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Fu F, Luximon A, Luximon Y. 3D human ear modelling with parameterization technique and variation analysis. ERGONOMICS 2024; 67:638-649. [PMID: 37482812 DOI: 10.1080/00140139.2023.2236820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 07/08/2023] [Indexed: 07/25/2023]
Abstract
Anthropometry is vital to provide design references when seeking proper product fit. Nowadays, 3D anthropometry is widely used to provide more size and shape details for improving product designs. However, 3D ear anthropometry is still at an explorative stage, considering the complex ear morphology and other technical obstacles. The proposed research method in this study is applicable to analyse the 3D point cloud of the entire external ear. With the cross-parameterisation technique, the dataset was used to explore the morphological characteristics of the ear. Ear dimensions were automatically extracted and further analysed to explore the gender and symmetry differences using two-way ANOVA. The 3D ear models were investigated through Principal Component Analysis (PCA). The most significant variation was found in the helix and concha region, and the overall ear size is the second important factor determining ear variance. The statistical models were generated as 3D design references for ear-related products.Practitioner summary: This study revealed the morphological variations of the entire 3D external ear with a parameterised 3D ear dataset. Based on the PCA findings, a set of statistical models were generated as design references for product evaluation digitally or physically.
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Affiliation(s)
- Fang Fu
- School of Arts and Design, Shenzhen University, Shenzhen, Guangdong, China
- School of Design, Hong Kong Polytechnic University, Hong Kong, China
| | | | - Yan Luximon
- School of Design, Hong Kong Polytechnic University, Hong Kong, China
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Hiware SD, AlFaqeeh KA, Alattallah SS, Faisal AY, Alessa AM, Amalraj VC, Ismail EE, Bayer SB, Singh BR, Gajbe U. Morphometric Parameters of the Ear and Their Sexual Dimorphism in the Eastern Province of Saudi Arabia. Cureus 2024; 16:e51625. [PMID: 38196990 PMCID: PMC10775136 DOI: 10.7759/cureus.51625] [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: 12/25/2023] [Accepted: 01/03/2024] [Indexed: 01/11/2024] Open
Abstract
Background The human ear is a distinctive facial feature, revealing valuable information about ethnicity, gender, and age. Anthropometric measures play a crucial role in fields such as forensic medicine, prosthetics, and plastic surgery. The external ear, known for its diversity in structure and individual characteristics, has become a subject of interest in various populations. This study aims to determine the mean values of morphometric measurements for both right and left ears while exploring sexual dimorphism in ear dimensions. Methodology A prospective, observational, cross-sectional study was conducted among 200 volunteers from the eastern province of Saudi Arabia, comprising 98 males and 102 females, at the Department of Anatomy, Institute of Medical Sciences, Imam Abdulrahman Bin Faisal University. Participants were randomly selected from King Fahad University Hospital workers and patients. Using a Vernier caliper and after obtaining consent, various aspects of ear morphology were measured. The study employed statistical analyses such as the volunteers' t-test, Pearson's coefficient of correlation, and linear regression equations. Results In males, the mean total height of the right and left ears was 6.054 ± 0.5394 and 6.044 ± 0.5235 cm, respectively, while for females, it was 5.489 ± 0.4481 and 5.763 ± 4.8446 cm, respectively. The mean widths, heights, and other dimensions of the ears exhibited variations between genders. Conclusions The study provides comprehensive insights into the dimensions and indices of the pinna among the population of the eastern province of Saudi Arabia. The findings confirmed the presence of sexual dimorphism in the ear measurements, consistent with observations in other ethnic groups.
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Affiliation(s)
- Sanket D Hiware
- Anatomy, Graphic Era Institute of Medical Sciences, Dehradun, IND
| | - Khaled A AlFaqeeh
- Anatomy, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Salim S Alattallah
- Anatomy, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Abdullah Y Faisal
- Anatomy, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Abdullah M Alessa
- Anatomy, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - V Christopher Amalraj
- Development and Community, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Essam E Ismail
- Anatomy, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Sujatha B Bayer
- Anatomy, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Brij Raj Singh
- Anatomy, Datta Meghe Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Ujwal Gajbe
- Anatomy, Datta Meghe Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
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Angelakopoulos N, Franco A, Sezgin N, Cevik ZA, Canturk N, Panciera MC, Pinto PHV, Alves da Silva RH, Balla SB, Kumagai A, Zolotenkova G, Silveira Sousa AM, Ferrante L, Cameriere R. Ear identification: A multi-ethnic study sample. Morphologie 2023; 107:100602. [PMID: 37230829 DOI: 10.1016/j.morpho.2023.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 05/09/2023] [Accepted: 05/10/2023] [Indexed: 05/27/2023]
Abstract
The external human ear is considered to be highly variable among individuals. Hence, forensic applications could be explored for human identification. This research compares the usefulness of Cameriere's ear identification method, in samples originating from six different countries (Brazil, India, Japan, Russia, South Africa and Turkey) in order to examine possible differences in their accuracy values. A sample of 2,225 photographs of the external human ear (1,134 left and 1,091 right ears) from 1,411 individuals (633 females and 778 males) was collected. The samples included healthy subjects with no systemic disorders and without any craniofacial trauma, maxillofacial abnormalities, auricular anomalies, ear diseases or previous auricular surgery. Cameriere's ear identification method was applied and measurements were performed on the images of each ear, considering four anatomic regions: helix, antihelix, concha, and lobe. The quantified measurement values were converted into a proposed coded number system. A search for identical codes was accomplished to find out the distinctiveness of the morphology of the human ear. The combined codes of left and right ears of each of the 814 subjects were not repeated in this multi-ethnic study sample. Dirichlet's distribution and the inherent study equation showed that the probability of two different individuals having the same code (false-positive identification) was found to be <0.0007. Because of the distinctive metrics of the ratios of external human ears, studies with Cameriere's ear identification method may be valuable for human identification. Studying the differences between the left and right ears of the same individual and across different ethnic groups could contribute to the development of supplementary tools for human identification.
