IADR Abstract Archives
Radiopacity of CAD/CAM Materials and Resin-Based Composites
Objectives: This study investigated radiopacity versus chemical composition of CAD/CAM restorative materials and their underlying resin-based materials such as core build-up, base and luting cements.
Methods: One- and two-mm thick specimens (n=3) prepared from five CAD/CAM and six resin-based materials were radiographed adjacent to an aluminium step wedge and a section of a tooth. The digital images were analysed, and the radiopacity of each specimen was determined according to ISO 1311-2014. Scanning electron micrographs (n=1) of the material surface at 1000x and 5000x magnifications were imaged coupled with an energy dispersed x-ray detector for elemental mapping and quantitative chemical analysis.
Statistical analyses of radiopacity expressed in mm Al (n=15) were carried out using the Kruskal-Wallis test followed by pairwise comparisons at a significance level of 0.05.
Results: The radiopacities of the CAD/CAM materials in ascending order were: Vita Enamic (VE), Vita Mark II (VM II), CeraSmart (CS), Lava Ultimate (LU), Grandio blocs (GB). At 1-mm thickness, VE and VM II showed significantly lower median radiopacities (0.72±0.01and 0.79±0.02 mm Al, respectively) compared to enamel and other CAD/CAM materials. While at 2-mm thickness, no statistically significant difference in radiopacity was detected between VE, enamel, dentin and various resin composites except Filtek Z250 (FZ) and Tetric-N Ceram (TN). The EDS elemental analysis revealed variable levels of zirconium distributed among all tested specimens, while barium and strontium were found in some materials as radiopacifying elements.
Conclusions: The investigated materials showed variable differences in radiopacity in comparison to tooth structure, as assessed in two thicknesses. Material composition and thickness affected the radiographic results. The nearly radiolucent hybrid ceramics meant that the radiopacity level of the underlying bonding resin materials was critical for the detection of the restoration margins.
Methods: One- and two-mm thick specimens (n=3) prepared from five CAD/CAM and six resin-based materials were radiographed adjacent to an aluminium step wedge and a section of a tooth. The digital images were analysed, and the radiopacity of each specimen was determined according to ISO 1311-2014. Scanning electron micrographs (n=1) of the material surface at 1000x and 5000x magnifications were imaged coupled with an energy dispersed x-ray detector for elemental mapping and quantitative chemical analysis.
Statistical analyses of radiopacity expressed in mm Al (n=15) were carried out using the Kruskal-Wallis test followed by pairwise comparisons at a significance level of 0.05.
Results: The radiopacities of the CAD/CAM materials in ascending order were: Vita Enamic (VE), Vita Mark II (VM II), CeraSmart (CS), Lava Ultimate (LU), Grandio blocs (GB). At 1-mm thickness, VE and VM II showed significantly lower median radiopacities (0.72±0.01and 0.79±0.02 mm Al, respectively) compared to enamel and other CAD/CAM materials. While at 2-mm thickness, no statistically significant difference in radiopacity was detected between VE, enamel, dentin and various resin composites except Filtek Z250 (FZ) and Tetric-N Ceram (TN). The EDS elemental analysis revealed variable levels of zirconium distributed among all tested specimens, while barium and strontium were found in some materials as radiopacifying elements.
Conclusions: The investigated materials showed variable differences in radiopacity in comparison to tooth structure, as assessed in two thicknesses. Material composition and thickness affected the radiographic results. The nearly radiolucent hybrid ceramics meant that the radiopacity level of the underlying bonding resin materials was critical for the detection of the restoration margins.