Aim: The present study aims to compare advanced platelet-rich fibrin (A-PRF) and conventional blood clot as scaffolds in the regenerative endodontic procedure (REP) and to evaluate their effectiveness in the development of traumatized nonvital immature teeth roots.
Material and methods: Regenerative endodontic procedure was carried out on 20 traumatized nonvital immature maxillary incisors of 17 patients between the ages of 8 and 12 years. Irrigation with 1.5% sodium hypochlorite (NaOCl) and 17% ethylene diamine tetra-acetic acid was done following minimal mechanical debridement. Canal disinfection was achieved using calcium hydroxide paste. According to the scaffold type, teeth were randomly allocated into A-PRF (n = 10) and conventional blood-clot groups (n = 10). Apical width and root dimensions (length and thickness) were analyzed radiographically and statistically after 3-, 6-, and 12-month follow-up.
Results: Fifteen patients with 18 teeth (A-PRF n = 9, blood clot n = 9) completed the follow-up, and 2 patients were excluded. Patients in both groups were asymptomatic. There was a significant increase within each group in respect to root length, root thickness at one- and two-thirds, and root apex width for all timepoints. While percent of change between the two groups was statistically insignificant.
Conclusion: Regenerative endodontic procedure for traumatized immature nonvital teeth with either conventional blood clot or A-PRF as scaffold was comparable, except in cases where adequate bleeding cannot be achieved.
Clinical significance: Advanced platelet-rich fibrin provides a suitable scaffold that can be used in REP of teeth with close proximity to vital structures such as inferior alveolar nerve (IAN) or mental nerve, where using a sharp instrument to induce bleeding can cause damage and also in cases where adequate bleeding cannot be achieved.
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