10.27 per cent; P < 0.01). There was no statistically significant difference in the amount of symmetry among facial thirds within each gender (P > 0.05). Average values of linear parameters were less than 1 mm and did not differ significantly between genders (P > 0.05). One angular parameter showed slight lip line asymmetry in both genders. Faces of male 15-year-old adolescents were less symmetric than those of females, but the difference in the amount of symmetry, albeit statistically significant, may not be clinically relevant. Upper, middle, and lower thirds of the face did not differ in the amount of three-dimensional symmetry. Angular and linear parameters of facial symmetry did not show any gender difference.
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Affiliation(s)
- Jelena Djordjevic
- Department of Orthodontics, School of Dentistry, University of Belgrade, Serbia
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Ercan I, Ozdemir ST, Etoz A, Sigirli D, Tubbs RS, Loukas M, Guney I. Facial asymmetry in young healthy subjects evaluated by statistical shape analysis. J Anat 2009; 213:663-9. [PMID: 19094182 DOI: 10.1111/j.1469-7580.2008.01002.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Statistical shape analysis, a relatively a new method for biological research, compares body forms by using specific landmarks determined by anatomical prominences. In this study, we aimed to identify normal facial asymmetry between the right and the left sides of the face. Facial landmark data were collected from two-dimensional digital images of 321 young healthy subjects (150 males and 171 females). These data were analysed using Euclidean distance matrix analysis. The number of significantly asymmetric linear distances between the two halves of the face was greater in females than in males. We found that the left side of the face was most commonly dominant in both males and females. Such data may be useful in establishing a database for future similar studies.
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Affiliation(s)
- Ilker Ercan
- Department of Biostatistics, Faculty of Medicine, Uludag University, Bursa, Turkey
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18
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Evidence of an eye movement-based memory effect in congenital prosopagnosia. Cortex 2008; 44:806-19. [DOI: 10.1016/j.cortex.2007.02.004] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2006] [Revised: 10/24/2006] [Accepted: 02/05/2007] [Indexed: 10/22/2022]
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19
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Haraguchi S, Iguchi Y, Takada K. Asymmetry of the Face in Orthodontic Patients. Angle Orthod 2008; 78:421-6. [PMID: 18416611 DOI: 10.2319/022107-85.1] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Accepted: 07/01/2007] [Indexed: 11/23/2022] Open
Abstract
Abstract
Objective: To investigate the laterality of the normal asymmetry of the human face, examining differences in laterality in relation to sex, growth stage, and skeletal classification.
Materials and Methods: A total of 1800 Japanese subjects (651 males and 1149 females; mean age, 15 years 3 months; range, 4 years 2 months to 59 years 11 months) were selected. Individuals in the sample were categorized according to sex, one of three growth stages, and one of three skeletal patterns. Differences in length between distances from the points at which ear rods were inserted to the facial midline and the perpendicular distance from the soft-tissue menton to the facial midline were measured on a frontal facial photograph. Subjects with a discrepancy of more than 3 standard deviations of the measurement error were categorized as having left- or right-sided laterality.
Results: Of subjects with facial asymmetry, 79.7% had a wider right hemiface, and 79.3% of those with chin deviation had left-sided laterality. These tendencies were independent of sex, age, or skeletal jaw relationships. In this regard, during pubertal growth, the proportion of subjects with wider right hemiface decreased (P < .0001), whereas the proportion of those with a wider left hemiface increased (P < .01), despite a consistent tendency for right-sided dominance.
Conclusion: These results suggest that laterality in the normal asymmetry of the face, which is consistently found in humans, is likely to be a hereditary rather than an acquired trait.
