A 6-year-old girl was brought to the dentist for completing the treatment of the 75 tooth for chronic granulating periodontitis. The patient has no complaints. Objectively: occlusive dressing on the 75 tooth remains intact, percussion is painless, mucous membrane in the region of the 75 tooth exhibits no pathological changes, is painless on palpation. What material is the most appropriate for the root canal filling in this case?