Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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How do imaging protocols affect the assessment of root-end fillings?

  • Fernanda Ferrari Esteves Torres (Department of Restorative Dentistry, Sao Paulo State University (UNESP), School of Dentistry) ;
  • Reinhilde Jacobs (OMFS IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven) ;
  • Mostafa EzEldeen (OMFS IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven) ;
  • Karla de Faria-Vasconcelos (OMFS IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven) ;
  • Juliane Maria Guerreiro-Tanomaru (Department of Restorative Dentistry, Sao Paulo State University (UNESP), School of Dentistry) ;
  • Bernardo Camargo dos Santos (Department of Nuclear Energy, Federal University of Rio de Janeiro (UFRJ)) ;
  • Mario Tanomaru-Filho (Department of Restorative Dentistry, Sao Paulo State University (UNESP), School of Dentistry)
  • Received : 2020.08.17
  • Accepted : 2020.11.11
  • Published : 2022.02.28
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Abstract

Objectives: This study investigated the impact of micro-computed tomography (micro-CT)-based voxel size on the analysis of material/dentin interface voids and thickness of different endodontic cements. Materials and Methods: Following root-end resection and apical preparation, maxillary premolars were filled with mineral trioxide aggregate (MTA), Biodentine, and intermediate restorative material (IRM) (n = 24). The samples were scanned using micro-CT (SkyScan 1272; Bruker) and the cement/dentin interface and thickness of materials were evaluated at voxel sizes of 5, 10, and 20 ㎛. Analysis of variance and the Tukey test were conducted, and the degree of agreement between different voxel sizes was evaluated using the Bland and Altman method (p < 0.05). Results: All materials showed an increase in thickness from 5 to 10 and 20 ㎛ (p < 0.05). When evaluating the interface voids, materials were similar at 5 ㎛ (p > 0.05), while at 10 and 20 ㎛ Biodentine showed the lowest percentage of voids (p < 0.05). A decrease in the interface voids was observed for MTA and IRM at 20 ㎛, while Biodentine showed differences among all voxel sizes (p < 0.05). The Bland-Altman plots for comparisons among voxel sizes showed the largest deviations when comparing images between 5 and 20 ㎛. Conclusions: Voxel size had an impact on the micro-CT evaluation of thickness and interface voids of endodontic materials. All cements exhibited an increase in thickness and a decrease in the void percentage as the voxel size increased, especially when evaluating images at 20 ㎛.

Keywords

Acknowledgement

This work was supported in part by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior, Brasil (CAPES) Finance Code 001, and was fully supported by the Sao Paulo Research Foundation - FAPESP (grant numbers 2016/00321-0, 2017/22481-1, and 2017/19049-0).

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