Orthopantomography and use of Mandibular Indices for the Evaluation of Gender Distribution in Navi Mumbai Population - A Retrospective, Single Blind Study

Introduction: The study of forensic sciences often leaves the forensic expert to draw conclusions from any and every material available in determining the identity of the deceased. The initial step in identifying a person is to determine their gender based on their adult skeleton. The human skeleton displays sexual dimorphism, of which the skull is most dimorphic providing an accurateness of 92%. However, in certain situations where the skull may not be found intact, the mandible plays a vital role. The mandible's thick covering of compact bone helps keep it from exploding during a mass tragedy. Dimorphism in the mandible is gender specific and is mainly reflected in its shape and size. The mandible is also easily radiographed and specific linear measurements of the mandibular rami as seen on an OPG are useful indices for gender determination. Aims: To examine the efficacy of mandibular rami measures such as maximum ramus breadth, maximum ramus height, minimum ramus breadth, condylar height, coronoid height, mandibular body length and gonial angles on the right and left side of an OPG in determining gender. Materials and methods: 110 digital OPG’s (55 males, 55 females) of a Navi Mumbai population were obtained retrospectively from a reputed dental college and hospital. The OPG’s were taken using Xtropan 2000 OPG machine, 10x12 PSP plates, exposure parameters of 75 Kvp, 8 mas, 13 sec, and KODAK CR 7400 digitizer. Master View 3.0 software was used on the desktop computer to measure the mandibular ramus's width and thickness. Maximum ramus breadth, Maximum Ramus height and lowest ramus breadth of the mandibular rami, as well as the height of the condyle and the coronoid bone, and the length of the mandibular body and gonial angles on the right and left sides of the mouth, were all measured. Using a statistical formula, the measurements were substituted and gender was estimated. Result: We used the IBM SPSS v 21.0 statistical software for social sciences to do our statistical study. p0.05 was deemed statistically significant, with a 5% margin of error and a 20% margin of error, giving the study an 80 percent power. In the study group, 51 of the 55 men were expected to be males, while 49 of the 55 females were anticipated to be females, while 6 of the 55 females were predicted to be males. Conclusion: This research shows that the mandibular ramus is a useful tool for determining gender, and digital panoramic imaging yielded the best accurate linear measures. There was considerable sexual dimorphism in the mandibular ramus in the chosen Navi – Mumbai subpopulation, and the combination of 8 factors demonstrated an accuracy of 91.81 percent and was helpful for gender determination.

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Modelling growth curves of the normal infant’s mandible: 3D measurements using computed tomography

Clinical Oral Investigations ◽

10.1007/s00784-021-03937-1 ◽

2021 ◽

Author(s):

Jan Aart M. Schipper ◽

Manouk J. S. van Lieshout ◽

Stefan Böhringer ◽

Bonnie L. Padwa ◽

Simon G. F. Robben ◽

...

Keyword(s):

Computed Tomography ◽

Growth Models ◽

Normal Growth ◽

Growth Patterns ◽

Ct Scans ◽

Mandibular Ramus ◽

Linear Measurements ◽

Mandibular Growth ◽

Gonial Angle ◽

Mandibular Body

Abstract Objectives Data on normal mandibular development in the infant is lacking though essential to understand normal growth patterns and to discriminate abnormal growth. The aim of this study was to provide normal linear measurements of the mandible using computed tomography performed in infants from 0 to 2 years of age. Material and methods 3D voxel software was used to calculate mandibular body length, mandibular ramus length, bicondylar width, bigonial width and the gonial angle. Intra- and inter-rater reliability was assessed for these measurements. They were found to be sufficient for all distances; intra-class correlation coefficients were all above 0.9. Regression analysis for growth modelling was performed. Results In this multi-centre retrospective study, 109 CT scans were found eligible that were performed for various reasons (e.g. trauma, craniosynostosis, craniofacial abscesses). Craniosynostosis patients had larger mandibular measurements compared to non-craniosynostosis patients and were therefore excluded. Fifty-one CT scans were analysed. Conclusions Analysis showed that the mandible increases more in size vertically (the mandibular ramus) than horizontally (the mandibular body). Most of the mandibular growth occurs in the first 6 months. Clinical relevance These growth models provide insight into normal mandibular development in the first 2 years of life. This reference data facilitates discrimination between normal and abnormal mandibular growth.

