Comparative Evaluation of the Influence of Cast Hardening Agents on Surface Abrasion, Surface Hardness and Surface Detail Reproduction Properties of Refractory Investment Materials
Saji P1, Raza Mohamed1, Noufal P. K2, P. Sesha Reddy3, Ashish R. Jain4 and Revathy Gounder4

1Department of Prosthodontics, Pariyaram Dental College, Pariyaram, Kannur, Kerela, India.

2Department of Prosthodontics, Al Azhar Dental College, Perumpillichira, Thodupuzha, Kerela,  India.

3Department of Prosthodontics, Goverment Dental College, RIMS, Putlampali, Kadapa, India.

4Department of Prosthodontics, Saveetha Dental College and Hospitals,Chennai, India.

Corresponding Author E-mail: dr.ashishjain_r@yahoo.com

Abstract: 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.

Keywords: Surface roughness; Surface hardness; Surface details; Refractory Investment

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