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Our knowledge on the bonding mechanisms between the metal and ceramic parts of dental systems is very limited. This work tested the hypothesis that the details of the interface processes can be described in the framework of a chemical diffusion model. The development of interfacial phases was investigated by cross-sectional analytical transmission electron(More)
Hydrogenated multilayers (MLs) of a-Si/a-Ge have been analysed to establish the reasons of H release during annealing that has been seen to bring about structural modifications even up to well-detectable surface degradation. Analyses carried out on single layers of a-Si and a-Ge show that H is released from its bond to the host lattice atom and that it(More)
AIM To develop an in vitro model in which the pressure in the periapical tissues can be measured during loading. METHODOLOGY Extracted human maxillary central incisors were embedded in resin blocks that had physical characteristics similar to those of bone and periodontal ligament. Each tooth was loaded with 20, 40, 50, 60, 75, 85, 100, 200, 300 and 450 N(More)
It is shown, by using depth profiling with a secondary neutral mass spectrometer and structure investigations by XRD and TEM, that at low temperatures, at which the bulk diffusion is frozen, a complete homogenization can take place in the Cu/Au thin film system, which leads to formation of intermetallic phases. Different compounds can be formed depending on(More)
In this investigation we observed the interface between Wiron 99 (Bego) dental Ni-Cr alloy and Vision (Wohlwend AG) ceramic opaquer with SEM. In the system there are intermediate phases coming from a solid phase rection which play an essential role in the metal-ceramic bond. The analytical methods showed that in this phases the content of Ni and Cr charge(More)
Owing to its excellent biocompatibility, titanium has been used in health care, including dental care, for a long time. The unalloyed light metal is a non-allergic one, it resists corrosion, has low heat conducting ability, it tastes neutral and is relatively cheap to apply. Titanium's biocompatibility may be associated with its fast oxidizing capacity,(More)
Alloying by grain boundary diffusion-induced grain boundary migration is investigated by secondary neutral mass spectrometry depth profiling in Ag/Au and Ag/Pd nanocrystalline thin film systems. It is shown that the compositions in zones left behind the moving boundaries can be determined by this technique if the process takes place at low temperatures(More)
The classical Einstein’s relation for the Brownian migration has a mesoscopic character and it deteriorates when e.g. diffusion in solids is considered in the nanoscale (i.e. if the diffusion distance is comparable with the atomic spacing). This behaviour is strongly related to the well-known diffusion paradox, predicting infinitely fast diffusion kinetics(More)
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