Background: Endodontic therapy aims to restore physiological normality to dental elements. Hence; the present study was conducted for assessing the sealing Ability of two Different Restorative Materials Used as Coronal Sealants. Materials & methods: 50 freshly extracted human maxillary first premolar was collected. Access opening was done followed by root canal preparation. Removal of the crowns was done at CEJ. Afterwards, two study groups were formed with 25 tooth specimens in each group as follows: Group A: 4 mm light cure composite resin group, and Group B: 4 mm GIC type II group. Coronal and mid segments of the canals were flared. The canals were dried and obturated. The coronal four mm of the canal over the gutta-percha received the following restorations over gutta-percha obturation. Placement of the roots was done in India ink for 48 h, rinsed with tap water. The maximum point of coronal dye penetration was measured from the CEJ under stereomicroscope. Results: The mean dye penetration assessment showed high value for group B in comparison to Group A. while comparing the results statistically, significant results were obtained. Conclusion: Composite group showed better results in comparison to GIC.