From the mid-1980s,PIM process had been used to produce dental brackets. Not until the early-1970s,was the stainless steel dental bracket formed by welding. PIM tray in small size and new material binder allowed dental brackets could be clung to each teeth individually. 316L and 17-4PH are frequently-used materials in stainless steel,non-nickle material starts a trend of using austenitic stainless steel. …