Possible etiologic factors in external root resorption

摘要: The causes of external root resorption have remained an enigma to the dental profession since oral roentgenography was introduced. Numerous investigators implicated various etiologic agents with resorption, and, exception those studies evaluating loss following orthodontic treatment,8s 9, 2x, 32 they are generally inconclusive. Xo causative agent has been noted account for t,vpe called idiopnthic,” ranging from minor blunting apex complete structure. problem is even more perplexing hecausc, in many instances, it difficult determine whether lack apical structure developmental or resorptivr. object this study invcstigatc relationship idiopathic (1) genetic influcnc~cs immediate family, (2) systemic frequently cited literature as causat,ivc, (3) type malocclusion, including examination nonphysiologic (*ontact relat ionships during cxcursive movements, and hypoand hyperfunction normal occlusion dentition, (4) past medical history, antI (5) craluation persons who untlcrwent ortliodontic~ trcat,ment.