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Aim: The aim of this study is to assess variations in the intercommissural width between the population of North Indian and south Indian origins in chennai. Background: Intercommissural width is a reliable guide  to aid in dental procedures within different ethnicities.There was a  paucity of literature related to comparison of intercommissural distance between different ethnicities in the population studied.  Materials and Methods:A cross-sectional study was conducted among 150 students of Saveetha Dental college and Hospitals of different cultural backgrounds. Data tabulation and Statistical analysis was performed in Statistical Package for the Social Sciences (SPSS) software version 23.0 (IBM, Chicago, USA). Independent ‘t’ test was performed to assess the mean width of the samples and pearson chi-square test was done to find the correlation between the mean width of North indian and south Indian populations. Results: The North Indian Population had more Intercommissural width (Mean= 47.79) compared to the South indian Population (Mean= 47.38), although the difference  was not statistically significant (p= 0.648).Conclusion: Within the limits of this study, the North Indian population had more intercommissural width than the South indian population. The intercommissural width measurement is not an accurate measure to differentiate between ethnicities.

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