this invention relates to rapid prototyping systems , specifically , a continuous moving surface liquid resin system and fast printing method for making any 3d objects , such as dental devices , including but not limited to artificial teeth , dentures , orthodontic appliances , aligners , splints , veneers , inlays , onlays , copings , frame patterns , crowns and bridges and the like . 3d printers , such as dlp or stereolithography printer , are used to cure polymerizable material in a layer - by - layer manner to build - up the object rapidly and continuously .