Objective: The purpose of this study is to measure the dimensions of the slot's top and base of passive self-ligating brackets of three commercial and available systems and to compare the measured dimensions with the manufacturers' published dimensions.
Methods: Digital microscope was used to measure the slot's top and base of 40 Central incisor brackets by three different manufacturers, Carriere SLX (Ortho Organizer, USA), Damon Q (Oramco USA) and Smart Clip (3M Unitek USA). The measurements were taken after the doors of all brackets were removed and compared with the manufacturers' claimed dimensions.