Affiliation: | 1. Department of Orthodontics, University of Damascus Dental School, Damascus, Syria;2. Department of mechanical engineering, University of Damascus, Damascus, Syria;1. Department of Orthodontics, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, Tex;2. Department of Orthodontics, School of Dentistry, and Graduate School of Biomedical Sciences, The University of Texas Health Science Center at Houston, Houston, Tex |