ASSOCIATION BETWEEN FIRST CERVICAL VERTEBRA MORPHOLOGY AND MANDIBULAR SYMPHYSIS MORPHOLOGY IN DIFFERENT GROWTH PATTERN ASSESSED BY LATERAL CEPHALOGRAM AND 3d CT SCAN IN INDIAN POPULATION – CROSS SECTIONAL ANALYTICAL STUDY.

Introduction: This study was performed to evaluate association between rst cervical vertebra morphology and symphysis menti morphology in different growth patterns. Method: The sample of study included 240 lateral cephalograms, which were collected from department of Orthodontic and Dentofacial Orthopaedics. The lateral cephalograms were traced, by using Nemoceph software. Depending on this measurement samples were divided into average, horizontal and vertical growth patterns. Tracing was done for all of these cephalometric lms, 3 linear measurements for the atlas and symphysis menti and 1 angular measurements of symphysis menti. These measurements were done by using computer software SPSS version 26. Result: The results showed that there was no signicant difference in rst cervical vertebra parameters but symphysis menti angle and depth had signicant difference in horizontal growth pattern. Conclusion: It is concluded that in average growth pattern, there is increase in length of cervical vertebra with decient chin and in horizontal growth pattern, there is decrease in length of cervical vertebra with more prominent chin having more depth than in vertical growth pattern. There is no correlation between cervical vertebra morphology and mandibular growth rotation but in horizontal growth pattern, there is more prominent chin than with vertical and average growth patter