Othman, D.A., Saleh, .Z.A. and Salman, R.F. 2022. The use of Platelet Rich Plasmain combination of guided tissue regeneration (chitosan) for bone defects: homogeneity analysis. Erbil Dental Journal (EDJ). 5, 2 (Dec. 2022), 133–139. DOI:https://doi.org/10.15218/edj.2022.18.