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Affiliation(s)
- N Angelakopoulos
- Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Freiburgstrasse 7, 3010 Bern, Switzerland; Department of Medicine and Health Sciences "Vincenzo Tiberio", University of Molise, AgEstimation Project, Campobasso, Italy.
| | - A Franco
- Division of Forensic Dentistry, Faculdade São Leopoldo Mandic, Campinas, Brazil
| | - N Sezgin
- Department of Forensic Sciences, Faculty of Engineering and Natural Sciences, Kütahya Health Sciences University, Kutahya, Turkey
| | - Z A Cevik
- Department of Forensic Medicine, Medical School, Ankara University, Ankara, Turkey
| | - N Canturk
- Department of Forensic Medicine, Medical School, Ankara University, Ankara, Turkey
| | - M C Panciera
- Department of Pathology and Forensic Medicine, USP - University of São Paulo, Ribeirão Preto Medical School, Ribeirão Preto, SP, Brazil
| | - P H V Pinto
- Department of Pathology and Forensic Medicine, USP - University of São Paulo, Ribeirão Preto Medical School, Ribeirão Preto, SP, Brazil
| | - R H Alves da Silva
- Department of Stomatology, Public Health and Forensic Odontology, School of Dentistry of Ribeirão Preto, USP - University of São Paulo, Ribeirão Preto, SP, Brazil
| | - S B Balla
- La Trobe Rural Health School, La Trobe University, Bendigo, Australia
| | - A Kumagai
- Department of Forensic Science, Division of Forensic Odontology and Disaster Oral Medicine, Iwate Medical University, Iwate, Japan
| | - G Zolotenkova
- Department of Forensic Medicine, Sechenov First Moscow State Medical University, Moscow, Russia
| | - A M Silveira Sousa
- School of Dentistry of Ribeirão Preto, USP-University of São Paulo, Ribeirão Preto, SP, Brazil
| | - L Ferrante
- Polytechnic University of Marche, Center of Epidemiology, Biostatistics and Medical Information Technology, Department of Biomedical Science and Public Health, Ancona, Italy
| | - R Cameriere
- Department of Medicine and Health Sciences "Vincenzo Tiberio", University of Molise, AgEstimation Project, Campobasso, Italy
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Bahşi İ, Orhan M, Kervancioğlu P, Karatepe Ş, Sayin S. External Ear Anthropometry of Healthy Turkish Young Adults. J Craniofac Surg 2023; 34:e799-e803. [PMID: 37643081 DOI: 10.1097/scs.0000000000009708] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 06/27/2023] [Indexed: 08/31/2023] Open
Abstract
PURPOSE The aim of this study was to determine the external ear values in Turkish young adults with 2-dimensional photogrammetry. METHODS One hundred males and 100 females aged between 18 and 25 years were included in the study. Individuals were photographed from both sides. Ear length (superaurel-subaurel, spa-sba ), ear width (preaurel-postaurel, pra-pa ), and the angle between the vertical axis of the auricle and the line between spa and sba (ear incline angle, eia ) were measured in these photographs. Also, auricular index ( pra-pa / spa-sba ×100) was calculated. RESULTS The average values of the spa-sba, pra-pa , eia , and auricular index were found as 65.46±4.68 mm, 37.89±3.61 mm, 19.40±4.83 degrees, and 57.93±4.53 in males and 60.90±5.35 mm, 35.62±3.69 mm, 17.95±4.86 degrees, and 58.65±5.29 in females, respectively. While the values of spa-sba ( P =0.001 for the right side and P =0.001 for the left side), pra-pa ( P =0.001 for the right side and P =0.001 for the left side), and eia ( P =0.024 for the right side and P =0.041 for the left side) were statistically higher for males than females, there was no statistically significant difference between the sex and the auricular index ( P =0.404 for the right side and P =0.955 for the left side). Besides, there was no statistically significant difference between the sides for these 4 parameters ( P =0.760, 0.409, 0.225, and 0.521, respectively). CONCLUSION The authors believe that the results obtained for Turkish young adults can be used as reference values, which can be used in the diagnosis, follow, or surgical treatment of many diseases, forensic procedures, and planning esthetic surgery procedures.
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Affiliation(s)
- İlhan Bahşi
- Department of Anatomy, Faculty of Medicine, Gaziantep University
| | - Mustafa Orhan
- Department of Anatomy, Faculty of Medicine, Gaziantep University
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Sowmya MV, Mehrotra D, Mohammad S, Singh R, Tiwari AK, Katrolia R, Sharma Yogesh S. 3D assessment of ear morphology. J Oral Biol Craniofac Res 2023; 13:622-629. [PMID: 37600501 PMCID: PMC10432210 DOI: 10.1016/j.jobcr.2023.08.001] [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: 03/10/2023] [Revised: 04/30/2023] [Accepted: 08/02/2023] [Indexed: 08/22/2023] Open
Abstract
Introduction Auricular reconstruction is a technically challenging and aesthetically demanding procedure as the ear has a complex anatomy. Anthropometry aids in achieving aesthetic ear reconstruction. We considered that implication of stereophotogrammetric technology will lead to a better understanding of human ear morphology. Material and methods A cross-sectional study was conducted in our institutional OPD in a tertiary health care centre in the Northern part of India.400 people were chosen based on selection criteria. facial scans were done for 3D pictures using Canfield VECTRA® H2 3D imaging device. Study variables were assessed after marking landmarks on the 3D-generated auricular image of an individual. Discussion This study consisted of 55.5% males and 44.5% females belonging to the age group of 5-25 years (30.3%), 26-40 years (38.8%) and>40 yr (31.0%). Out of 400 cases, the majority had; oval shaped auricle, normally rolled helix, square earlobe; knob shaped tragus. The attached type of earlobe attachment was more in the right auricle (37%) and the partial attachment ear lobe was more in the left side auricle (35.5%). Darwin's tubercle showed more proportion in the case of males. The mean length and width of the auricle & attachment length are higher in males compared to females. Ear Angulation is highest among females. Conclusion Assessment of ear morphology using technologically sound methods like stereophotogrammetry paves the way for a more quick, reliable and easy-to-use method for understanding ear morphology. Precise assessment of ear morphology using stereophotogrammetry helps in providing more cosmetic and acceptable ear restoration.
