eng Oriental Scientific Publishing Company Biomedical and Pharmacology Journal 0974-6242 2017-09-25 10 3 1517 1524 10.13005/bpj/1261 16138 article Saji P. 1 Raza Mohamed 1 Noufal P. K. 2 P. Sesha Reddy 3 Ashish R. Jain 4 Revathy Gounder 4 Department of Prosthodontics, Pariyaram Dental College, Pariyaram, Kannur, Kerela, India. Department of Prosthodontics, Al Azhar Dental College, Perumpillichira, Thodupuzha, Kerela, India. Department of Prosthodontics, Goverment Dental College, RIMS, Putlampali, Kadapa, India. Department of Prosthodontics, Saveetha Dental College and Hospitals,Chennai, India. To evaluate and compare the effectiveness of Dental Cast Hardening Agents on the Surface Abrasion, Surface Hardness and Surface Detail reproduction of Dental Refractory investment materials. This study utilised two commercially available refractory materials:  RemaexaktDentaurum (Germany), X20 chrome investment whip mix corporation (U.S.A). The samples were divided into four groups: Group  I- Untreated samples, Group  II- Samples treated with paraffin wax, Group  III- Samples treated with bees wax, Group IV- Samples treated with okodur cold hardener. Surface abrasion test was done by electrically operated abrading tool, surface hardness by Mohs’ scale, surface details with Galai scan array 2 image system. Mean difference were statistically analysed using students t test. For Surface abrasion test, all groups showed statistically significant difference (<0.01) except Group 2 samples of X20 chrome refractory investment material compared with Group 3 and 4 (>0.05). Mohs’ Scale value for the Group 4 samples were the hardest with a value of five. Results of the surface reproducibility showed that both untreated and treated samples showed a reduced width of the groove, when compared with the steel model. Results of test for surface abrasion and surface hardness indicated that hardening agents do improve the surface abrasion resistance and abrasion values of treated samples. https://biomedpharmajournal.org/vol10no3/comparative-evaluation-of-the-influence-of-cast-hardening-agents-on-surface-abrasion-surface-hardness-and-surface-detail-reproduction-properties-of-refractory-investment-materials/ Surface roughness Surface hardness Surface details Refractory Investment