Define the Requirements of Root-End Filling Materials
1. Seal well
2. Well tolerated by periapical tissues "Biocompatible" << most imp. Criteria.
3. Easily inserted "manipulated"
4. Unresorbable
5. Resistant to moisture "insoluble in tissue fluids"
6. Radiographically visible "radiopaque"
7. Stimulate regeneration
8. Have a good adaptive capability
9. Non-porous
10. Bacteriostatic
11. Not discolor tooth structure
12. Easily removed if necessary
13. Sterile
14. Dimensionally stable
15. Non-carcinogenic, non-irritating to periapical tissues