Determination of sexual dimorphism via maxillary first molar teeth in Himachali population

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Abstract

Context:

Sex determination of skeletal remains forms part of archaeological and medicolegal examinations. It is an aspect of forensic odontology. Forensic odontology primarily deals with identification, based on recognition of unique features present in an individual's dental structures. Correct sex determination limits the pool of missing persons to just one half of the population.

Aim of Study:

Purpose of this study is to evaluate the existence of sexual dimorphism and variation in left and right maxillary first molars using bucco-lingual and mesio-distal dimensions in population of Sirmour District, H.P.

Materials and Methods:

Base sample comprised 100 subjects (50 males and 50 females) of an age group ranging from 17 to 25 years.

Statistical Analysis Used:

Unpaired t-test.

Results:

It was observed that the comparison of mean values of bucco-lingual and mesio-distal parameters showed highly statistically significant differences between males and females, measured both intraorally and on study casts. There were no significant differences between the mean values of both the parameters on the left side as compared to right side.

Conclusion:

The study concludes that sexual dimorphism is population specific. Among Himachali people, mesio-distal dimensions and bucco-lingual dimensions of first molar can aid in sex determination.

Related collections

Most cited references 14

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Mandibular canine index--a clue for establishing sex identity.

N G Rao, N N Rao, M L Pai … (1989)

A preliminary study for establishing sex identity by Mandibular Canine Index is described. Seven hundred and sixty six individuals from a South Indian population of either sex, ranging in age from 15 to 21 years, with fully errupted, healthy and non-worn mandibular permanent canines were studied. The data collected was analysed statistically. Accurancy of sex determination identity was found to be 84.3% in the male and 87.5% in the female. The method is simple and inexpensive to conduct and therefore can be applied in Forensic Odontology, as a method for establishing sex identity.

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Odontometric sex assessment in Indians.

Sudeendra Prabhu, Ashith Acharya (2009)

Sex determination of unidentified skeletal remains is important and various hard-tissue parameters have been evaluated towards this end. The dentition is considered as a useful adjunct in skeletal sex determination, particularly since teeth are resistant to postmortem destruction and fragmentation. Sex dimorphism in tooth size and the accuracy of odontometric sex prediction, is found to vary in different regions and researchers have advocated the need for population-specific data. No odontometric standards exist for Indians for use in forensic sex prediction. Therefore, this study examined sexual dimorphism in Indians using univariate and multivariate statistics. Mesiodistal (MD) and buccolingual (BL) measurements of all teeth, except third molars, were obtained on dental casts of [corrected] 105 Indians (52 females, 53 males). The canines were [corrected] found to be the most dimorphic tooth, followed by the [corrected] BL dimensions of [corrected]first molars and that of mandibular second premolars. In general, mandibular teeth and BL dimensions showed greater tendency to be larger in males. However, just over a quarter of the measured variables (16/56; 28.6%) were statistically larger in males (p < 0.05). Moreover, ten tooth variables exhibited reverse dimorphism, i.e. female dimensions were larger than those of males. Stepwise discriminant function analysis revealed moderate accuracy in sex prediction: the teeth from both jaws taken together were able to determine sex to higher levels (76.2%) compared to only mandibular teeth (72.4%) or only maxillary teeth (67.6%). Interestingly, teeth that contributed to the stepwise discriminant analysis were either statistically larger in males or exhibited reverse dimorphism, indicating that such tooth variables may have better ability to correctly identify sex. [corrected]

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Limitations of the mandibular canine index in sex assessment.

Sneedha Mainali, B. S. Acharya (2009)

Measuring teeth is a useful adjunct in sex assessment. Canines, in particular, have the greatest degree of sexual dimorphism, resist disease and survive postmortem trauma, rendering them highly valuable in identification. Hence, their exclusive use in odontometric sex assessment using the Mandibular Canine Index (MCI) has been advocated before. The MCI is derived as the ratio of the mesiodistal (MD) dimension of canines and the inter-canine arch width. This study has tested the use of the MCI in assessing sex on a sample from Nepal and compared its accuracy to that of absolute canine measurements. Measurements were obtained from one hundred-and-seventeen dental stone casts that belonged to 63 males and 54 females, all young adults in the age-group 19-28 years. Independent samples t-test revealed no significant sexual dimorphism in the MCI. In addition, discriminant analysis of the MCI also had poor ability to differentiate the sexes. In contrast, the absolute canine measurements revealed statistically significant male-female difference and superior ability to differentiate sex using discriminant analysis. The poor ability of the MCI in sex assessment is attributed to it being a relative value-it is obtained as the ratio of two absolute measurements (MD dimension of canines and inter-canine arch width) and does not reflect sex differences that exist in the absolute measurements per se.

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Author and article information

Journal

Journal ID (nlm-ta): J Forensic Dent Sci

Journal ID (iso-abbrev): J Forensic Dent Sci

Journal ID (publisher-id): JFDS

Title: Journal of Forensic Dental Sciences

Publisher: Medknow Publications & Media Pvt Ltd (India )

ISSN (Print): 0975-1475

ISSN (Electronic): 0975-2137

Publication date (Print): May-Aug 2015

Volume: 7

Issue: 2

Pages: 90-94

Affiliations

[1] Department of Oral Pathology and Microbiology, Himachal Institute of Dental Sciences, Paonta Sahib, Himachal Pradesh, India

[1 ] Genesis Institute of Dental Sciences and Research, Punjab, India

Author notes

Address for correspondence: Dr. Swati Singla, B/IV-1165, Sazida Colony, Malerkotla (148023), Sangrur, Punjab, India. E-mail: swatisingla2201@ 123456gmail.com

Article

Publisher ID: JFDS-7-90

DOI: 10.4103/0975-1475.156190

PMC ID: 4430581

PubMed ID: 26005295

SO-VID: ce526673-bb8b-4abd-bc54-8903f0e0d274

License:

This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Determination of sexual dimorphism via maxillary first molar teeth in Himachali population

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Abstract

Context:

Aim of Study:

Materials and Methods:

Statistical Analysis Used:

Results:

Conclusion:

Related collections

Arab Journal of Forensic Sciences & Forensic Medicine (AJFSFM)

Most cited references 14

Mandibular canine index--a clue for establishing sex identity.

Odontometric sex assessment in Indians.

Limitations of the mandibular canine index in sex assessment.

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