inflammatory stimulation or as the result of pressure exerted by developing neoplasms or cysts. b. Normal Resorption. The roots of deciduous teeth are resorbed just before the eruption of the permanent teeth. There is also normal resorption of bone in edentulous areas where permanent teeth have been extracted. Healthy bone is constantly being remodeled. Resorption and deposition of bone is the basis for the treatment applied by the orthodontist who moves malposed teeth slowly into proper position. Resorption is also important in the repair of a fracture and the healing of a tooth socket. c. Abnormal Resorption. There are other types of resorption that may not be considered normal. Resorption of the roots of permanent teeth may be the result of many factors involving disease and trauma. For example, systemic (endocrine) disturbances and some neoplasms are characterized by bone and root resorption. Impacted teeth may impose upon the roots of other teeth to cause areas of resorption.