Inherent defects seen in the morphology of polycrystalline ceramic brackets severely limit their fracture strength. Only by improving the surface characteristics can those mechanical properties which are necessary for sufficient strength and efficient orthodontic tooth movement be more fully realized.
Robert Kusy is Associate Professor of Orthodontics / Biomedical Engineering at the University of North Carolina, Dental Research Center in Chapel Hill. He holds an M.S. degree in Metallurgical Engineering and a Ph.D. in Materials Science from Drexel University