Research and EducationEffect of 1.5-T and 3.0-T magnetic resonance imaging on the ceramic adhesion and physical properties of prosthetic substructures
Section snippets
Material and methods
The main groups and materials used in the present study are listed in Table 1. Three hundred disk specimens (r=12 mm, h=1 mm) were prepared for 15 experimental groups (n=20) to analyze the shear bond strength (SBS). Additionally, 255 rectangular specimens (4×2×2 mm) were prepared for 15 experimental groups (n=15) to analyze nanostructure. The specimens in this group were produced in a size suitable for the small-angle X-ray scattering (SAXS) device.
To produce casting disk specimens in a
Results
The results of the 1-way ANOVA test for estimating the effect of 1.5-T and 3.0-T MRI application on the SBS, Ra, and Vh of the experimental groups are summarized in Table 3. The descriptive statistics and mean values of SBS, Ra, and Vh are shown in Table 4.
According to the Tukey HSD test results (Table 4), the SBS of the Co-Cr_Ca and Ni-Cr_Cb groups increased and that of the Co-Cr_Cb and Ni-Cr_Ca groups decreased significantly compared with their control groups (P<.001). Additionally, the
Discussion
Based on the findings, the null hypothesis that the physical properties of the materials and metal-ceramic bond would not be affected by exposure to the magnetic field and nonionized radiofrequency waves of MRI applications was rejected for Co-Cr_C, Ni-Cr_C, and Co-Cr_L specimens. The ZrO2 _M and Ti-L were not affected significantly except for the Ra of Ti_L.
Several factors, including the oxide layer thickness of the metal,5,8, 9, 10,12 production technique of the framework material,13 alloy
Conclusions
Based on the findings of this in vitro study, the following conclusions were drawn:
- 1.
A 30-minute 1.5-T MRI application decreased the metal-ceramic bond of Ni-Cr alloy but increased the bond of cast and DMLS Co-Cr alloys. A 30-minute 3.0-T MRI application increased the metal-ceramic bond of Ni-Cr alloy while decreasing the bond of cast and DMLS Co-Cr alloys.
- 2.
A 30-minute 1.5-T MRI application increased the surface roughness of DMLS Ti but decreased the roughness of DMLS Co-Cr alloy. A 30-minute
Acknowledgments
The authors thank Professor Dr Semra İde for helpful discussions and Dr Fatih Erol for his contributions in statistical analyses of this study.
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Supported by the Scientific Research Commission of Gulhane Military Medical Academy as grant sponsor.