A Cross-Sectional Study To Establish Soft Tissue Cephalometric Norms For Orthognathic Surgery In Kerala Population

Aim: The aim of the investigation is to establish soft tissue cephalometric norms for orthognathic surgery in the population of Kerala and to compare the values obtained with Legan and Burstone soft tissue cephalometric analysis. Materials and methods: Lateral cephalometric radiographs were taken for a total of 100 subjects (50 males and 50 females) of age group 1825 years, selected according to the inclusion criteria. All lateral cephalometric films were traced digitally and Legan and Burstone analysis was done using Nemoceph NX Orthodontic Cephalometric Software (version 6). The values obtained were statistically analyzed using the Statistical Package for Social Sciences (SPSS 16.0) and tabulated. The change in the values of different parameters were compared with the standard values of Legan and Burstone soft tissue analysis. Results: The study revealed almost all the values as statistically significant hence necessitating the importance of this study. The norms are discussed under facial form and lip position.When the values derived for facial form from Kerala population was compared with original Caucasian norms all the values obtained were found to be significant except lower vertical height depth ratio with a highly significant difference for vertical height ratio and lower facethroat angle. When the lip position and form was compared with the Caucasian norms, all the values were significant except the vertical lipchin ratio with highly significant values for the upper lip protrusion, lower lip protrusion, mentolabial sulcus, maxillary incisor exposure and inter labial gap. Thus a different set of soft tissue cephalometric norms was necessary for Kerala population which can aid the clinicians for diagnosis and treatment planning and the present study has formed a norm which could be used for future reference for patients undergoing orthognathic surgery. European Journal of Molecular & Clinical Medicine ISSN 2515-8260 Volume 08, Issue 01, 2021 864 864 Conclusion: COGS (Cephalometrics for Orthognathic surgery) can be used as the cephalometric norms for orthognathic surgery across the world in order to know the variation from normal and to bring these values to normal or near normal by orthognathic