THE EFFECT OF POSTPOURING TIME ON TENSILE STRENGTH, SURFACE ROUGHNESS AND COMPRESSIVE STRENGTH OF TYPE IV DENTAL STONE: AN IN VITRO STUDY, Dr Niveditha S Prasad, Dr Nivea T Francis, Dr Sheejith M, Dr Ranjith M, INTERNATIONAL JOURNAL OF PURE MEDICAL RESEARCH : Volume-8 | Issue-5 | May-2023