American Journal of Medical and Biological Research
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American Journal of Medical and Biological Research. 2018, 6(1), 1-6
DOI: 10.12691/ajmbr-6-1-1
Open AccessArticle

Assessing Ramus Dimorphism of Jordanian Mandibles

Wala M Amin1,

1Faculty of Dentistry, University of Jordan, Amman, Jordan

Pub. Date: February 08, 2018

Cite this paper:
Wala M Amin. Assessing Ramus Dimorphism of Jordanian Mandibles. American Journal of Medical and Biological Research. 2018; 6(1):1-6. doi: 10.12691/ajmbr-6-1-1

Abstract

This investigation deals with descriptively examining the mandibular rami of young Jordanian adults for the presence or the lack of it of a flexure at the posterior border of a ramus; and evaluating the role of ramus flexure in sex identification. Three-dimensional (3D) rendered Cone Beam Computed Tomography (CBCT) images of a normative sample comprising 270 images were selected, of which 147 belonged to male patients and 123 images to females. Strict exclusion criteria were applied in selecting images. Each image was examined for the presence of a flexure on the posterior border of the ramus, which was carefully delineated and the occlusal plane marked, guided by the height of cusp tips of the mandibular molars. The results indicated that the ramus flexure method of sex prediction was more accurately diagnostic for females (85.1%), than for males (78.9%); this gave rise to an overall diagnostic accuracy of 82.2% which is below the reported 90.6-99.0% by Loth & Henneberg. Our results, however, agreed with the reported findings of other researchers. In conclusion, ramus flexure provides an acceptable predictive accuracy and could be considered as a supplementary rather than a definitive mean of sex determination.

Keywords:
sex dimorphism ramus flexure morphologic trait predictive accuracy forensic fossils skeletal remains

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References:

[1]  Balci, Y.; Yavuz, M. F. & CaGdir, S. Predictive accuracy of sexing the mandible by ramus flexure. Homo. 55(3): 229-37, 2005.
 
[2]  Krogman, W. M. & Iscan, M. Y. The human skeleton in forensic medicine. Springfield, C. C. Thomas Publications, 1986.
 
[3]  Novotony, V.; Iscan, M. Y. & Loth, S. R. Morphologic and osteometric assessment of age, sex and race from the skull. In: Iscan, M. Y. & Helmer, R. P. (Eds.). Forensic analysis of the skull. New York, Willy Liss, 1993. pp.71-88.
 
[4]  Loth, S. R. & Henneberg, M. Mandibular ramus flexure: a new morphologic indicator of sexual dimorphism in the human skeleton. Am. J. Phys. Anthropol., 99(3):473-85, 1996.
 
[5]  Loth, S. R. & Henneberg, M. Ramus flexure and symphyseal base shape: sexually dimorphic morphology in the premodern hominid mandible. Am. J. Phys. Anthrop., Suppl. 24:156-7, 1997.
 
[6]  Loth, S. R. & Henneberg, M. Mandibular ramus flexure is a good indicator of sexual dimorphism. Am. J. Phys. Anthropol., 105(1): 91-2, 1998.
 
[7]  Loth, S. R. & Henneberg, M. Gonial eversion: facial architecture, not sex. Homo, 51: 81-9, 2000.
 
[8]  Donnelly, S. M.; Hens, S. M.; Roger, N. L. & Schneider, K. L. Technical note: a blind test of mandibular ramus flexure as a morphologic indicator of sexual dimorphism in the human skeleton. Am. J. Phys. Anthropol., 107(3): 363-6, 1998.
 
[9]  Haun, S. J. Brief communication: a study of the predictive accuracy of mandibular ramus flexure as a singular morphologic indicator of sex in an archaeological sample. Am. J. Phys. Anthropol., 111(3): 429-32, 2000.
 
[10]  Hill, C. A. Technical note: evaluating mandibular ramus flexure as a morphological indicator of sex. Am. J. Phys. Anthropol., 111(4): 573-7, 2000.
 
[11]  Oettlé, A. C.; Pretorius, E. & Steyn, M. Geometric morphometric analysis of mandibular ramus flexure. Am. J. Phys. Anthropol., 128(3): 623-9, 2005.
 
[12]  Suazo, G. I.; San Pedro, V. J.; Schilling, Q. N.; Celis, C. C.; Hidalgo, R. J. & Cantin, L. M. Orthopantomographic blind test of mandibular ramus flexure as a morphological indicator of sex in Chilean young adults. Int. J. Morphol., 26(1): 89-92, 2008.
 
[13]  Tamer, M. Predictive Accuracy of Mandibular Ramus Flexure as a Morphologic Indicator of Sex among Adult Egyptians. Munich, GRIN Verlag, 2012.
 
[14]  Shivaprakash, S. & Vijaykumar, A. G. Sex Determination by Using Mandibular Ramus Posterior Flexure – A Prospective Study. Int. Health Sci. Res., 4(1):155-9, 2014.
 
[15]  Thakur M, Reddy K, Sivaranjani Y, Khaja S. Gender determination by mental foramen and height of the body of the mandible in dentulous patients-A radiographic study. J Indian Acad Forensic Med,3(1):13-18, 2014.
 
[16]  Gamba T, Alves M, Haiter-Neto F. Mandibular sexual dimorphism analysis in CBCT scans. Journal od Forensic and Legal Medicine, 38: 106-110, 2016.
 
[17]  Amin WM and Saleh MW. Accuracy of a customized volumetric rendering program in linear measurement of cone beam and multi-slice computed tomography derived three-dimensional images. J Oral and Maxillofacial Radiology, 3 (2): 33-38. 2015.
 
[18]  World Medical Association (WMA). Declaration of Helsinki–Ethical Principles for Medical Research Involving Human Subjects. Proceedings of the 18th General Assembly, Helsinki, Finland, 1964.
 
[19]  Indrayana, N. S.; Glinka, J. & Mieke, S. Mandibular ramus flexure in an Indonesian population. Am. J. Phys. Anthropol., 105(1): 89-90, 1998.
 
[20]  Saini, V.; Srivastava, R.; Rai RK, Shamal, SN.; Singh, TB.; Tripathi, S. K. Mandibular ramus: an indicator for sex in fragmentary mandibles. J. Forensic Sci. Jan;56 Suppl.1:S 13-6, 2011.
 
[21]  Kemkes-Grottenthaler, A.; Löbig, F. & Stock, F. Mandibular ramus flexure and gonial eversion as morphologic indicators of sex. Homo, 53(2):97-111, 2002.