Fig. 1.
Chamber stapes prosthesis. 1 – chamber, 2 – flexible membrane, 3 – rigid plate as a function of applied field.
Fig. 2.
Measurement of stiffness of the chamber stapes prosthesis membrane. Top left – the AFM system; top right – the scanning unit of the AFM; bottom left – the cantilever; bottom middle – ChSP; bottom right – the cantilever mounted in the holder and the sample placed on the AFM Table 1 – cantilever beam, 2 – tip of the cantilever. A – a ring for attaching the membrane to the chamber, B – the chamber, C – the membrane.
Table 1.
Limits of quantification (LOQ) for the determined elements
| Element | As | Sb | Se | Hg | Cd | Tl |
|---|---|---|---|---|---|---|
| LOQ (μg/kg) | 0.0005 | 0.0008 | 0.03 | 0.04 | 0.0002 | 0.008 |
Fig. 3.
Left – EPR spectrum of polymerized DS3000 recorded at room temperature after the irradiation with a dose of 25 kGy in the Elektronika 10/10 electron accelerator. Right – the propagating and allylic radical in dental resin.
Fig. 4.
EPR spectra of the polymerized DS3000 irradiated in the GC5000 gamma source with a dose of 25 kGy recorded immediately after irradiation and after 24 h.
Fig. 5.
The EPR spectra of the chamber stapes prosthesis irradiated in the Elektronika 10/10 electron accelerator recorded directly, 24 h and 216/144 h after irradiation. Left – the sample irradiated in deionized water. Right – the sample irradiated in vacuum.
Fig. 6.
Relative contributions of the EPR signal intensity for the DS3000 and chamber stapes prosthesis samples after irradiation under different conditions as a function of time. The spectra were recorded at a microwave power of 1 mW. GI, gamma; EB, electron beam; rt, room temperature; vac, vacuum; H2O, deionized water.
Table 2.
Hardness (H) and elastic modulus (E) of the polymerized DS3000 before and after irradiation (25 kGy)
| DS3000 | Hardness, H (MPa), n = 4 | Elastic modulus, E (MPa), n = 4 | ||
|---|---|---|---|---|
| Average value | 1 SD | Average value | 1 SD | |
| Before EB | 84.5 | 3.5 | 8500 | 1800 |
| After EB | 203.0 | 5.0 | 8900 | 400 |
Fig. 7.
Stiffness (average value, before and after irradiation with 25 kGy) of the Silpuran membrane (thickness 50 μm, 100 μm, and 200 μm) attached to the chamber.
Fig. 8.
Ten micro-indentation F-dc curves (thick lines) for the polymerized DS3000 sample after the EB sterilization. The slope lines (thin lines) are added to the unloading curves to visualize the S parameter. Magenta F-dc curves correspond to indentations on a slope or between the flat rasters (magenta diamond). Indentations were made with a trapezoidal loading scheme with maximum force of 5 N.