Healing of Mandibular Third Molar Extraction Sockets Using Platelet Concentrates and Photobiomodulation

Surgical extraction of impacted mandibular third molars frequently results in postoperative complications such as pain, edema, trismus, and delayed bone regeneration. Advances in regenerative medicine have introduced autologous platelet concentrates, including advanced platelet-rich fibrin (A-PRF+) and concentrated growth factors (CGF), which provide sustained release of growth factors that may enhance soft and hard tissue healing. Additionally, photobiomodulation using low-level laser therapy has been reported to reduce inflammation and stimulate tissue regeneration. This single-center, randomized, single-blind clinical trial was conducted to evaluate the effectiveness of A-PRF+, CGF, and photobiomodulation, applied alone or in combination, in enhancing postoperative healing following mandibular third molar extraction. A total of 122 generally healthy adult participants requiring surgical extraction of a partially or fully impacted mandibular third molar were enrolled. Participants were randomly allocated to one of six parallel study groups: standard extraction with primary wound closure (control), extraction with photobiomodulation, extraction with socket augmentation using A-PRF+, extraction with socket augmentation using CGF, extraction with A-PRF+ combined with photobiomodulation, or extraction with CGF combined with photobiomodulation. All surgical procedures were performed under standardized clinical conditions. Primary wound closure was attempted in all cases. Photobiomodulation was performed using a diode laser with a wavelength of 635 nm, power output of 100 mW, and energy density of 4 J/cm², applied at four points around the extraction socket. Autologous platelet concentrates were prepared from the patient's peripheral blood using standardized centrifugation protocols. Clinical outcomes, including postoperative pain assessed using a visual analogue scale, facial swelling, mouth opening, and early wound healing, were evaluated at 1, 3, and 7 days after surgery. Radiological assessment of bone regeneration within the extraction socket was performed 3 to 4 months postoperatively using cone-beam computed tomography-based fractal dimension analysis. The study was conducted in accordance with the Declaration of Helsinki and Good Clinical Practice guidelines. All participants provided written informed consent prior to enrollment. The findings of this study aim to contribute to the optimization of postoperative management following mandibular third molar extraction by identifying effective regenerative treatment strategies.