UDC 616.314/.716.1-001-085:616.15 

 Restoring the connection between the tooth and the periodontium is the primary goal of complex treatment, which involves the formation of new bone and cement, restoring the periodontal ligament and blood supply to the pulp from the surrounding tissues. The study aimed to investigate the effect of platelet-rich plasma as a medium for temporarily storing a dislocated tooth on the regeneration and reconstruction of its tissues after replantation of an extracted tooth compared to saline and water. In this study, 30 adult male Wistar rats were used, and a tooth was extracted and then replanted. A fibroblast cell activity analysis was performed after 72 hours to determine cell viability. Cells incubated in platelet-rich plasma medium had a higher percentage of cell viability (82.7±5.1), followed by saline (74.3±4.2) with statistical significance (p>0.001). The minimum percentage was recorded in cells in the medium with tap water (68.8±3.9). The pulp, dentin and cementum of the group where the teeth were placed in platelet-rich plasma showed normal histological features, demonstrating optimal tissue remodelling and attachment to the surrounding bone. There were no signs of root resorption. In summary, this study used several temporary storage procedures and evaluated changes in histological events that occurred during the storage of extracted teeth and replantation until the time of recording of the success of the replantation. The study's results indicate the use of platelet-rich plasma as a storage medium, as it significantly preserves the viability of dental cells compared to water and saline solutions.

Key words: teeth dislocations, tooth replantation, permanent teeth, platelet-rich plasma, traumatic injuries of the maxillofacial area.