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The mechanical properties of both polymethyl methacrylate (PMMA) and polyethylene terephthate (PET) were examined in tensile and three-point bending tests, as well as their bond and interlayer shear strengths were assessed. The results obtained were employed in computer simulation of mechanical loading of temporary removable complete dentures (TRCDs). It was shown that the variations of the elastic moduli of the dental materials studied did not exceed 15.6%; the ultimate strength of PET was higher than that of PMMA by ~2.2 times in tension and by ~1.9 times in bending. Elongation at break was greater for the PET specimens than those for the PMMA ones by ~2.3 times in tension and by ~3.1 times in bending. Computer simulation has shown that when the load was applied at the angle of 90°, the tooth fractured in all cases. Stresses were much lower in the denture base concerning the critical levels. Therefore, the adhesion conditions considered did not affect the pattern of their failure, and the critical load was the same for both denture base materials. When the load was applied to canines at the angle of 45°, the critical load was below the specified level of 100 N in the PMMA denture base due to the peculiarities of TRCD design and the lower strength of PMMA. When both canines and incisors were loaded at the angle of 45°, the PET denture base could withstand the greater critical load than the PMMA one. Both mechanical tests and computer simulation results enabled to conclude that PET is the prospect denture base material for the manufacture of TRCDs and dental orthopedic treatment. [ABSTRACT FROM AUTHOR]

The article titled "Topical section 'Advanced Testing of Soft Polymer Materials'" discusses the importance of using advanced testing methods to characterize and analyze soft polymer materials. The increasing demand for enhanced properties and capabilities in various industries, such as e-mobility, energy generation, information technology, soft robotics, and medical engineering, has led to the need for predictive and advanced laboratory testing. The article emphasizes the importance of accuracy, relevance, productivity, and cost-effectiveness in laboratory testing, as well as the development of new concepts for soft polymeric materials, including nanotechnology, self-healing, and eco-design. The scope of the article includes the development and application of advanced testing methods for chemical, rheological, mechanical, thermal, electrical, and magnetic analysis, as well as concepts for predictive testing and realistic load simulation. The article highlights the potential of simulation tools and artificial intelligence in predicting the behavior and durability of soft polymer materials. [Extracted from the article]