IADR Abstract Archives

Porcelain fused-to-cast/milled and SLM Co-Cralloys: The effect of a bonder

Objectives : Recently, bonding agents have been introduced to block the escape oxides formed on Co-Cr alloy surfaces during porcelain veneering. The aim of the present study was to investigate the effect of a bonding agent on the interfacial morphology and elemental distribution of porcelain fused to Co-Cr dental alloys fabricated by casting, milling and selective laser melting (SLM).

Methods : Three groups of Co-Cr dental alloy specimens (VI-COMP/Dentsply, Elephant Dental, Okta-C/Sae Dental Products Inc. and ST2725G/SINT-TECH n:4) were prepared employing casting, milling and SLM and were then veneered with a dental porcelain (GC Initial MC, GC). In two specimens per group a bonding agent (GC Initial INmetalbonder) was applied prior to porcelain veneering. After metallographic preparation the metal-ceramic interfaces were examined by SEM/EDX (BE imaging and line scan elemental analysis across the interface).

Results : BE imaging revealed continuous interfaces in all specimens. Line scan analysis showed a Cr-rich zone at the interface of alloys directly veneered with porcelain. Such a zone was missing from the alloys treated with the bonding agent. This finding may be explained by the higher chemical affinity of O with elements of the bonding agent (i.e. Ti).

Conclusion : All interfaces tested were continuous. The use of the bonding-agent reduced the interfacial Cr content. This may influence the interfacial concentration of the adherent metal oxides and consequently the metal-ceramic bond strength.

Continental European Division Meeting
2013 Continental European Division Meeting (Florence, Italy)
Florence, Italy
2013
409
Scientific Groups
  • Zinelis, Spiros  ( School of Dentistry, University of Athens, Athens, N/A, Greece )
  • Al Jabbari, Youssef  ( College of Dentistry, King Saud University, Riyadh, N/A, Saudi Arabia )
  • Koutsoukis, Theodoros  ( College of Dentistry, King Saud University, Riyadh, N/A, Saudi Arabia )
  • Barbagadaki, Xanthippi  ( School of Dentistry, University of Athens, Athens, N/A, Greece )
  • Eliades, George  ( School of Dentistry, University of Athens, Athens, N/A, Greece )
    • Oral Session
    Dental Materials VII - Technologies
    09/06/2013