How image-processing parameters can influence the assessment of dental materials using micro-CT
Torres Fernanda Ferrari Esteves, Jacobs Reinhilde, EzEldeen Mostafa, de Faria-Vasconcelos Karla, Guerreiro-Tanomaru Juliane Maria, dos Santos Bernardo Camargo, Tanomaru-Filho Mario,
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( Torres Fernanda Ferrari Esteves ) - Sao Paulo State University School of Dentistry Department of Restorative Dentistry
( Jacobs Reinhilde ) - University Hospitals Leuven Faculty of Medicine Department of Imaging and Pathology
( EzEldeen Mostafa ) - University Hospitals Leuven Faculty of Medicine Department of Imaging and Pathology
( de Faria-Vasconcelos Karla ) - University Hospitals Leuven Faculty of Medicine Department of Imaging and Pathology
( Guerreiro-Tanomaru Juliane Maria ) - Sao Paulo State University School of Dentistry Department of Restorative Dentistry
( dos Santos Bernardo Camargo ) - Federal University of Rio de Janeiro Department of Nuclear Energy
( Tanomaru-Filho Mario ) - Sao Paulo State University School of Dentistry Department of Restorative Dentistry
Abstract
Purpose: The aim of this study was to evaluate the influence of voxel size and different post-processing algorithms on the analysis of dental materials using micro-computed tomography (micro-CT).
Materials and Methods: Root-end cavities were prepared in extracted maxillary premolars, filled with mineral trioxide aggregate (MTA), Biodentine, and Intermediate Restorative Material (IRM), and scanned using micro-CT. The volume and porosity of materials were evaluated and compared using voxel sizes of 5, 10, and 20 μm, as well as different software tools (post-processing algorithms). The CTAn or MeVisLab/Materialise 3-matic software package was used to perform volume and morphological analyses, and the CTAn or MeVisLab/Amira software was used to evaluate porosity. Data were analyzed using 1-way ANOVA and the Tukey test (P<0.05).
Results: Using MeVisLab/Materialise 3-matic, a consistent tendency was observed for volume to increase at larger voxel sizes. CTAn showed higher volumes for MTA and IRM at 20 μm. Using CTAn, porosity values decreased as voxel size increased, with statistically significant differences for all materials. MeVisLab/Amira showed a difference for MTA and IRM at 5 μm, and for Biodentine at 20 μm. Significant differences in volume and porosity were observed in all software packages for Biodentine across all voxel sizes.
Conclusion: Some differences in volume and porosity were found according to voxel size, image-processing software, and the radiopacity of the material. Consistent protocols are needed for research evaluating dental materials.
키워드
Dental Materials; Image Processing, Computer-Assisted; Imaging, Three-Dimensional; X-ray Microtomography
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