Preparation method of antibacterial coating on inner surface of titanium implant abutment

The invention relates to the technical field of implant surface antibacterial coatings, and discloses a preparation method of a titanium implant abutment inner surface antibacterial coating. Cleaning and deoiling: deoiling and cleaning the inner surface of the implant titanium abutment, and polishing with abrasive paper; step 2; micro-arc oxidation (MAO) treatment is conducted, specifically, the titanium-based table is placed in a silicate electrolyte solution (Na2SiO3, NaOH, sodium citrate and Na2WO4), and three-phase power supply equipment is adopted for constant-voltage micro-arc oxidation under the high voltage of 600V. According to the method, the surface of the implant titanium abutment is treated, the rough and porous structure of the titanium surface is increased, a polydopamine/chitosan (PDA/CTS) antibacterial coating is additionally prepared, and chitosan is adhered to the inner surface of the abutment by utilizing the good adhesion capacity of polydopamine, so that the antibacterial effect is achie