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Affiliation(s)
- Meleti Venkata Sowmya
- Department of Oral and Maxillofacial Surgery, King George Medical University, Lucknow, India
| | - Divya Mehrotra
- Department of Oral and Maxillofacial Surgery, King George Medical University, Lucknow, India
| | - Shadab Mohammad
- Department of Oral and Maxillofacial Surgery, King George Medical University, Lucknow, India
| | - R.K. Singh
- Department of Oral and Maxillofacial Surgery, King George Medical University, Lucknow, India
| | - Arunesh Kumar Tiwari
- Department of Oral and Maxillofacial Surgery, King George Medical University, Lucknow, India
| | - Ravi Katrolia
- Department of Oral and Maxillofacial Surgery, King George Medical University, Lucknow, India
| | - Shivani Sharma Yogesh
- Department of Oral and Maxillofacial Surgery, King George Medical University, Lucknow, India
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Rani D, Krishan K, Kanchan T. A methodological comparison of discriminant function analysis and binary logistic regression for estimating sex in forensic research and case-work. MEDICINE, SCIENCE, AND THE LAW 2023; 63:227-236. [PMID: 36366800 DOI: 10.1177/00258024221136687] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The purpose of this study is to assess the accuracy of two multivariate statistical approaches for estimating sex from human external ear anthropometry, namely, discriminant function analysis (DFA) and binary logistic regression (BLR). A cross-sectional sample of 497 participants (233 males and 264 females) aged 18-35 years (24.42 ± 5.17) was obtained from Himachal Pradesh state of North India. Both the ears of the participants (994) were examined for anthropometric measurements. A total of 12 anthropometric measurements were taken independently on the left and right ear of each individual with the help of a pair of sliding calipers using a standard method. The sex of the population groups was discriminated against using binary logistic regression and discriminant function analysis. The predictive percentage of sex estimation computed from both the models were substantially the same, that is, 76.3% from DFA and 76.2% from BLR, with nearly comparable (∼0.02) sensitivity, specificity, positive predictive value, and negative predictive values, whereas the values of correct predicted percentage were 0.1% higher in DFA than BLR. Moreover, the other comparison metrics, such as classification error, B-index, and Matthews correlation coefficient indicated that both models performed equally well. The study highlighted that if the assumptions of the statistical methods are met, both methods are equally capable of discriminating the population depending on sex. The study recommends that the discriminant function analysis and binary logistic regression may be used synonymously in forensic research and case-work pertaining to the estimation of sex and various other forensic situations.
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Affiliation(s)
- Deepika Rani
- Department of Anthropology, Panjab University, Chandigarh, India
| | - Kewal Krishan
- Department of Anthropology, Panjab University, Chandigarh, India
| | - Tanuj Kanchan
- Department of Forensic Medicine, All India Institute of Medical Sciences, Jodhpur, India
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Rani D, Krishan K, Kanchan T. Association among the morphological characteristics of the human ear – An approach towards forensic identification. FORENSIC SCIENCE INTERNATIONAL: REPORTS 2022. [DOI: 10.1016/j.fsir.2022.100295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Wang M, Fan H, Yu S, Wang L, Chu J, Tang X, Li W, Zhao X, Zhang S, Chen D. Analysis of the auricles and auricular shape types for ear-related wearables: A study of mainland Chinese sample aged 15–79. Work 2022; 73:335-352. [DOI: 10.3233/wor-210799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND: Comprehension of the complex shape of the auricle and how it differs in terms of factors such as sex, age, and side have become an imperative aspect of the fabrication and service delivery of products that are natural, functional, and healthy for users. OBJECTIVE: This study was aimed at providing a clear understanding of the anthropometric characteristics based on age, sex, size, and side and shape type of the auricles of mainland Chinese samples. METHODS: Casting and 3D scanning were employed to obtain eighteen auricular measurement variables from 1120 subjects (aged 15–79). Examination of sex-related and bilateral differences were conducted. Furthermore, factor analysis was employed to establish the factors associated with the variations in auricular shape. Also, hierarchical cluster analysis was performed to classify the auricular shapes of individuals. RESULTS: The auricular inclination angle, conchal depth and tragal height did not exhibit any specific trend across the age groups. No significant bilateral difference was observed in both genders. The auricular shapes were classified into five types according to six major factors. CONCLUSIONS: It was observed that measurement variables of the Chinese auricles changed continuously with age, with most of the linear variables exhibiting a steady increase. The apparent strong association between the auricular types and age groups indicate that a person’s auricular shape may change with age.
