Orbital indices in a modern Sinhalese Sri Lankan population

Authors : Navneet LAL, Jon CORNWALL, George J DİAS

Pages : 205-210

View : 38 | Download : 7

Publication Date : 2016-12-30

Article Type : Research Paper

Abstract :Objectives: An understanding of orbital morphology is relevant to forensic identification, craniofacial surgery, and anthropological analysis. Orbital index insert ignore into journalissuearticles values(OI);, the relationship between the height and width of the orbit, varies between different populations of humans. This study examines modern Sinhalese Sri Lankan skulls to determine normal values for OI and explore how OI may vary with laterality and sex. Methods: Measurements of fifty modern Sinhalese Sri Lankan skulls insert ignore into journalissuearticles values(origin Central Province, Sri Lanka); of known sex insert ignore into journalissuearticles values(34 male and 16 female); were undertaken for orbital height and width insert ignore into journalissuearticles values(bilaterally); using a digital caliper. OI was calculated using a standard formula insert ignore into journalissuearticles values([orbital breadth / orbital height] × 100);. Statistical tests analysing OI and size for both sex and laterality were performed using unpaired and paired 2-tailed t-tests insert ignore into journalissuearticles values(p<0.05);, respectively. Results: Overall mean insert ignore into journalissuearticles values(±standard deviation); OI was 81.29±6.14, with significant differences found between males insert ignore into journalissuearticles values(79.29±5.65); and females insert ignore into journalissuearticles values(84.39±5.59); OI. Left OI was significantly greater than right in both males insert ignore into journalissuearticles values(80.74±5.85 vs. 77.83±5.11); and females insert ignore into journalissuearticles values(85.47±5.70 vs. 83.31±5.39);, indicating OI asymmetry. Individual heights and breadths of the orbits were symmetrical in both males and females. Conclusion: Findings indicate OI asymmetry insert ignore into journalissuearticles values(left larger than right OI); and sexual dimorphism in this population of modern Sinhalese Sri Lankan skulls. Male orbits were microseme insert ignore into journalissuearticles values(OI<83); and female mesoseme insert ignore into journalissuearticles values(OI 83–89);, an unexpected finding as Asian populations supposedly have megaseme insert ignore into journalissuearticles values(OI>89); orbits, therefore challenging previous assumptions on ethnic OI norms.
Keywords : measurement, orbit, orbital index, Sinhalese Sri Lankan

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