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(a and b) Preoperative sagittal and coronal cross-sections of 16 tooth show chronic apical periodontitis coexisting with maxillary sinusitis of endodontic origin with periapical osteoperiostitis and periapical mucositis signs; (c and d) 8-month control cone-beam computed tomography systems shows complete resolution of sinusitis symptoms and healing of periapical bone.
