Method for coating dental implant

A method for coating a surface of a dental implant using parylene, comprising:

• pretreating the dental implant;
• and
• coating a surface of the pretreated dental implant with a coating material to form a polymer coating layer,
• wherein the coating comprises vaporizing a cyclic para-xylylene dimer, pyrolyzing the vaporized cyclic para-xylylene dimer to form a para-xylylene monomer, synthesizing the pyrolyzed para-xylylene monomer to the parylene and depositing the parylene on the dental implant, thereby forming the polymer coating layer,
• wherein the synthesizing comprises adding a citric acid into the pyrolyzed para-xylylene monomer,
• wherein the dental implant comprises a fixture, an upper structure coupled to an upper portion of the fixture, a screw to fix the fixture and the upper structure and a crown coupled to the upper structure,
• wherein only a surface of the upper structure and the screw are coated in order to inhibit a growth of anaerobic bacteria in a portion where at least two of the fixture, the upper structure, the screw and the crown are joined, and
• wherein a thickness of the polymer coating layer ranges from 100 nm˜50 μm.