Effect of Injectable Platelet Rich Fibrin Augmented With Vitamin C Compared to Injectable Platelet Rich Fibrin Alone on Healing of Necrotic Mature Single Rooted Teeth With Chronic Peri-apical Periodontitis Following Regenerative Endodontics (A Randomized Controlled Trial)

According to the amount of the injectable platelet rich fibrin that will be obtained after the centrifugation of blood, the amount of Vitamin C will be calculated to be; for each 1 ml of injectable platelet rich fibrin, 250 μg of Vitamin C will be mixed with the i-PRF and injected inside the canals using a plastic syringe with a 25-gauge needle that was placed 1mm short of the working length and will be withdrawn gradually while injecting till reaching the canal orifice