Patent ID: 7479009

Claim:
An orthodontic bracket base comprising: an adhesion surface, having edges, to be brought into close contact with a tooth surface; a central projection having a circular column-shaped configuration with a diameter of 1.0˜1.5 mm and height of 0.2˜0.3 mm, being located at a center portion of the adhesion surface, and being made of stainless steel or other material having the same force of adhesion as stainless steel; a plurality of surrounding projections, each of which having a square column-shaped configuration with a height of 0.2˜0.3 mm and having a smaller area of contact with the tooth surface than the central projection, being arranged in diagonal directions with regular intervals around the central projection, and being made of resin, ceramic or mixture thereof; and a pair of separation elements oppositely formed on the edges of the adhesion surface and project outside the adhesion surface, each of which having a smaller area of contact with the tooth surface than any of the surrounding projections, and having a width that gradually decreases as it extends away from the edge of the adhesion surface.