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Purpose: This study investigated the effect of incorporating myrrh (Commiphora molmol) to Glass ionomer cement (GIC) on its physical and antibacterial properties. Materials and Methods: Myrrh powder was incorporated into the powder component of Riva GIC (SC; SDI Ltd., Bayswater, Australia) at 1, 2 and 5% (w/w). Unblended powder was used as control. Modified GIC powder was characterized using Fourier transform infrared (FTIR). Compressive strength and young’s modulus were evaluated using a Universal Testing machine. Surface microhardness was measured using Vickers microhardness tester. Solubility was calculated by means of weighing the specimens before and after immersion and desiccation. The antibacterial activity was assessed using agar diffusion method against Bacillus subtilis, Escherichia Coli and Staphylococcus aureus. Data were analyzed by ANOVA and Tukey’s tests (p <0.05). Results: Incorporation of 1, 2 and 5% (w/w) myrrh to GIC did not affect its mechanical properties significantly (P≥0.05). On the other hand, there was a corresponding significant increase in the solubility and antibacterial activity of glass ionomer cement with the highest value against staphylococcus aureus in comparison to that of the control group (P<0.05). Conclusion: Modification of GIC with low concentration of myrrh seems to produce a promising restorative material with antibacterial properties without adversely affecting its mechanical properties. This novel experimental GIC may be potentially useful for a variety of clinical applications. KeywoRds: Glass ionomer cement; Myrrh; Compressive strength; Hardness; Young’s modulus; Solubility; Antibacterial. (1484) Reham M. Abdallah, et al. E.D.J. Vol. 62, No. 2

MYRRH ADDITION TO A CONVENTIONAL GLASS-IONOMER CEMENT: INFLUENCE ON PHYSICAL AND ANTIBACTERIAL PROPERTIES