Patent ID: 8277577

Claim:
A method for obtaining a treated surface of a titanium-based metal implant intended to be inserted into bone tissue, comprising: (a) projecting particles of aluminium oxide under pressure on an external area of the implant to form a sandblasted external area; (b) cleaning the sandblasted external area with a pressurized air, to provide a cleaned sandblasted external area; (c) chemically treating the cleaned sandblasted external area of the implant with an acid composition comprising sulfuric acid and hydrofluoric acid to form a sandblasted and chemically treated external area; and (d) thermally treating the sandblasted and chemically treated external area of the implant by heating at a temperature of 200-450° C. for 15-120 minutes to form a titanium oxide surface coating layer; wherein the acid treatment step, step (c) results in additional pitting of the cleaned, sandblasted external area.