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Sex Determination Using Inion-Opistocranium-Asterion (IOA) Triangle in Nigerians’ Skulls

Anatomy Research International ◽

10.1155/2014/747239 ◽

2014 ◽

Vol 2014 ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

C. N. Orish ◽

B. C. Didia ◽

H. B. Fawehinmi

Keyword(s):

Sexual Dimorphism ◽

Linear Regression ◽

Coefficient Of Variation ◽

Individual Identification ◽

Male And Female ◽

Gender Determination ◽

Important Concern ◽

Males And Females ◽

The Right

Background. Determination of sex is an important concern to the forensic anthropologists as it is critical for individual identification. This study has investigated the existence of sexual dimorphism in the dimensions and the area of the IOA triangle. Methods. A total of 100 adult dry skulls, (78 males; 22 females) from departments of anatomy in Nigerian universities were used for this study. Automatic digital calliper was used for the measurement. Coefficient of variation, correlation, linear regression, percentiles, and sexual dimorphism ratio were computed from the IOA triangle measurements. The IOA triangle area was compared between sexes. Results. The male parameters were significantly (P<0.05) higher than female parameters. The left opistocranium-asterion length was 71.09±0.56 and 61.68±3.35 mm and the right opistocranium-asterion length was 69.73±0.49 and 60.92±2.10 mm for male and female, respectively. A total area of IOA triangle of 1938.88 mm2 and 1305.68 mm2 for male and female, respectively, was calculated. The left IOA indices were 46.42% and 37.40% in males and females, respectively, while the right IOA indices for males and females were 47.19% and 38.87%, respectively. Conclusion. The anthropometry of inion-opistocranium-asterion IOA triangle can be a guide in gender determination of unknown individuals.

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Relationships Between the Gonial Angle and Mandibular Ramus Morphology in Dentate Subjects: A Panoramic Radiophotometric Study

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-09-00143 ◽

2012 ◽

Vol 38 (3) ◽

pp. 203-210 ◽

Cited By ~ 4

Author(s):

Takahiro Ogawa ◽

Shigeo Osato ◽

Yuichi Shishido ◽

Michio Okada. DDS ◽

Kimiharu Misaki

Keyword(s):

Morphometric Parameters ◽

Mandibular Ramus ◽

Oral Rehabilitation ◽

Men And Women ◽

Panoramic Radiographs ◽

Gonial Angle ◽

Mandibular Body ◽

Post Operation ◽

And Gender ◽

The Right

Analysis of dental panoramic radiographs (DPRs) is an indispensable diagnostic tool for dental implants both pre and post operation. Many studies on linear and angular morphometry of the mandibular body have been conducted, but those on the mandibular ramus have not yet been reported. The purpose of this study was to investigate the differences in the morphometric parameters of the mandibular ramus between high and low gonial angles (GAs) on DPRs as well as between genders, and to determine the relationships between GA and variables of the mandibular ramus morphometry. The DPRs of 156 dentate subjects (78 for each gender) with more than 15 teeth present, a mean age of 49.54 years, and a mean number of teeth of 26.20 were examined. The films were divided into the following 2 groups of GA: less than 120° (low gonial angle, LGA) and more than 125° (high gonial angle, HGA) in both the right and left sides. The parameters for Ar′-Go, MaF-Go, RW, and RD in the LGA group were significantly larger than those in the HGA group in both men and women, but that for the ramus angle (RA) was significantly smaller in the LGA group than in the HGA group. Significant gender differences in the 2 GA groups were recognized with respect to the Ar′-Go, MaF-Go, RW, and RD parameters. Significant negative low and moderate correlations were found between GA and the Ar′-Go, MaF-Go, RW, and RD variables, whereas significant positive low correlation was found between GA and the RA variable. Within the limits of this study, the analysis of the mandibular ramus morphometry on DPRs in terms of GA size and gender was found to be useful for devising a highly predictive and strategic plan for implant-supported oral rehabilitation.

