Comparative Evaluation of the Regenerative Capacity of Two Platelet Concentrates

Evaluation of the Efficacy of Injectable Platelet-Rich Fibrin Versus Platelet-Rich Plasma in the Regeneration of Necrotic Immature Maxillary Anterior Teeth. (A Randomized Clinical Trial)

Injectable platelet-rich fibrin (I-PRF) is a flowable blood concentrate that is entirely natural and allows ease of access and flow within the root canal. It was first developed in 2014 by modifying the centrifugation parameters. I-PRF has great potential in the field of endodontics. At present, it is still in its infancy and needs to be explored with regard to its regenerative efficacy. To the best of our knowledge, this study is the first to clinically and comparatively investigate Platelet-rich plasma (PRP) and I-PRF.

An ideal treatment option for an immature necrotic tooth is the regeneration of pulp-like tissue that is capable of boosting the continuation of normal root development. The use of platelet concentrates for that purpose is a clinically relevant, minimally invasive approach which has a promising potential of reducing the healing period. Among which, the most commonly employed is the Platelet-Rich Plasma that is not entirely natural. It involves the use of non-autologous anticoagulants such as bovine thrombin to maintain the fluid consistency which prevents clot formation and thus impairs wound healing, affects the coagulation process and can also trigger an immune reaction, thereby, suppressing regeneration. PRP offers a short-term release of most of the growth factors unlike the Platelet-Rich Fibrin which allows for a more sustained release. PRF does not require any biochemical handling of blood and is easy to procure but due to the gel-like consistency, its adaptability within the root canal requires excessive removal of root dentin. In addition, the application of recombinant growth factors within the root canal is associated with high cost which hinders its applicability in the common clinical practice. Therefore, a new regenerative technique is required that combines the advantages of both PRP and PRF while overcoming their drawbacks.

A platelet concentrate will be prepared from the patient's own blood in plain plastic tubes, without the use of anticoagulants, and applied immediately within the root canal before coagulation.

A platelet concentrate will be prepared from the patient's own blood in tubes containing anticoagulants to maintain the fluid consistency and applied within the root canal.

A blood sample will be drawn from the patient, centrifuged at 700 rpm for 3 minutes and the upper yellow fluid will be collected by a plastic syringe, avoiding the inclusion of the red blood cells underneath, and will be introduced within the root canal.

A blood sample will be drawn from the patient, centrifuged at 3000 rpm for 10 minutes and the upper yellow fluid will be collected by a plastic syringe, avoiding the inclusion of the red blood cells underneath, and will be introduced within the root canal.

root length will be measured on the preoperative and postoperative radiographs and the percentage increase in length will be calculated

Inclusion Criteria: Patients having necrotic maxillary anterior tooth/teeth due to caries or trauma Radiographic criteria: preoperative radiograph showing incomplete root formation with a wide apical foramen. Positive patient/guardian compliance for participation in the study. Exclusion Criteria: Uncooperative patient Lack of patient commitment to the treatment plan and the follow-up period Mature necrotic anterior teeth due to caries or trauma Vital maxillary anterior teeth with open apices Non-restorable teeth Grossly decayed or fractured teeth that require post and core as final restorations Presence of periodontal pockets Radiographically: presence of external or internal root resorption, fracture lines or cracks

Varela HA, Souza JCM, Nascimento RM, Araujo RF Jr, Vasconcelos RC, Cavalcante RS, Guedes PM, Araujo AA. Injectable platelet rich fibrin: cell content, morphological, and protein characterization. Clin Oral Investig. 2019 Mar;23(3):1309-1318. doi: 10.1007/s00784-018-2555-2. Epub 2018 Jul 12.

Karde PA, Sethi KS, Mahale SA, Khedkar SU, Patil AG, Joshi CP. Comparative evaluation of platelet count and antimicrobial efficacy of injectable platelet-rich fibrin with other platelet concentrates: An in vitro study. J Indian Soc Periodontol. 2017 Mar-Apr;21(2):97-101. doi: 10.4103/jisp.jisp_201_17.

Wang X, Zhang Y, Choukroun J, Ghanaati S, Miron RJ. Effects of an injectable platelet-rich fibrin on osteoblast behavior and bone tissue formation in comparison to platelet-rich plasma. Platelets. 2018 Jan;29(1):48-55. doi: 10.1080/09537104.2017.1293807. Epub 2017 Mar 29.

Miron RJ, Fujioka-Kobayashi M, Hernandez M, Kandalam U, Zhang Y, Ghanaati S, Choukroun J. Injectable platelet rich fibrin (i-PRF): opportunities in regenerative dentistry? Clin Oral Investig. 2017 Nov;21(8):2619-2627. doi: 10.1007/s00784-017-2063-9. Epub 2017 Feb 2.