title: Factorial trial.
authors: Nikolaos
authors: N
authors: Pandis
mesh_terms: D000465:Algorithms; D018865:Dental Research / Q000706:statistics & numerical data*; D005163:Factor Analysis, Statistical; D006801:Humans; D016910:Orthodontic Brackets / Q000706:statistics & numerical data; D009969:Orthodontic Wires / Q000706:statistics & numerical data; D009970:Orthodontics / Q000706:statistics & numerical data*; D012107:Research Design / Q000706:statistics & numerical data*