Elsevier

The Journal of Prosthetic Dentistry

Volume 124, Issue 6, December 2020, Pages 809.e1-809.e7
The Journal of Prosthetic Dentistry

Research and Education
Effect of 1.5-T and 3.0-T magnetic resonance imaging on the ceramic adhesion and physical properties of prosthetic substructures

https://doi.org/10.1016/j.prosdent.2020.04.027Get rights and content

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.

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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  • Cited by (0)

    Supported by the Scientific Research Commission of Gulhane Military Medical Academy as grant sponsor.

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