Abstract
Statement of problem
Magnetic resonance imaging (MRI) is a cross-sectional imaging technique that is widely
used in the detection of pathologies in the head and neck region. However, information
is lacking about the effect of MRI imaging on the clinical success of fixed partial
dentures (FPDs).
Purpose
The purpose of this in vitro study was to analyze the effect of MRI on the physical
properties and ceramic adhesion of FPD substructure materials.
Material and methods
Three hundred disk (12×1 mm) and 255 rectangular (4×2×2 mm) specimens were prepared
with different fabrication techniques for 5 experimental groups: direct metal laser
sintering (DMLS) with Co-Cr and Ti; casting with Co-Cr and Ni-Cr; and milling with
ZrO2. After ceramic application, the disk specimens were subjected to aging and divided
into 3 subgroups (n=20) with exposure to 1.5-T and 3.0-T MRI brain scans for 30 minutes
and no exposure (control). The shear bond strength (SBS) of the specimens was measured
by using a universal testing machine. The rectangular specimens were exposed to MRI
with the same procedure, and the nanostructure of the specimens was analyzed with
the small-angle X-ray scattering (SAXS) method to detect the nanoscale structural
effects of MRI. The average surface roughness (Ra) and Vickers microhardness (Vh)
were also measured for complementary analyses. SBS, Ra, and Vh values were statistically
analyzed by 1-way ANOVA and the Tukey honestly significant difference test (α=.05).
Results
The SBS (MPa) of casting groups (P<.001) and DMLS with the Co-Cr group (P<.05) were significantly affected by MRI exposures. The significant differences were
seen on the Ra of casting (P<.001) and DMLS with Co-Cr (P<.05) and Ti (P<.01) groups. Also, the Vh of the casting with Co-Cr (P<.001) and Ni-Cr (P<.01) groups showed significant differences. The SAXS analysis indicated that the
physical properties of materials were influenced by MRI exposure.
Conclusions
The results indicated that MRI applications affected the metal-ceramic adhesion of
Co-Cr and Ni-Cr dental alloys produced by casting and the DMLS technique.
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Article info
Publication history
Published online: September 30, 2020
Footnotes
Supported by the Scientific Research Commission of Gulhane Military Medical Academy as grant sponsor.
Identification
Copyright
© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