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Affiliation(s)
- Mengcheng Wang
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
- School of Public Health, University of California Berkeley, Berkeley, CA, USA
| | - Hao Fan
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
- School of Public Health, University of California Berkeley, Berkeley, CA, USA
| | - Suihuai Yu
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
| | - Long Wang
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
| | - Jianjie Chu
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
| | - Xing Tang
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
| | - Wenhua Li
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
| | - Xiao Zhao
- Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA, USA
| | - Shuai Zhang
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
- School of Art and Design, Changsha University of Science & Technology, Changsha, China
| | - Dengkai Chen
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi’an, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi’an, China
- School of Public Health, University of California Berkeley, Berkeley, CA, USA
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Erdem S, Fazliogullari Z, Ural A, Karabulut AK, Unver Dogan N. External ear anatomy and variations in neonates. Congenit Anom (Kyoto) 2022; 62:208-216. [PMID: 35751443 DOI: 10.1111/cga.12483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/14/2022] [Accepted: 05/06/2022] [Indexed: 11/30/2022]
Abstract
It is aesthetically important that the auricle has a natural and beautiful shape. The sizes, position and symmetry of normal auricle are used for different purposes in different disciplines. A deformation in the auricle of neonates and its size or location on the face may indicate a possible anomaly. The aim of this study is to investigate the normal sizes, anomaly types, anomaly rates and the relationship between hearing screening test results and auricular anomaly of the neonatal auricle. The length, width, angle, and distance measurements of the auricle were made in neonates (n = 550). Anomaly types of auricle were observed. Goniometer was used to measure angles; digital caliper and ruler were used to measure lengths. Anomalies were detected by the method of observation. In the morphometric data of the neonatal auricle, differences were determined in length and width values in terms of gender. Various types of anomalies were observed in the right ear of 96 participants and in the left ear of 103 participants. Normal auricle size, position and symmetry are important for surgical reconstructions, hearing aid design, producing data banks on gender, age and ethnicity, and providing reference information for multiple diagnostic and forensic procedures. Recognition and early detection of auricular anomalies play an essential role in clinical diagnosis and their correction with special devices.
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Affiliation(s)
- Saadet Erdem
- Faculty of Health Sciences, Bolu Abant Izzet Baysal University, Bolu, Turkey
| | | | - Ahmet Ural
- Department of Otolaryngology, Medical Faculty, Bolu Abant Izzet Baysal University, Bolu, Turkey
| | | | - Nadire Unver Dogan
- Faculty of Medicine, Department of Anatomy, Selcuk University, Konya, Turkey
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Sun H, Sun P, Jiang H, Yang Q, Li T, Pan B. Anthropometric assessment of microtia patients' normal ears and discussion on expander selection in auricular reconstruction surgery. Sci Rep 2022; 12:4521. [PMID: 35296747 PMCID: PMC8927408 DOI: 10.1038/s41598-022-08596-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 03/09/2022] [Indexed: 11/09/2022] Open
Abstract
The tissue expansion technique is the most suitable procedure for Chinese patients with microtia. However, it is difficult to determine whether the expanded flap is sufficient, and there are no clear or objective guidelines for determining the volume of the expander for different sizes of auricles. One hundred patients with unilateral microtia who visited our department in 2021 were randomly selected for auricular data collection using 3D scanning. The auricle length, width, projection, perimeter, and surface area were measured. Eight different volumes of expanders underwent CT and the surface areas of these expanders were measured. The surface areas of the auricles and expanders were compared and the correlation between them was explored. The average auricle parameters were calculated. The scatter plot showed a linear relationship between auricle length and auricle surface area (R2 = 0.9913), which demonstrated that the auricle area was approximately equal to the auricle length multiplied by 76.921. Additionally, the surface area of the expanders was measured and made into a table for selection against the surface area of the auricles. Using our equation, the auricle surface could be estimated by simply measuring the non-defective auricle length; therefore, the suitable volume of the expander could be determined.
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Affiliation(s)
- Hefeng Sun
- External Ear Plastic and Reconstructive Center, Department of Plastic Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 33, Ba-Da-Chu Road, Shi Jing Shan District, Beijing, 100144, China
| | - Pengfei Sun
- External Ear Plastic and Reconstructive Center, Department of Plastic Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 33, Ba-Da-Chu Road, Shi Jing Shan District, Beijing, 100144, China
| | - Haiyue Jiang
- External Ear Plastic and Reconstructive Center, Department of Plastic Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 33, Ba-Da-Chu Road, Shi Jing Shan District, Beijing, 100144, China
| | - Qinghua Yang
- External Ear Plastic and Reconstructive Center, Department of Plastic Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 33, Ba-Da-Chu Road, Shi Jing Shan District, Beijing, 100144, China
| | - TongTong Li
- External Ear Plastic and Reconstructive Center, Department of Plastic Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 33, Ba-Da-Chu Road, Shi Jing Shan District, Beijing, 100144, China
| | - Bo Pan
- External Ear Plastic and Reconstructive Center, Department of Plastic Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 33, Ba-Da-Chu Road, Shi Jing Shan District, Beijing, 100144, China.