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Affiliation(s)
- Seiji Haraguchi
- a Assistant Professor, Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Osaka University, Osaka, Japan
| | - Yoshitaka Iguchi
- b Clinician, Department of Dentistry and Oral-Maxillofacial Surgery, NTT West Osaka Hospital, Osaka, Japan
| | - Kenji Takada
- c Professor and Chair, Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Osaka University, Osaka, Japan
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21
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Rogers GF, Greene AK, Oh AK, Robson C, Mulliken JB. Zygomaticotemporal synostosis: a rare cause of progressive facial asymmetry. Cleft Palate Craniofac J 2007; 44:106-11. [PMID: 17214532 DOI: 10.1597/05-148] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Cranial synostosis is relatively common; however, premature closure of a facial suture is remarkably rare. We describe an adolescent male with zygomaticotemporal synostosis that manifested as progressive midfacial and orbital asymmetry, angulation of the cranial base, and nasal deviation. To our knowledge, this is the first description of this anomaly in the literature.
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Affiliation(s)
- Gary F Rogers
- Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.
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Cheng ACO, Yuen HKL, Lucas PW, Lam DSC, So KF. Characterization and Localization of the Supraorbital and Frontal Exits of the Supraorbital Nerve in Chinese: An Anatomic Study. Ophthalmic Plast Reconstr Surg 2006; 22:209-13. [PMID: 16714932 DOI: 10.1097/01.iop.0000217795.30085.7a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE To elucidate the characteristics and location of the supraorbital and frontal exits of the supraorbital nerve in Chinese skulls and to compare these findings with other ethnic populations. METHODS The anatomy of the supraorbital nerve exits was studied in 97 adult Chinese skulls (194 orbits). The characteristics and location of the supraorbital nerve exits were determined. Analyses were performed to compare differences between sexes and sides. Data were then compared with those of the other populations. RESULTS Supraorbital exits were found in all 194 orbits. Among these, 89 (45.9%) were foramina. Frontal exits were found in 69 of the 194 (35.6%) orbits in which 18 were foramina (9.3%). The location of the supraorbital exits showed a skewed distribution toward the medial aspect of the superior orbital rim. The median distance between the supraorbital exits and the facial midline was 24.56 mm. Eighty percent of the supraorbital exits lay between 20.77 mm and 30.52 mm from the facial midline. The mean frontal exit was 7.02 mm medial to the supraorbital exits. Compared with other populations, a higher proportion of Chinese have foramina above the superior orbital rim as the exits for the supraorbital neurovascular bundle. The location of the supraorbital nerve exit is highly variable in all studied populations. CONCLUSIONS In a significant proportion of Chinese, the supraorbital nerve exits are located toward the medial aspect of and above the superior orbital rim. Extra care should be taken during dissection around this region to avoid damage to the supraorbital nerve.
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Affiliation(s)
- Andy C O Cheng
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong Eye Hospital, Hong Kong Special Administrative Region.
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Hardie S, Hancock P, Rodway P, Penton-Voak I, Carson D, Wright L. The enigma of facial asymmetry: is there a gender-specific pattern of facedness? Laterality 2005; 10:295-304. [PMID: 16020367 DOI: 10.1080/13576500442000094] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Although facial symmetry correlates with facial attractiveness, human faces are often far from symmetrical with one side frequently being larger than the other (Kowner, 1998). Smith (2000) reported that male and female faces were asymmetrical in opposite directions, with males having a larger area on the left side compared to the right side, and females having a larger right side compared to the left side. The present study attempted to replicate and extend this finding. Two databases of facial images from Stirling and St Andrews Universities, consisting of 180 and 122 faces respectively, and a third set of 62 faces collected at Abertay University, were used to examine Smith's findings. Smith's unique method of calculating the size of each hemiface was applied to each set. For the Stirling and St Andrews sets a computer program did this automatically and for the Abertay set it was done manually. No significant overall effect of gender on facial area asymmetry was found. However, the St Andrews sample demonstrated a similar effect to that found by Smith, with females having a significantly larger mean area of right hemiface and males having a larger left hemiface. In addition, for the Abertay faces handedness had a significant effect on facial asymmetry with right-handers having a larger left side of the face. These findings give limited support for Smith's results but also suggest that finding such an asymmetry may depend on some as yet unidentified factors inherent in some methods of image collection.
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Affiliation(s)
- Scott Hardie
- Division of Psychology, School of Social & Health Sciences, University of Abertay Dundee, UK.
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