ROOT RESORPTION ¿ Root resorption of the adult permanent dentition is pathological process, of internal or external origin which occurs when the natural protection of the predentine and odontoblasts in the root canal, or the precementum and cementoblasts on the root are damaged or removed¿. A condition associated with either a physiologic or a pathologic process that results in loss of substance from a tissue such as dentin, cementum or alveolar bone American Association of Endodontists 1984