(1) Background: Digital technologies are available for denture base fabrication, but there is a lack of scientific data on the mechanical and chemical properties of the materials produced in this way. Therefore, the aim of this study was to investigate the residual monomer content, flexural strength and microhardness of denture base materials as well as correlations between investigated parameters. (2) Methods: Seven denture base materials were used: one conventional heat cured polymethyl methacrylate, one polyamide, three subtractive manufactured materials and two additive manufactured materials. High-performance liquid chromatography was used to determine residual monomer content and the test was carried out in accordance with the specification ISO No. 20795-1:2013. Flexural strength was also determined according to the specification ISO No. 20795-1:2013. The Vickers method was used to investigate microhardness. A one-way ANOVA with a Bonferroni post-hoc test was used for the statistical analysis. The Pearson correlation test was used for the correlation analysis. (3) Results: There was a statistically significant difference between the values of residual monomer content of the different denture base materials (p < 0.05). Anaxdent pink blank showed the highest value of 3.2% mass fraction, while Polident pink CAD-CAM showed the lowest value of 0.05% mass fraction. The difference between the flexural strength values of the different denture base materials was statistically significant (p < 0.05), with values ranging from 62.57 megapascals (MPa) to 103.33 MPa. The difference between the microhardness values for the different denture base materials was statistically significant (p < 0.05), and the values obtained ranged from 10.61 to 22.86 Vickers hardness number (VHN). A correlation was found between some results for the material properties investigated (p < 0.05). (4) Conclusions: The selection of contemporary digital denture base manufacturing techniques may affect residual monomer content, flexural strength and microhardness but is not the only criterion for achieving favourable properties.

(1) Background: Digitally fabricated denture base materials are increasingly used in everyday clinical practice, but scientific data on their properties is limited, especially regarding water sorption and water solubility. Water absorbed in denture base material penetrates between the polymer chains, acts as a plasticiser, and negatively affects mechanical properties. Residual monomers and other chemicals not chemically bonded in the polymer matrix can dissolve in water and may cause biological consequences such as irritation and inflammation of the oral mucosa or even allergic reactions. This can also have a deteriorating effect on the materials. Therefore, the aim of this study was to investigate the water sorption and water solubility of digitally fabricated denture base materials. (2) Methods: Six denture base materials were used in this investigation: three subtractively manufactured materials, two additively manufactured materials, and one heat-cured poly(methyl methacrylate) material as a control group. The investigation was carried out according to ISO 20795-1:2013. (3) Results: Water sorption for the control group was 28.02 µg/mm³, while all digitally fabricated denture base materials showed statistically significantly lower values, ranging between 20.42 and 23.54 µg/mm³, with a statistical difference observed within the subtractively manufactured group. All materials had water sorption values below the upper limit of 32 µg/mm³ specified in ISO 20795-1:2013. Water solubility for subtractively manufactured materials ranged between 0.04 and 0.40 µg/mm³, with values both higher and lower than the control group, but with no statistical difference. Water solubility for additively manufactured materials was 3.01 and 3.22 µg/mm³, which was statistically significantly higher than the control group, and these results exceeded the upper limit of 1.6 µg/mm³ specified in ISO 20795-1:2013. (4) Conclusions: Digitally fabricated denture base materials showed improved water sorption compared to the heat-cured material, while water solubility for subtractively manufactured materials was similar to the heat-cured material and poorer for additively manufactured denture base materials, with results that did not meet the minimum requirements set by ISO 20795-1:2013.

To determine and compare articular eminence inclination (AEI) values between Croatian and American skulls. The study was carried out on 210 human dry skulls divided into Croatian (early medieval, late medieval and contemporary), and American (Illinois, Kentucky, contemporary African Americans and American Caucasians) groups. AEI was measured by two methods (M1 and M2) on 5 sagittal sections through virtual silicone impressions of articular eminence. The obtained results were analyzed at the significance level of p0.05). AEI M2 values were statistically significantly higher than AEI M1 values (p<0.05). Comparing the AEI values between different group of skulls can reveal insights into TMJ morphology, and can also shed light on possible evolutionary adaptations, dietary influences, and genetic diversity across cultures. According to the results of this study, AEI values were not affected by group of skulls, body side, sex and age or at least not as much as needed for significant changes. However, a measurement method significantly influences AEI values, with higher AEI M2 values compared to AEI M1 values.