What is a typical finishing step required for zirconia restorations prior to veneering when required by the manufacturer?

What is a typical finishing step required for zirconia restorations prior to veneering when required by the manufacturer?

• A. Roughen or sandblast the surface.
• B. Apply glazing only.
• C. Do not alter the surface.
• D. Immerse in acid.

Answer: (A)

Zirconia cores rely on mechanical interlocking with the veneer porcelain, so creating surface roughness on the core before veneering is essential. Roughening the internal surface—typically by controlled sandblasting with aluminum oxide—adds micromechanical retentive features that the veneer porcelain can grip onto, improving bond strength. Glazing the core alone won’t provide that texture, and zirconia isn’t etched effectively by acids like silica-based ceramics, so immersing in acid isn’t appropriate. After roughening, the surface is cleaned and then the veneer is applied per the manufacturer’s directions, ensuring a strong bond between core and veneer.

Zirconia cores rely on mechanical interlocking with the veneer porcelain, so creating surface roughness on the core before veneering is essential. Roughening the internal surface—typically by controlled sandblasting with aluminum oxide—adds micromechanical retentive features that the veneer porcelain can grip onto, improving bond strength. Glazing the core alone won’t provide that texture, and zirconia isn’t etched effectively by acids like silica-based ceramics, so immersing in acid isn’t appropriate. After roughening, the surface is cleaned and then the veneer is applied per the manufacturer’s directions, ensuring a strong bond between core and veneer.