Talib, Mays A, et al. “The Effect of Titanium Dioxide Nanoparticles on the Activity of Salivary Peroxidase in Periodontitis Patients”. Journal of Baghdad College of Dentistry, vol. 35, no. 2, June 2023, pp. 10-19, https://doi.org/10.26477/jbcd.v35i2.3393.