INTRODUCTION: Coronal leakage is considered significant factor for failure of endodontic treatment . To provide endodontic care of highest quality attention should be given to coronal restoration after successful completion of root canal treatment. In an array of retrospective studies significant numbers of cases were reported of apical periodontitis in teeth with unsatisfactory coronal seal as compared to the ones with clinically or radiographically acceptable coronal restoration. Post treatment restorative status and quality & extent of root filling along with preoperative periapical lesion were found to have strong effect on outcome of endodontic treatment.