A 12-year-old boy is in the dental office to complete treatment of the 36th tooth chronic periodontitis exacerbation. There are no complaints. Objectively: occlusive dressing of the 36th tooth is intact; tooth percussion is painless; there are no pathologies of the mucosa surrounding the 36th; mucosa palpation is painless. What material is the most advisable for root canal filling in this case?