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Cephalometric assessment of effective mandibular ramus height

American Journal of Orthodontics ◽

10.1016/0002-9416(62)90261-0 ◽

1962 ◽

Vol 48 (6) ◽

pp. 471-472

Keyword(s):

Mandibular Ramus ◽

Ramus Height

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Genetics of Differences in Pheromonal Hydrocarbons Between Drosophila melanogaster and D. simulans

Genetics ◽

10.1093/genetics/143.1.353 ◽

1996 ◽

Vol 143 (1) ◽

pp. 353-364 ◽

Cited By ~ 3

Author(s):

Jerry A Coyne

Keyword(s):

Drosophila Melanogaster ◽

Sexual Dimorphism ◽

Genetic Analysis ◽

Species Difference ◽

The Other ◽

Chromosome 3 ◽

Apparent Effect ◽

The Third ◽

Hydrocarbon Profile ◽

The Right

Abstract Females of Drosophila melanogaster and its sibling species D. simulans have very different cuticular hydrocarbons, with the former bearing predominantly 7,11-heptacosadiene and the latter 7-tricosene. This difference contributes to reproductive isolation between the species. Genetic analysis shows that this difference maps to only the third chromosome, with the other three chromosomes having no apparent effect. The D. simulans alleles on the left arm of chromosome 3 are largely recessive, allowing us to search for the relevant regions using D. melanogaster deficiencies. At least four nonoverlapping regions of this arm have large effects on the hydrocarbon profile, implying that several genes on this arm are responsible for the species difference. Because the right arm of chromosome 3 also affects the hydrocarbon profile, a minimum of five genes appear to be involved. The large effect of the third chromosome on hydrocarbons has also been reported in the hybridization between D. simulans and its closer relative D. sechellia, implying either an evolutionaly convergence or the retention in D. sechllia of an ancestral sexual dimorphism.

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Comparative assessment of odontometric parameters for gender determination: A hospital based cross-sectional study

Indian Journal of Forensic and Community Medicine ◽

10.18231/j.ijfcm.2021.030 ◽

2021 ◽

Vol 8 (3) ◽

pp. 147-152

Author(s):

Mosmi Lomi ◽

Jonathan Daniel M

Keyword(s):

Sexual Dimorphism ◽

Cross Sectional Study ◽

Mean Value ◽

The Body ◽

Central Incisor ◽

Maxillary Canine ◽

Cross Sectional ◽

Mean Values ◽

Gender Determination ◽

Significant Difference

Determining gender is one of the most important procedure in forensics. Teeth are made of the most enduring mineralized tissues in the body, as such, they have an extraordinary resistance to putrefaction and the effects of external agents (physical, thermal, mechanical, chemical or biological) which makes them invaluable material for anthropological, genetic, odontologic and forensic examinations.i)To assess the degree of sexual dimorphism in maxillary canine using maxillary canine index, maxillary first molar and central incisor using mesiodistal (MD) and buccolingual/buccopalatal (BL) dimensions of the crown. ii) To determine the accuracy of maxillary canine index, first molar and central incisor dimensions (mesiodistal and buccolingual/buccopalatal) in determining sex.This study consisted of total 30 participants (males=15, females=15) of age group ranging from 20 to 35 yrs. Measurement of dimensions of selected teeth were performed on maxillary cast using digital Vernier caliper, resolution 0.01mm. Data thus obtained were analyzed statistically.The mean values of all the measurements in males were greater than females. There was statistical significant difference in mean value of bucco-lingual width of molar, mesiodistal width of canine (on left side, right side and average) and the inter-canine distance between males and females. The buccolingual width of molar showed the highest % of sexual dimorphism (5.33%) and the mesiodistal width of molar showed the least % of dimorphism (0.7%). Bucco-lingual width of molar posed the highest prediction accuracy for gender determination. We conclude that buccolingual width of maxillary first molar can be used to predict the gender when only teeth of maxillary arch are available for forensic examination.