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Evaluation of the External Ear and Head Anthropometric Dimensions Among Fars and Turk Workers for the Ergonomic Design of the Earmuffs. HEALTH SCOPE 2022. [DOI: 10.5812/jhealthscope.100506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background: Anthropometry plays an important role in the ergonomic design of hearing protection equipment and its compatibility with the dimensions of the external ear and head of workers. Few studies have been conducted on the dimensions of the external ears and heads of workers in Iran with different ethnicities. Objectives: This study aimed to collect the anthropometric dimensions of the external ear and head of workers of two prominent ethnicities of Iran for the ergonomic design of earmuffs. Methods: Following a cross-sectional design, this study was performed on 300 male workers (150 Turk and 150 Fars) aged 20 - 60 years. Anthropometric dimensions of the external ear and head were measured using a spreading caliper, camera, tripod, and tape measure. Photographs were analyzed using Digimizer V5.3.5 software, and data were analyzed using SPSS 21. Results: The mean age of Turk and Fars workers was 33.51 ± 5.41 and 33.95 ± 6.05 years, respectively. The ear shape was oval in more than half of the male workers of the two studied ethnicities. There was a positive correlation between anthropometric dimensions of head and ears in both ethnicities. The 95th percentile of the length and width of the pinna in Fars and Turk workers was larger than the average dimensions of inner ring earmuffs. Conclusions: Hearing protection devices available in the Iranian market should be examined to fit the ear dimensions of different Iranian ethnicities. External ear anthropometric data obtained from this study can be used to redesign the earmuffs in Fars and Turk male workers.
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Khobkhun P, Pungrasmi P, Suwajo P, Nilprapha K, Meevassana J, Promniyom P, Angspatt A, Jindarak S, Iamphongsai S. An anthropometric study of the external ear in the Thai population. J Plast Reconstr Aesthet Surg 2021; 75:1417-1423. [PMID: 34955402 DOI: 10.1016/j.bjps.2021.11.065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 07/14/2021] [Accepted: 11/11/2021] [Indexed: 11/30/2022]
Abstract
Auricular dimensions are important data for the treatment of auricular deformities, either congenital or acquired. Many previous studies have shown that the auricular dimension varies among ethnic groups; however, there are currently no available data for the Thai population. The objective of this investigation was to provide normative values regarding the adult ear dimensions in Thailand. A total of 200 Thai volunteers between the ages of 18 and 70 years (80 men, 120 women) were enrolled in this study. We measured six dimensions, including the auricular, lobular, and conchal length and width and the auricular projection at the superaurale and tragal levels. Moreover, we calculated the auricular, lobular, and conchal indices. The selected dimensions of the external ears were shown as means ± standard deviations. These parameters were then compared between the right and left sides, men and women and participants aged ≥50 and <50 years. We found that men have a significantly larger and more projected ear than women do. The length of the entire auricles and the length of the earlobe were also significantly longer in the population ≥50 years than those <50 years. This study provides normative data of the external ear dimension and projection in the adult Thai population. These data can be used to reconstruct the ear and face more appropriately for Thai individuals.
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Affiliation(s)
- Phatwira Khobkhun
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand
| | - Pornthep Pungrasmi
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Burn and Wound Care, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Poonpissamai Suwajo
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand
| | - Kasama Nilprapha
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Burn and Wound Care, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Jiraroch Meevassana
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Burn and Wound Care, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Pasu Promniyom
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Burn and Wound Care, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Apichai Angspatt
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Burn and Wound Care, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Sirachai Jindarak
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Burn and Wound Care, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Seree Iamphongsai
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Road, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Burn and Wound Care, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
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Multi-detector computed tomography for the estimation of sex from sternal medullary cavity measurements in Sudanese individuals. FORENSIC SCIENCE INTERNATIONAL: REPORTS 2021. [DOI: 10.1016/j.fsir.2021.100244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Anthropometric Study of Human Ear: A Baseline Data for Ear Reconstruction. J Craniofac Surg 2021; 33:1245-1249. [PMID: 34629382 DOI: 10.1097/scs.0000000000008199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Creation of an auricular framework plays the main role on first stage of microtia reconstruction. The size of framework is determined based on the size of the contralateral healthy ear and customized with Nagata theory. The height of rib that added behind the previous framework is the same with the projection of the normal ear. But the height of rib needed and framework in bilateral cases is unknown. A population based auricular framework pattern and projection are urgently needed. OBJECTIVES This study aimed at determining the mean values of normal anthropometric measurement of external ear and projection of human ear in males and females and their comparison on either sides and in either sex. MATERIALS AND METHODS Measurements are taken from 524 subjects (96 men and 428 women) aged 17 to 35 years using a Vernier caliper. The parameters measured were total ear height, ear width, lobular height, lobular width, upper pole, middle upper pole, middle pole, lower middle pole, lower pole, each subject's right and left ears. RESULTS Comparisons between gender were performed by independent t test and paired t test for comparison between right and the left ear. All dimensions were significantly different between male and female (P < 0.05) except the right lobular height (P > 0.05). There was no significant difference both side among groups (P < 0.05) except total ear height on female group (P > 0.05). All projection dimensions were significantly different between male and female. There was no significant difference of auricular projection of right and left auricular on the male (P < 0.05) groups except the projection of lower pole. There were significant between auricular projection of right and left ears on the female groups (P > 0.05). CONCLUSIONS These findings suggest that the normal anthropometric study will have implication in the ear reconstruction especially on bilateral cases as a baseline for reconstruction.
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Fan H, Yu S, Wang M, Li M, Zhao X, Ren Y, Zhang S, Chen D, Harris Adamson C. Analysis of the external acoustic meatus for ergonomic design: part II - anthropometric variations of the external acoustic meatus by sex, age and side in Chinese population. ERGONOMICS 2021; 64:657-670. [PMID: 33350898 DOI: 10.1080/00140139.2020.1867769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 12/17/2020] [Indexed: 06/12/2023]
Abstract
For devices worn inside the ear, detailed anthropometric data of the external acoustic meatus (EAM) is needed, yet lacking due to the complex and costly methodology associated with attaining such measurements. The purpose of this study was to provide the anthropometric characteristics of the EAM including variations by age group, sex, and side (right/left). 1400 external ears (700 Chinese subjects) were casted and scanned. A total of 23 EAM dimensions of length, width, angle, circumference and area were measured, most of which changed by age group, sex and side. 19 measurements were larger in males and 17 measurements were larger in left-side ears. Except the entrance length and circumference, measurements were not statistically significant between left- and right-side ears. This study provides key anthropometric measurements of the EAM in a Chinese population which can be used for ergonomic design purposes. Practitioner summary: This study provides an available source for anthropometric variations of the external acoustic meatus by age, gender and side in the Chinese population, which can be used as a reference to improve the fit, comfort and function of in-ear wearable devices.
