3 However, an average of 1.12 mm has also been reported, with a few cases presenting with more than 2.5 mm of resorption. The average degree of root resorption in each maxillary anterior tooth is less than 1.5 mm during corrective orthodontic treatment. ![]() 1 Genetic and local factors directly related to orthodontic movement can cause EARR these include the degree and direction of forces and the treatment duration. During tooth movement, the concentration of forces on the periodontium, particularly on the apical third, can destabilize local homeostasis, resulting in loss of the surface layer of cells that protect the roots of the teeth. ![]() External apical root resorption (EARR) is a complication of orthodontic treatment that results in irreversible loss of root structure.
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