Effect of the abrasive blasting treatment on the quality of the pressed ceramics joint for a metal foundation

Purpose: Despite the increasing number of new advanced materials and constructions in prosthetics, ceramic crown and bridges with a metal foundation are still popular among patients. Facing ceramics can be applied on the metal foundation by the pressing or firing method. One of the more frequent damages is the chipping of the facing ceramics from the metal foundation. In order to improve the quality of the joint between the metal foundation and the facing ceramics, the metal surfaces usually undergo abrasive blasting treatment with the use of different treatment parameters, such as the working pressure and the grain size of the abrasive material. Design/methodology/approach: The study presents the research of the effect of the working pressure during pressing on the quality of the metal-pressed ceramics joint. The selection of the abrasive blasting parameters was made based on the earlier studies of the strength of ceramics fired on metal. For the treatment, 110 μm grain and 0,2; 0,4; 0,6 Mpa pressures were applied. After the ceramics pressing process, the samples underwent shear strength tests. Findings: The obtained results were much lower than in the case of a similar joint but with fired ceramics, and they did not meet the requirements of the respective standards. The applied treatment pressures did not affect the strength of the joint. Such results can be explained by the fact that the metal foundation exhibited insufficient roughness after the treatment. While, in the case of the fired ceramics, the gains size 110 μm was optimal, in the case of the pressed ceramics, of a higher viscosity, the ceramics flow did not sufficiently fill the surface irregularities, which caused a lower joint strength. Originality/value: This results from the fact that the surface treatment parameters used before the ceramics firing process cannot be directly transferred to the case of the pressed ceramics.

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Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)