Abstract
This study aimed to investigate the artifacts induced by crowns composed of different materials with prepared teeth and titanium implants. Resin, metal-ceramic, ceramic and zirconia crowns were fabricated and placed onto the prepared teeth on a human cadaver head or titanium implants with prosthesis abutments on a dry human mandible. The samples were scanned on a 1.5 T MRI apparatus, and artifact areas were defined as the signal intensity and signal loss adjacent to the prosthesis and measured by a threshold tool with ImageJ2x. Data were analyzed using SPSS 22.0. Resin, ceramic, zirconia, and precious metal-ceramic crowns barely produced artifacts on the cadaver skull (p > 0.999). By contrast, pure Ti and nonprecious metal-ceramic crowns created significant artifacts (p < 0.001). The average artifacts reduction of double Au-Pt and Ag-Pd metal-ceramic crowns combined with titanium implants and abutments was 79.49 mm2 (p < 0.001) and 74.17 mm2 (p < 0.001) respectively, while artifact areas were increased in double Co-Cr and Ni–Cr metal-ceramic crowns by 150.10 mm2 (p < 0.001) and 175.50 mm2 (p < 0.001) respectively. Zirconia, ceramic and precious metal-ceramic crowns induce less MRI artifacts after tooth preparation while precious metal-ceramic crowns alleviate artifacts in combination with titanium implants.
Highlights
This study aimed to investigate the artifacts induced by crowns composed of different materials with prepared teeth and titanium implants
The results revealed that the resin crown barely produced artifacts, and its signal was similar to that of the surrounding soft tissue (Fig. 3a)
Moderate arc-shaped artifacts could be observed around pure Ti metal-ceramic crowns
Summary
This study aimed to investigate the artifacts induced by crowns composed of different materials with prepared teeth and titanium implants. Metal-ceramic, ceramic and zirconia crowns were fabricated and placed onto the prepared teeth on a human cadaver head or titanium implants with prosthesis abutments on a dry human mandible. Susceptibility artifacts, referred to as metal artifacts, are caused by differences in susceptibility between a prosthesis and the adjacent tissue, thereby inducing inhomogeneity in a magnetic field[6]. Metallic prostheses, such as different kinds of full crowns and titanium implant restorations may distort images during MRI examinations and interfere with clinical diagnosis[7,8,9]. Titanium implants are stable and well-known prostheses for missing teeth and have gained clinical preference because of their desirable biomechanics, biocompatibility and non-invasive p roperties[13,14]
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