Mandibular Ramus: An Indicator of Gender and Chronological Age - A Digital Radiographic Study

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D. B. Meleveetil
V. T. Beena
Latha Mary Cheriyan
Kavitha Angamuthu
Bibina Charapparambath

Abstract

Background: The determination of sex and age of individual is important in forensic practice and medico legal purposes. Mandible may play a vital role in sex estimation as it is the most dimorphic bone of skull that often is recovered intact. The present study was conducted to evaluate the reliability of mandibular measurements in gender determination and age estimation as seen on digital panoramic radiographs. Aims and Objectives: The aim of the study was to evaluate and compare seven parameters of the mandibular ramus obtained from digital orthopantomographs, and to assess the usefulness of these parameters as aids in gender and age estimation. The objectives were: 1. To assess:-Maximum ramus breadth in mm, Minimum ramus width in mm, Projective height of ramus in mm, Maximum height of the ramus in mm, Maximum coronoid height in mm, Gonial width in mm and Bigonial angle in degrees, 2. To correlate each of these seven variables with the age of the patient, and 3. To compare these seven parameters between males and females. Materials and Methods: OPGs of 500 patients satisfying inclusion and exclusion criteria selected from the Dept. of Oral Medicine and Radiology, Govt. Dental College, Kottayam, were being studied. Permission from the concerned departments was taken. The measurements were made on this radiograph using GIMP 2.8 Software. Results: All the parameters were found to show statistically significant difference between males and females. After performing logistic regression, an equation was formulated to determine gender from the parameters that were statistically significant in regression analysis. The cut off was set at 0.5. Values above the cut off value were interpreted as males and values below the cut off were interpreted as females. The overall accuracy of sex determination at this cut off value from this method was 73.9%. Significant correlation was not noted between the mandibular parameters and age of the individual. Conclusion: It can be concluded that the mandibular ramus can be considered as a valuable tool in gender estimation since it possesses resistance to damage and disintegration processes. Nevertheless, the age of the individual cannot be determined using this method.

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Author Biography

Kavitha Angamuthu, Former Junior Resident, Government Dental College,  Kottayam − 686008, Kerala

 

 

How to Cite
Meleveetil, D. B. ., Beena, V. T. ., Cheriyan, L. M. ., Angamuthu, K., & Charapparambath, B. (2022). Mandibular Ramus: An Indicator of Gender and Chronological Age - A Digital Radiographic Study. Journal of Forensic Dental Sciences, 12(3), 158–164. https://doi.org/10.18311/jfds/12/3/2020.567

References

  1. Giles E, Elliot O. Sex determination by discriminant function analysis of crania. Am J Phys Anthropol. 1963; 21:53–68. DOI: https://doi.org/10.1002/ajpa.1330210108
  2. Franklin D, O’Higgins P, Oxnard CE, Dadour I. Determination of sex in South African blacks by discriminant function analysis of mandibular linear dimensions: A preliminary investigation using the Zulu local population. Forensic Sci Med Pathol. 2006; b2: 26368.
  3. Ramakrishnan K et al. Sex determination in forensic odontology: A review. J Pharm Bioallied Sci. 2015; 7(2): S398–S402.
  4. Al-Shamout R, Ammoush M, Alrbata R, Al-Habahbah A. Age and gender differences in gonial angle, ramus height and bigonial width in dentate subjects. Pakistan Oral & Dent J. 2012; 32: 81-87.
  5. Kambylafkas P, Murdock E, Gilda E, Tallents RH, Kyrkanides S. Validity of panoramic radiographs for measuring mandibular asymmetry. Angle Orthod. 2006; 76: 388‑93.
  6. Rosas A, Bastir M, Martinez-Maza C, Bermudez de Castro J. Sexual dimorphism in the Atapuerca-SH hominids: the evidence from the mandibles. J Hum Evol. 2002; 42: 451–474. DOI: https://doi.org/10.1006/jhev.2001.0536
  7. Weijs WA, Hillen B. Correlations between the crosssectional area of the jaw muscles and craniofacial size and shape. Am J Phys Anthropol 1986; 70: 423–431. DOI: https://doi.org/10.1002/ajpa.1330700403
  8. Saini V, Srivastava R, Rai RK, Shamal SN, Singh TB, et al. Mandibular ramus: an indicator for sex in fragmentary mandible. J Forensic Sci. 2011; 56 Suppl 1: S13-16.
  9. Pokhrel R, Bhatnagar R. Sexing of mandible using ramus and condyle in Indian population: a discriminant function analysis. Eur J Anat. 2013; 17 (1): 39-42.
  10. Damera A, Mohanalakhsmi J, Yellarthi PK, Rezwana BM. Radiographic evaluation of mandibular ramus for gender estimation: Retrospective study. J Forensic Dent Sci. 2016; 8:74-8. DOI: https://doi.org/10.4103/0975-1475.186369
  11. Indira AP et al. Mandibular ramus: An indicator for sex determination - A digital radiographic study. J Forensic Dent Sci. 2012; 4(2): 58-62. DOI: https://doi.org/10.4103/0975-1475.109885
  12. Kharoshah M. A. A. et al., Sexual dimorphism of the mandible in a modern Egyptian population. J Forensic Legal Med. 2010; 17: 213–215. DOI: https://doi.org/10.1016/j.jflm.2010.02.005
  13. Loth SR, Henneberg M. Mandibular ramus flexure: a new morphological indicator of sexual dimorphism in the human skeleton. Am J Phys Anthropol 1996; 99: 473–485. DOI: https://doi.org/10.1002/(SICI)1096-8644(199603)99:3<473::AID-AJPA8>3.0.CO;2-X
  14. Sambhana S et al. Assessment of sexual dimorphism using digital orthopantomographs in South Indians. J Forensic Dent Sci 2016; 8: 180. DOI: https://doi.org/10.4103/0975-1475.195113
  15. Saini V. Metric study of fragmentary mandibles in a North Indian population. Bull Int Assoc Paleodont. 2013; 7(2): 157-162.
  16. Giles E. Sex determination by discriminant function analysis of the mandible. Am J Phys Anthropol. 1964; 22: 129-35. DOI: https://doi.org/10.1002/ajpa.1330220212
  17. Zangouei-Booshehri M, Aghili HA, Abasi M, Ezoddini‑Ardakani F. Agreement between panoramic and lateral cephalometric radiographs for measuring the gonial angle. Iran J Radiol. 2012; 9: 178-82. DOI: https://doi.org/10.5812/iranjradiol.8444
  18. Steyn M, Iscan MY. Sexual dimorphism in the crania and mandibles of South African Whites. Forensic Sci Int. 1998; 98: 9–16. DOI: https://doi.org/10.1016/S0379-0738(98)00120-0
  19. Taleb NSA, Beshlawy ME (2015) Mandibular Ramus and Gonial Angle Measurements as Predictors of Sex and Age in an Egyptian Population Sample: A Digital Panoramic Study. J Forensic Res 6: 308.
  20. Raustia AM, Salonen MA. Gonial angles and condylar and ramus height of the mandible in complete denture wearers - a panoramic radiograph study. J Oral Rehabil. 1997; 24:512-516. DOI: https://doi.org/10.1046/j.1365-2842.1997.00532.x
  21. Okşayan R et al. Effects of Edentulism on Mandibular Morphology: Evaluation of Panoramic Radiographs. The Scientific World J; 2014: 254932.