Objectives: The aim of this study was to investigate the frictional resistance (FR) and surface topography of newly available

polycrystalline alumina (PCA) ceramic brackets characterised by a yttria-stabilised zirconia (YSZ) coating of the slots, compared

with monocrystalline alumina (MCA) ceramic brackets and stainless steel (SS) brackets.

Methods: The FR was investigated using a universal testing machine. The test groups included PCA (Clarity Advanced, 3M