Fractal analysis of peri-implant trabecular bone complexity following transcrestal sinus floor elevation: a retrospective radiographic study - Irfan Ustundag; Sevval Ilkyaz; Numan Dedeoglu; Selman Bolukbasi; Mehmet Sait Simsek; Yunus Çetiner; Bahadir Sancar (Frontiers in Medicine, 2026)