The endoscopically assisted transcrestal sinus floor elevation with platelet-rich fibrin at an immediate implantation of periapical lesion site: A case report

RATIONALE: The traditional maxillary sinus floor elevation has serious postoperative complications and long healing periods, for patients with insufficient residual bone height (RBH). The endoscopic technique improves the blind nature of the sinus floor elevation procedure. Platelet-rich fibrin (PRF) can promote tissue healing and prevent perforation. PATIENT CONCERN: A 25-year-old female with residual roots in the maxillary right second molar visited our hospital for dental implants. DIAGNOSE: CBCT results showed a low-density shadow at the root tip, and the height of the periapical distance from the maxillary sinus floor was less than 1 mm. INTERVENTION: Patient was immediately subjected to implant after root extraction. Two-step sinus floor elevation was performed under endoscopy. A 12 mm-long implant was installed. OUTCOMES: At 10 months after surgery, the hard and soft tissues were stable, and a full-ceramic crown was placed. LESSONS: Immediate implant and endoscope-guided sinus floor elevation through a transcrestal approach by using PRF as the only grafting material is viable in periapical infected sites with a RBH of less than 1 mm.