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Affiliation(s)
- Hao Fan
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi'an, Shaanxi, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi'an, Shaanxi, China
- School of Public Health, University of California Berkeley, Berkeley, CA, USA
| | - Suihuai Yu
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi'an, Shaanxi, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Mengcheng Wang
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi'an, Shaanxi, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi'an, Shaanxi, China
- School of Public Health, University of California Berkeley, Berkeley, CA, USA
| | - Mei Li
- College of Humanities and Arts, University of Finance and Economics, Xi'an, Shaanxi, China
| | - Xiao Zhao
- Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA, USA
| | - Yihui Ren
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi'an, Shaanxi, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Shuai Zhang
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi'an, Shaanxi, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Dengkai Chen
- Key Laboratory of Industrial Design and Ergonomics, Ministry of Industry and Information Technology, Xi'an, Shaanxi, China
- Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Carisa Harris Adamson
- School of Public Health, University of California Berkeley, Berkeley, CA, USA
- Department of Medicine, University of California San Francisco, San Francisco, CA, USA
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Morphometric Analysis of the Mandibular Canal, Anterior Loop, and Mental Foramen: A Cone-Beam Computed Tomography Evaluation. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18073365. [PMID: 33805123 PMCID: PMC8036832 DOI: 10.3390/ijerph18073365] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 03/16/2021] [Accepted: 03/18/2021] [Indexed: 11/16/2022]
Abstract
This study investigated the cone-beam computed tomography (CBCT)-based features of the mandibular canal, mental foramen, anterior loop, and accessory mental foramina with respect to age and sex. A total of 306 CBCT mandibular images were included in this retrospective study to measure the mandibular canal location and extension, the mental foramen position, the presence of the anterior loop, and the accessory mental foramina. The measurements were obtained in sagittal, coronal, and axial views. Descriptive statistics are presented. Sex-related differences, correlations, and comparisons were calculated using SPSS at 5% significance level. The mandibular canal was located more coronal and medial in male patients. The majority of cases had the mental foramen located just apical to the mandibular second premolar with a mean height of 2.94 mm and a mean length of 3.28 mm. Age affected the size of the mental foramen. The mental canal in all cases tended to show a coronal direction. Mesial extension of the anterior loop was found in 66.01% of the images while accessory mental foramina were detected in 2.6%. The complexity of the mandibular canal, mental foramen, anterior loop, and accessory mental foramina among Sudanese patients with respect to age and sex was confirmed.
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Ali FI, Ahmed AA. Sexual and topological variability in palmprint ridge density in a sample of Sudanese population. FORENSIC SCIENCE INTERNATIONAL: REPORTS 2020. [DOI: 10.1016/j.fsir.2020.100151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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18
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MORPHOLOGICAL STUDY OF THE EXTERNAL EAR AMONG THE DAGAABAS IN THE UPPER WEST REGION OF GHANA. SCIENTIFIC AFRICAN 2020. [DOI: 10.1016/j.sciaf.2020.e00408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Taura MG, Adamu LH, Asuku AY, Umar KB, Abubakar M. Adjacent digit fingerprint white line count differences: a pointer to sexual dimorphism for forensic application. EGYPTIAN JOURNAL OF FORENSIC SCIENCES 2019. [DOI: 10.1186/s41935-019-0169-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Sex determination is one of the leading criterion in identification and verification of an individual. However, the potential roles of differences in adjacent fingerprint white line count (FWLC) in sex inference are not well elucidated in the literature especially among Hausa population. The study was conducted to determine sexual dimorphism and predict sex using adjacent digit FWLC difference (adj. DFWLCD) among Hausa population of Kano state, Nigeria.
Methods
The study population involved 300 participants. FWLC was determined from a plain fingerprint captured using live scanner. The formula for adj. DFWLCD of thumb and fifth digit is dR15 for right hand. The same applied for possible combination in cephalocaudal direction. Mann-Whitney and t tests were used for comparison of variables between sexes. Binary logistic regression analyses were employed for determination of sex.
Results
We observed a significantly larger adj. DFWLCD in males compared with females in most of the digit combination. A significant sexual dimorphism was observed in most of the adj. DFWLCD involving ring digit in both right (dR14, dR24, and dR34) and left (dL14, dL24, and dL34). The best discrimination was observed in adjacent FWLC difference of second and fourth digits in both right and left digits (dR24 and dL24). This was further supported by stepwise logistic regression analyses.
Conclusion
The adj. DFWLCD exhibits sexual dimorphism. The best prediction potentials were found to be dR24 and dL24 for right and left hands respectively.
