TY - MANSCPT AU - Attia, Amr Mahmoud AU - Mostafa, Yehya Ahmed AU - El-Beialy,Amr R. AU - Dehis,Heba M. TI - Evaluation of the anchorage loss during en-masse retraction in orthodontic patients with maxillary protrusion using friction versus frictionless mechanics : A randomized clinical trial U1 - 617.643 23 PY - 2022/// KW - Orthodontics N1 - Supervisors Prof. Yehya A. Mostafa, Dr. Amr R. El-beialy, and Dr. Heba M. Dehis; Thesis Submitted to the Faculty of Oral and Dental Medicine Future University in partial fulfillment of the requirements for the Master’s Degree in Orthodontics 2022; Includes bibliographical references UR - http://repository.fue.edu.eg/handle/123456789/6257 ER -