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Beagle FI model establishment. (A) Modeling procedures: a. flap elevation, b. establishment of the “U”-shaped defect and stainless-steel ligature fastening, c. LIPUS treatment, and d. ultrasonic therapeutic device. (B) Postoperative radiographic observation. (C) Clinical assessment of BI, PD, and AL before and after the modeling procedure. Data are presented as mean ± SD. *p < 0.05. (D) SEM image of the PTFE membrane.
