Effect of Different Concentration of Disinfectant Incorporated on Hardness of Heat Cured Acrylic Denture Base

Background: The removable appliances have played an important role in routine prosthodontics and orthodontics for centuries. When the appliances related diseases occur, several approaches have been suggested to manage the situation. Materials and methods: Forty samples of heat cured acrylic were fabricated, they were divided into four groups according to the quantity of chlorhexidine incorporated with the liquid of acrylic (10 samples per each group), and these groups are: Group1: control group mixing heat cure acrylic only (liquid is monomer only) Group2: mixing 3/4 heat cure acrylic liquid with 1/4 chlorehexidine. Group3: mixing 1/2 heat cure acrylic liquid with 1/2 chlorehexidine. Group4: 1/4 mixing heat cure acrylic liquid with 3/4 chlorehexidine. Results: The results of the present study found that the highest shore D Hardness number was for the control group with no ad- dition of chlorhexidine, while the lowest Shore D Hardness number was for group 4 (1/4 mixing heat cure acrylic liquid with 3/4 chlorehexidine). Conclusion: The results revealed a reduction in hardness with increase in the percentage of chlorhexidine addition to monomer.