engleski

Influence of cast surface finishing process on metal-ceramic bond strength

This study investigated the influence of different cast surface finishing process on metal-ceramics bond strength. Materials and methods. Six Co-Cr alloy sample groups were cast (Wirobond C, BEGO, Bremen, Germany) and randomly selected for use in one of the six different final processing of the casting surface (oxidation, sandblasting with 110 and 250 &micro ; ; m Al2O3, bonding agent, hydrochloric acid solution) prior to application of feldspathic ceramic (Duceram Kiss, DeguDent, Hanau-Wolfgang, Germany). The testing was carried out with a tensile testing machine (LRX with Nexygen software, Lloyd Instr., Fareham, UK) (ISO 9693). Results. The highest force (66, 902 N) for the separation of ceramics measured with the sample sandblasted with 250&micro ; ; m Al2O3, oxidised and repeatedly sandblasted with 250 &micro ; ; m, and the lowest force (36, 260 N) with the sample treated with hydrochloric acid solution. With all sample groups except the group with the bonding agent (cohesive fracture), an adhesive fracture of the medium and an adhesive-cohesive fracture of the peripheral part of the fracture surface were observed. The oxidation, prolonged oxidation and the bonding agent do not influence the bond strength of the tested metal-ceramic system. Conclusion. Different casting surface treatments have an important role on the bond strength of the ceramic-metal interface.

casting surface processing; bond strength; metal-ceramic restoration; metal-ceramic interface

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