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Aim: To determine the site and pattern of deep carious lesion & its consequences on coronal and radicular structures radiographically in primary molars & first permanent molars using IOPA radiographs. Materials and methods: It consisted of 200 IOPA of Deep carious of Maxillary & mandibular of primary (n=100) and permanent molars(n=100) X-rays are collected. IOPA radiographs of Deep carious lesion involving only dentin with radiolucency reaching the inner 1/3 of dentin, clinically cavitated that is RC5 Of the ICMMS criteria were taken. Blinded Radiographic evaluation was done by two persons to rule out inter examiner variability. Results: In primary molars IOPA there was statistically significant difference in Carious adjacent tooth whereas in permanent molars IOPA there was statistical difference in Diffused pattern and lost tooth structures. When compared primary and permanent molars diffused pattern and lost tooth structure showed statistically significant difference. Conclusion: The deep carious lesions definitely lead to loss of crown structure over a period of time and also capable of spread of caries to adjacent teeth due to food impaction & inadequate oral hygiene. Hence leading to loss of function and arch length.