It is defined as physiological root end development and formation – (American Association of Endodontists.)
The current terminology is vital pulp therapy and is defined by (Walton and Torabinejad) as a treatment of vital pulp in an immature tooth to permit continued dentin formation and apical closure.
This is achieved by:
Indirect pulp capping
Direct pulp capping
Apical closure pulpotomy
Pulpotomy is defined as the amputation of damaged and inflammed vital pulp from the coronal chamber followed by placement of a medicament over the radicular pulp stumps to stimulate repair, fixation or mummification of the remaining vital radicular pulp.
– Braham & Morris 1985
Pulpotomy is defined as the surgical removal of infected coronal pulp and its objectives are preservation of the radicular pulp vitality and relief of pain.
Apexification is a method to induce development of the root apex of an immature, pulp less tooth by formation of osteocementum or other bone-like tissue. It differs from apexogenesis, the physiologic process of root development.