Porcelain bonding on Ti: Its dependence on surface roughness, firing time and vacuum level

Abstract

Abstract Adherence of porcelain on titanium and possible bonding mechanisms were studied. The main variables were surface roughness. The bond strength for Al 2 O 3 ‐blasted rough surfaces was superior to those ground by SiC paper or polished. The fracture was partly cohesive for the Al 2 O 3 ‐blasted surfaces as a result of mechanical interlocking. For smoother surfaces fracture occurred adhesively. Increased firing time and reduced vacuum level decreased the bond strength when mechanical interlocking was weak. This was most likely related to poor adherence of the interfacial oxide layer to the titanium substrate.