TY - JOUR AU - Krieger, E; Drechsler, T; Schmidtmann, I TI - Apical root resorption during orthodontic treatment with aligners? A retrospective radiometric study JO - Head Face Med PY - 2013 DO - 10.1186/1746-160X-9-21 L3 - PubMed-ID: 23941626 N1 - et al. ER -