This document summarizes a study on regenerative endodontic procedures using different scaffold materials. It provides background on regenerative endodontics and recommendations. The study compared the outcomes of using blood clots, platelet-rich fibrin (PRF), collagen, and poly-lactic-co-glycolic acid (PLGA) polymer as scaffolds in 16 immature teeth with necrotic pulps. Results found that PRF and collagen scaffolds showed better periapical healing, apical closure, root lengthening and dentin wall thickening compared to blood clots and PLGA. The conclusion is that PRF and collagen are better scaffolds than blood clots or PLGA for regenerative procedures in immature necro