Comparative Evaluation of microhardness of type 2 Glass Ionomer Cement (restorative) and Zirconia based GIC - An In-Vitro Study

Abstract

Abstract Aims To evaluate the microhardness of type II glass-ionomer cement (GIC) (restorative) and zirconia based glass –ionomer cement. Materials and Methods Twenty cylindrical samples measuring 5mm (diameter) and 5mm in length were prepared with type II glass-ionomer cement that is restorative (n=10) and zirconia based glass-ionomer-cement (n=10). Finishing and polishing was made with coarse grit to fine grit. Then samples were subjected to Vickers hardness tester by using digital micro hardness tester (Zwick/Roell) under a load of 300 grams for 15 seconds. The data obtained was subjected to statistical analysis and unpaired‘t’ test was used to compare the micro hardness between two groups. Result Zirconia based glass-ionomer cements showed better micro hardness values as compared to that of type II glass-ionomer cement (restorative). Conclusion Better material with increased hardness like zirconia based GIC should be used in today's clinical practice. Further studies should be carried out to check other physical properties of zirconia based GIC. How to cite this article Lokhande P, Shivanna V. Comparative evaluation of micro hardness of type 2 Glass Ionomer cement (restorative) and Zirconia based GIC- An in vitro study. CODS J Dent 2015;7:4-7