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Morphometric measurements for sexual dimorphism in the Campolina horse breed

Pesquisa Agropecuária Brasileira ◽

10.1590/s1678-3921.pab2021.v56.02148 ◽

2021 ◽

Vol 56 ◽

Author(s):

Lisia Castro Krebs ◽

Marina Monteiro de Moraes Santos ◽

Maria Claudia Siqueira ◽

Brennda Paula Gonçalves de Araujo ◽

Leonardo Gomes Oliveira ◽

...

Keyword(s):

Sexual Dimorphism ◽

Discriminant Analysis ◽

Sexual Differentiation ◽

Analysis Of Covariance ◽

Classification Error ◽

Horse Breed ◽

Linear Measurements ◽

Morphometric Measurements ◽

Classification Errors ◽

Angular Measurements

Abstract: The objective of this work was to distinguish the sexual dimorphism of horses of the Campolina breed, by morphometric measurements, and to classify them according to sex, using discriminating functions. Two-hundred and fifteen horses were measured, and 39 morphometric measurements were evaluated. The analysis of covariance and the discriminant analysis were performed. Males were taller and showed a wider chest, a greater scapular-humeral angle, and a larger neck, both in length and circumference. Females had a larger heart girth, wider hips, and a greater opening of the coxal-ground and femorotibial angles. Regarding classification, circumference measurements (85.58%) were more accurate in sexual differentiation than the linear (83.26%) and angular (73.02%) ones. As to classification error, of the total animals measured, 10 to 20% of the females were categorized as males. In addition, 11 to 38% of the males were categorized as females. It can be concluded that of the 39 morphometric measurements evaluated, 22 are responsible for sexual dimorphism in the Campolina horse breed. Circumference and linear measurements provide a more assertive classification to determine sexual dimorphism. Angular measurements show greater classification errors regarding the gender of the horses.

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Legal and Ethical Considerations

DNA Fingerprinting ◽

10.1093/oso/9780716770015.003.0013 ◽

1993 ◽

Author(s):

Kenneth E. Melson

Keyword(s):

New York ◽

Dna Analysis ◽

Dna Typing ◽

The United States ◽

Forensic Sciences ◽

Dna Identification ◽

Trial Judge ◽

Margin Of Error ◽

Previous Contact ◽

Her 2

The legal system, in both the criminal and civil arenas, may well be revolutionized by the advent of forensic DNA typing. One state trial judge has written that DNA typing “can constitute the single greatest advance in the ‘search for truth,’ and the goal of convicting the guilty and acquitting the innocent, since the advent of cross examination.” People v. Wesley, 140 Misc.2d 306, 533 N.Y.S.2d 643 (Co. Ct. 1988). A prominent professor in the field of law and forensic sciences believes that “DNA analysis will be to the end of the 20th century what fingerprinting was to the 19th.” The Washington state legislature has found the accuracy of DNA identification to be superior to that of any presently existing technique, and the Maryland General Assembly has proclaimed DNA identification to have been refined to a level of scientific accuracy that approaches an infinitesimal margin of error. Indeed, the forensic applications of DNA typing are limited only by the circumspection of the criminal mind. Regardless of the type of crime committed, whenever trace evidence appropriate for DNA analysis is left behind by the perpetrator and later recovered by the police, the test results can be an important investigative tool. Most frequently, such evidence will be found as a result of violent crimes. With 92,490 rapes and 20,680 homicides in the United States in 1988, the forensic application of DNA typing should significantly increase the arrest and conviction rates. The use of DNA typing is not confined to those cases in which body fluids, hairs, or tissue are left at the crime scene or on the victim by the perpetrator, thereby connecting a suspect to the scene or victim. Just as common is the situation where evidence is left by a victim on the suspect or the suspect’s belongings, which will establish previous contact between the accused and the victim. The Joseph Castro case is an example of this situation. He was accused in New York of stabbing to death a 20-year-old woman who was seven months pregnant and her 2-year-old daughter.

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