Polymers for conventional, subtractive, and additive manufacturing of occlusal devices differ in hardness and flexural properties but not in wear resistance
| Autor: | Ralf J. Kohal, Guido Sterzenbach, Benedikt Christopher Spies, Marei Krügel, Stefano Pieralli, Florian Beuer, Gregor Wemken, Christian Wesemann |
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| Rok vydání: | 2021 |
| Předmět: |
Stereolithography
Materials science Polymers Surface Properties 02 engineering and technology Molding (process) law.invention 03 medical and health sciences 0302 clinical medicine Flexural strength Hardness law Flexural Strength Materials Testing Humans General Materials Science Composite material General Dentistry chemistry.chemical_classification Enamel paint Flexural modulus 030206 dentistry Polymer 021001 nanoscience & nanotechnology chemistry Mechanics of Materials visual_art Vickers hardness test visual_art.visual_art_medium 0210 nano-technology Material properties |
| Zdroj: | Dental Materials. 37:432-442 |
| ISSN: | 0109-5641 |
| DOI: | 10.1016/j.dental.2020.11.020 |
| Popis: | Objectives To investigate the wear resistance of polymers for injection molding, subtractive and additive manufacturing of occlusal devices in comparison with enamel antagonist wear and material properties (i.e., hardness, flexural strength, and flexural modulus). Methods Injection molding was compared with milling and the additive technologies stereolithography, low force stereolithography, and digital light processing. For each material, eight specimens were produced for wear measurements. Extracted human premolars served as indenters. All samples were subjected to two series of a 2-body wear test consisting of 200,000 circular loading cycles with an applied load of 1) 20 N and 2) 50 N in a thermocycling environment (5/55 °C, 30 s, 3860 cycles, H2O). Wear resistance was characterized by means of maximum depth and volume of the resulting traces. In addition, enamel wear of the indenters and Vickers hardness, flexural strength, and flexural modulus of the polymers were determined. Wear was statistically analyzed with linear general models for repeated measures and material properties with one-way ANOVA with post-hoc Tukey-HSD tests. Results Wear of the antagonists was not influenced by the material (P ≥ 0.343). Likewise, no differences in wear resistance were found between materials after cyclic loading with 20 N or 50 N (P ≥ 0.074). Material properties investigated revealed decreased values for the resins for the additive manufacturing with the exception of flexural strength of one material. Significance Within the limitations of this in-vitro study, arylates for conventional, subtractive, and additive manufacturing of occlusal devices differ in material properties but not in wear resistance and antagonist wear. |
| Databáze: | OpenAIRE |
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