A MODIFIED VITAL AND NON VITAL ROOT SUB MERGENCE CONCEPT FOR OVER DENTURES; A CASE REPORT - Agrawal, Dr. Rajlaxmi; Tanwani, Dr. Tushar; Das, Dr. Partha Pratim; Chanda, Dr. Ankita; Vyas, Dr. Shruti (International Journal of Advance Research and Innovative Ideas In Education, 2021)