The portion of the dental papilla located at the apex of the root of developing permanent tooth that is responsible for the progressive elongation and maturation of the root tooth. [ http://www.ncbi.nlm.nih.gov/pubmed/34026757 http://www.ncbi.nlm.nih.gov/pubmed/18498881 ]
Synonyms: apical papilla apical papilla of immature permanent teeth
Term information
The surface layer is formed by a dense collagen matrix with perpendicular aligned collagen fibers. The inner layer consists of a loosely disorganized collagen matrix with a high concentration of mesenchymal stem cells. Fully mature roots lack apical papilla.