Abstract: 3D printing resin model is a 3D printer based on the light-curing system exposes and solidifies photosensitive materials on the printing platform layer by layer through exposure and imaging, and finally realizes the 3D printing of photosensitive materials by utilizing the displacement of screw mechanism. Invisible orthodontic orthodontic appliance is formed by pressing the dental film on the 3D printed resin model through the film pressing machine, so the surface state of the 3D printed resin model will be presented on the orthodontic appliance. As dental film is high-gloss transparent plastic, most of the models printed by printers have smooth surfaces. After pressing the film, the orthodontic apparatus of the model has serious reflections and loses its invisible effect. In addition, the inner wall of the orthodontic apparatus is smooth. This paper aims to prepare the 3D printed model which has transverse texture on the surface through digital processing. Thus, the invisible orthodontic appliance has the characteristics of invisible and retentionable, so as to solve the technical problems of reflective wearing and easy falling off.

Key words: 3D printing, resin model, invisible orthodontic appliance, invisibility effect, adhesion