Study of morphology of hundred dry human mandibles

Bharathi Rani, S (2012) Study of morphology of hundred dry human mandibles. Masters thesis, Madurai Medical College, Madurai.

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Abstract

INTRODUCTION: Mandible is the largest, hardest and the most durable bone of the skull, which has various morphological features which show changes with reference to age, sex and race. The mandible is a Latin word which means lower jaw that serves for the reception of the lower teeth and gives insertion to the muscles of mastication. It is the only movable bone of the skull articulating with the temporal bone at the synovial temporo - mandibular joint. In the present forensic scenario, dismemberment or mutilation of the body has become the frequent method to conceal the identity of the victim. Thus, identification of human skeletal remains becomes important. When entire adult skeleton is available for analysis, identification is relatively easy, but in cases of mass disasters where usually fragmented bones are found, identification becomes very difficult with the available parts of skeletal remains. AIM OF THE STUDY: To study the morphology and morphometry of mandible in hundred dry specimens. MATERIALS AND METHODS: Hundred dry human mandibles were selected randomly irrespective of age and sex. Defective and broken specimens, totally edentulous mandibles were excluded from the study. Using Digital vernier caliper, the following parameters were measured and analysed- Bigonial width, height of the ramus, maximum breadth of the ramus, minimum breadth of the ramus, symphyseal height and Mental foramen- it’s distance from lower border of mandible, situational variability, accessory foramen. RESULTS: Bigonial width, height of the ramus, maximum breadth of the ramus, minimum breadth of the ramus, and the symphyseal height showed significant sexual dimorphism. Only 3% of the mandibles cannot be sexually categorised considering bigonial width and maximum breadth of the ramus whereas 23% could not be categorised using height of the ramus, minimum breadth of the ramus and symphyseal height. In 73 to 74% mandibles the distance of the mental foramen from the lower border of the mandible was found to be within the normal range of 13–15 mm on both sides. Only 6-7% showed extreme deviation with a minimum of 9.4mm and a maximum of 17.1 mm. Accessory foramen was found mostly on the left side and only one showed accessory foramen on right side. Bilaterally absent mental foramen, an extremely rare variation was also seen. CONCLUSION: This study may be helpful to the maxillofacial surgeons and anthropologists for identification of different populations and also to identify the unnoticed variations of the mental foramen which is essential to prevent the neurovascular complications in the mental region.

Item Type: Thesis (Masters)
Uncontrolled Keywords: morphology, hundred dry human mandibles.
Subjects: MEDICAL > Anatomy
Depositing User: Subramani R
Date Deposited: 05 Oct 2019 10:35
Last Modified: 05 Oct 2019 10:35
URI: http://repository-tnmgrmu.ac.in/id/eprint/11691

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