PSI - Issue 74

Hrubanová A. et al. / Procedia Structural Integrity 74 (2025) 33–37 Anna Hrubanová / Structural Integrity Procedia 00 (2025) 000–000

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was created to keep the specimens stable during scanning (see Fig. 1 A). This cylinder was inserted into a block of polystyrene prior to scanning (see Fig. 1 B). The voxel size of the micro-CT images (see Fig. 1 C) was 0.02 mm x

0.02 mm x 0.02 mm. Fig. 1. Specimen preparation for micro-CT scanning silicone cylinder (A) with all specimens placed into polystyrene (B); micro-CT image (C) 3. Results The results show differences in strength (maximum stress) and fracture strain among the four materials (Fig.2). For the maximum values of strength and fracture strain (Fig. 2 – right), the Anderson-Darling test was used to confirm the normal distribution of the data, and one-way ANOVA was performed to compare the two parameters across material. Significant differences were found for both material parameters (p<0.001). The post-hoc analysis (Tukey pairwise) showed differences between all the material pairs as for the strength; as for the fracture strain, mean maximal strain of material Permlastic showed differences with all the other materials, no significant difference was

Fig. 2. Stress strain curves for all tested elastomeric impression materials (mean and standard deviation) - left and the maximum values of stress and strain for each curve - right.