
Aim: To study the effect of gum arabic and calcium hydroxide on surface hardness of type III dental stone. Materials and Methods: A metal die with 10mm diameter and 12 mm height was fabricated. Type III dental stone was mixed with additives and one without additives. Vickers hardness was measured for specimens. Data was subjected to statistical analysis. Results: The Vickers Hardness for type III dental stone with additives was significantly higher (p<0.001) compared that without additives. Conclusion: Surface hardness can be significantly increased by additives i.e. gum Arabic and calcium hydroxide.