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Krishan K, Kanchan T, Thakur S. A study of morphological variations of the human ear for its applications in personal identification. EGYPTIAN JOURNAL OF FORENSIC SCIENCES 2019. [DOI: 10.1186/s41935-019-0111-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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21
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Lee W, Yang X, Jung H, Bok I, Kim C, Kwon O, You H. Anthropometric analysis of 3D ear scans of Koreans and Caucasians for ear product design. ERGONOMICS 2018; 61:1480-1495. [PMID: 29989490 DOI: 10.1080/00140139.2018.1493150] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Accepted: 06/19/2018] [Indexed: 06/08/2023]
Abstract
The present study measured 25 dimensions of the ear including the concha and ear canal for ergonomic design of ear products and compared with existing ear measurement studies. Scanning and casting methods were employed to produce 3D ear images for 230 Koreans and 96 Caucasians and measurements of the ear dimensions were obtained by identifying 21 landmarks on individual ear scan image. The Korean ear measurements were found significantly larger (mean difference d¯ = 0.4-3.7 mm) and more varied (ratio of SDs =1.01-1.55) than those of Caucasians in most of ear dimensions. The average ear length and ear breadth of male were significantly longer ( d¯ = 1.3-7.0 mm) and wider ( d¯ = 0.8-3.0 mm) than those of female. Use of gender- and ethnicity-composite ear data is recommended in product design due to the much larger intra-population variations (7.5-22.2 mm) than the corresponding inter-population variations. Practitioner Summary: The 3D ear measurements of Koreans and Caucasians were collected and compared with those of different ethnic populations. The distinct ear features of the populations identified in this study are applicable to ergonomic design of ear products with better fit and comfort. Abbreviations: CCW: cavum concha width; CV: coefficient of variation; EB: ear breadth; EL: ear length; SD: standard deviation; SE: sampling error; 3D: 3 dimensional.
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Affiliation(s)
- Wonsup Lee
- a School of Global Entrepreneurship and Information Communication Technology , Handong Global University , Pohang , South Korea
| | - Xiaopeng Yang
- b Department of Industrial and Management Engineering , Pohang University of Science and Technology , Pohang , South Korea
| | - Hayoung Jung
- b Department of Industrial and Management Engineering , Pohang University of Science and Technology , Pohang , South Korea
| | - Ilgeun Bok
- c Design Team, Mobile Communication Division, Samsung Electronics , Seoul , South Korea
| | - Chulwoo Kim
- c Design Team, Mobile Communication Division, Samsung Electronics , Seoul , South Korea
| | - Ochae Kwon
- c Design Team, Mobile Communication Division, Samsung Electronics , Seoul , South Korea
| | - Heecheon You
- b Department of Industrial and Management Engineering , Pohang University of Science and Technology , Pohang , South Korea
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Anatomical Uniqueness of Ear Morphology: A Novel Metrical Approach through Three-Dimensional Superimposition. Plast Reconstr Surg 2018; 141:447-450. [PMID: 29369997 DOI: 10.1097/prs.0000000000004026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Uniqueness of ear morphology has been a widely debated issue in cephaloscopy, but past studies used only two-dimensional approaches. In the current investigation, the right and left ears of 10 healthy adults were imaged twice by stereophotogrammetry at the interval of a few seconds. The ear images obtained from the two acquisitions were superimposed both within subject (group of matches) and among subjects (group of mismatches). A point-to-point root mean square distance was calculated between the two three-dimensional models. Differences according to side and group were assessed by two-way analysis of variance. In total, 200 superimpositions were performed. On average, the point-to-point root mean square distance was 0.31 mm in cases of matches and 1.43 mm in cases of mismatches: differences were statistically significant (p < 0.01). Results provided quantitative data for the assessment of uniqueness of ear morphology, highlighting differences based on their three-dimensional morphology.
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Rubio O, Galera V, Alonso MC. Morphological variability of the earlobe in a Spanish population sample. HOMO-JOURNAL OF COMPARATIVE HUMAN BIOLOGY 2017; 68:222-235. [PMID: 28416164 DOI: 10.1016/j.jchb.2017.03.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2016] [Accepted: 01/03/2017] [Indexed: 11/16/2022]
Abstract
This article shows the morphological variability of the earlobe in a Spanish population of European origin. The frequencies of four lobe characteristics (attachment, contour, modeling, and size) and their degree of expression were studied. The relationship among the characteristics and the differences involving sex and laterality were also considered. The least frequent morphology, and of main use in solving forensic cases, was the very small size with triangle-pulled contour into the skin and crossed-discontinuous modeling. The most frequent morphology, and most clinically useful, was the medium-sized lobe with free-arched contour and eminent or cross-continuous modeling. The characteristics were all symmetric. Size and modeling showed sexual dimorphism. Some characteristics were associated with each other: attachment with contour and modeling and the contour with modeling and size. The least frequent peculiarities were sharp lobe and virgule. The literature is scarce on this matter, practically non-existent for some characteristics, especially modeling and peculiarities. For the first time, the associations of the ear characteristics were analyzed, and this information could be applied to forensic identification.
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Affiliation(s)
- O Rubio
- University Institute of Research in Police Sciences (IUICP), Faculty of Law, Alcalá University, Libreros, 27, Ground Floor, 28802 Alcalá de Henares, Madrid, Spain; Department of Life Science, Alcalá University, 28871 Alcalá de Henares, Madrid, Spain.
