Objective: This study aimed to evaluate the influence of incorporation of silver nano-particles (Ag-NPs) and Henna on colour changes, flexural modulus, and toughness of the heat-polymerized polymethyl methacrylate denture base material.
Materials and Methods: A total of 60 conventional heat-polymerized PMMA acrylic resin samples were fabricated with a conventional compression-moulded technique and used in this study. Modified acrylic resin samples were prepared by addition of Ag-NPs (0.5 wt.%), and Henna fillers (1wt.%), to the powder of PMMA resin. For colour change evaluation, a total of thirty disc (20x3mm) samples (n=10 samples for each type of acrylic resin) were used. While for the transverse strength test, a total of 30 acrylic samples (65×10×3 mm) ( n=10 samples for each type of acrylic resin) . The dimensions of samples were selected according to the American Dental Association (ADA) specifications #12.
Results: The incorporation of Ag-NPs and Henna fillers resulted in significant colour changes in PMMA acrylic resin. At the same time, both added fillers resulted in a significant decrease in the flexural modulus and toughness of the PMMA acrylic resin.
Conclusion: Incorporating Ag-NPs and Henna fillers adversely affect the colour of the PMMA and its flexural modulus and toughness.