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Durable adhesion between resin composite cement and Ti prostheses is critical for a long clinical life in dentistry. A rough surface is a prerequisite for mechanical interlocking and a special coating method, silica-coating must be followed by silanation for chemical adhesion. Commercially pure grade-2 Ti specimens were modified by silica-coating and silanized with an experimental silane blend primer or two commercially available silane primers. Specimens were assigned randomly: Group-A (control; polished only Ti), Group-B (polished Ti + silica-coating + primers), Group-C (polished Ti + etching with HNO₃ + with or without primers), Group-D (polished Ti + silica-coating + etching with HNO₃ + with or without primers), Group-E (polished Ti + etching with HCl+H₃PO₄ + with or without primers), and Group-F (polished Ti + silica-coating + etching with HCl+H₃PO₄ + with or without primers). Next, Ti specimens were …