| | - V Galera
- University Institute of Research in Police Sciences (IUICP), Faculty of Law, Alcalá University, Libreros, 27, Ground Floor, 28802 Alcalá de Henares, Madrid, Spain; Department of Life Science, Alcalá University, 28871 Alcalá de Henares, Madrid, Spain
| | - M C Alonso
- University Institute of Research in Police Sciences (IUICP), Faculty of Law, Alcalá University, Libreros, 27, Ground Floor, 28802 Alcalá de Henares, Madrid, Spain; Department of Physics and Mathematics, Alcalá University, 28871 Alcalá de Henares, Madrid, Spain
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Ahmed AA. Anthropometric correlations between parts of the upper and lower limb: models for personal identification in a Sudanese population. Forensic Sci Med Pathol 2016; 12:257-66. [PMID: 27379609 DOI: 10.1007/s12024-016-9790-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/14/2016] [Indexed: 10/21/2022]
Abstract
PURPOSE Identification of a deceased individual is an essential component of medicolegal practice. However, personal identification based on commingled limbs or parts of limbs, necessary in investigations of mass disasters or some crimes, is a difficult task. Limb measurements have been utilized in the development of biological parameters for personal identification, but the possibility to estimate the dimensions of parts of limbs other than hands and feet has not been assessed. The present study proposes an approach to estimate the dimensions of various parts of limbs based on other limb measurements. METHODS The study included 320 Sudanese adults, with equal representation of men and women. Nine limb dimensions were measured (five based on the upper limb, four based on the lower limb), and extensive statistical analysis of the distribution of values was performed. RESULTS The results showed that all of the measured dimensions were sexually dimorphic and that there was a significant positive correlation between the dimensions of various parts of limbs. Regression models (direct and stepwise) were developed to estimate the dimensions of parts of limbs based on measurements pertaining to one or more other parts of limbs. CONCLUSIONS The study revealed that the dimensions of parts of the upper and lower limb can be estimated from one another. These findings can be used in medicolegal practice and extended to constructive surgery, orthopedics, and prosthesis design for lost limbs.
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Affiliation(s)
- Altayeb Abdalla Ahmed
- Department of Basic Medical Sciences, College of Medicine, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Mail Code: 3127, P.O. Box 3660, Riyadh, 11481, Kingdom of Saudi Arabia. .,Anatomy Department, Faculty of Medicine, University of Khartoum, P.O. Box 102, Khartoum, Sudan.
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Ahmed AA, Osman S. Topological variability and sex differences in fingerprint ridge density in a sample of the Sudanese population. J Forensic Leg Med 2016; 42:25-32. [PMID: 27227288 DOI: 10.1016/j.jflm.2016.05.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 02/04/2016] [Accepted: 05/04/2016] [Indexed: 10/21/2022]
Abstract
Fingerprints are important biometric variables that show manifold utilities in human biology, human morphology, anthropology, and genetics. Their role in forensics as a legally admissible tool of identification is well recognized and is based on their stability following full development, individualistic characteristics, easy classification of their patterns, and uniqueness. Nevertheless, fingerprint ridge density and its variability have not been previously studied in the Sudanese population. Hence, this study was conducted to analyze the topological variability in epidermal ridge density and to assess the possibility of its application in determining sex of Sudanese Arabs. The data used for this study were prints of all 10 fingers of 200 Sudanese Arab individuals (100 men and 100 women) aged between 18 and 28 years. Fingerprint ridge density was assessed for three different areas (radial, ulnar and proximal) for all 10 fingers of each subject. Significant variability was found between the areas (p < 0.01). Women showed significantly higher ridge density in the three areas for all and each fingers. Men and women showed similar patterns of densities with distal areas being denser than proximal ones. Side asymmetry was more evident in distal areas. Ridge density thresholds for discrimination of sexes were developed. Hence, fingerprints found in forensic examinations/crime scenes can be useful to determine sex of Sudanese individuals based on fingerprint ridge density; furthermore, ridge density can be considered a morphological trait for individual variation in forensic anthropology.
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Affiliation(s)
- Altayeb Abdalla Ahmed
- Anatomy Department, Faculty of Medicine, University of Khartoum, P.O. Box 102, Khartoum, Sudan; Department of Basic Medical Sciences, College of Medicine, King Saud bin Abdulaziz University for Health Sciences, Mail Code: 3127, P.O. Box 3660, Riyadh 11481, Saudi Arabia.
| | - Samah Osman
- Anatomy Department, Faculty of Medicine, University of Khartoum, P.O. Box 102, Khartoum, Sudan
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Ahmed AA, Taha S. Cephalo-facial analysis to estimate stature in a Sudanese population. Leg Med (Tokyo) 2016; 20:80-6. [PMID: 27161929 DOI: 10.1016/j.legalmed.2016.04.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 02/22/2016] [Accepted: 04/24/2016] [Indexed: 11/30/2022]
Abstract
Medico-legal practitioners are often confronted with dismembered remains from which they need to develop a biological profile to establish identity. Accurate estimation of stature is an initial, crucial component of any meaningful medico-legal evaluation. However, sometimes only cephalo-facial remains are available. The most accurate statistical estimations of biological attributes are based on population-specific standards. Therefore, this study assessed the ability to estimate stature using 15 cephalo-facial measurements in 240 Sudanese adults (120 men, 120 women) aged 18-25years. Stature and cephalo-facial measurements of men were significantly higher than those of women. Most of the measurements were significantly correlated with stature (p<0.05), with better correlations for women than for men. The accuracy of stature estimation using sex-specific simple and stepwise multiple regression equations ranged from ±52.53 to ±60.28mm. This study provides new forensic standards for stature prediction in a Sudanese population. However, the equations should be used with caution in forensic cases when the more reliable body parts (e.g., limbs) are not available for human identification.
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Affiliation(s)
- Altayeb Abdalla Ahmed
- Department of Basic Medical Sciences, College of Medicine, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Mail Code: 3127, P.O. Box 3660, Riyadh 11481, Saudi Arabia; Anatomy Department, Faculty of Medicine, University of Khartoum, P.O. Box 102, Khartoum 11111, Sudan.
| | - Samah Taha
- Anatomy Department, Faculty of Medicine, University of Khartoum, P.O. Box 102, Khartoum 11111, Sudan
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