caa a22 4500 47578328X CHVBK 20180406123650.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1023/A:1008903224180 doi (NATIONALLICENCE)springer-10.1023/A:1008903224180 Variation in flexural properties of photo-pultruded composite archwires: analyses of round and rectangular profiles [Elektronische Daten] [D. Fallis, R. Kusy] Prototype continuous, unidirectional, fiber-reinforced composite archwires were manufactured into round and rectangular profiles utilizing a photo-pultrusion process. Both 0.022 inch (0.56 mm) diameter and 0.021 × 0.028 inch (0.53 × 0.71 mm) rectangular composites were formed utilizing commercially available S2-glass® reinforcement within a polymeric matrix. Reinforcement was varied according to the number, denier and twists per inch (TPI) of four S2-glass® yarns to volume levels of 32-74% for round and 41-61% for rectangular profiles. Cross-sectional geometry was evaluated via light microscopy to determine loading characteristics; whereas two flexural properties (the elastic moduli and flexural strengths) were determined by 3-point bending tests. Morphological evaluation of samples revealed that as the TPI increased from 1 to 8, the yarns were more separated from one another and distributed more peripherally within a profile. For round and rectangular profiles utilizing 1 TPI fibers, moduli increased with fiber content approaching theoretical values. For round profiles utilizing 1 TPI and 4 TPI fibers, flexural strengths increased until the loading geometry was optimized. In contrast, the flexural strengths of composites that were pultruded with 8 TPI fibers were not improved at any loading level. Doubling the denier of the yarn, without altering the loading, increased both the moduli and flexural strengths in rectangular samples; whereas, the increases observed in round samples were not statistically significant. At optimal loading the maximum mean moduli and strengths equaled 53.6 ± 2.0 and 1.36 ± 0.17 (GPa) for round wire and equaled 45.7 ± 0.8 and 1.40 ± 0.05 (GPa) for rectangular wires, respectively. These moduli were midway between that of martensitic NiTi (33.4 GPa) and beta-titanium (72.4 GPa), and produced about one-quarter the force of a stainless steel wire per unit of activation. Values of strengths placed this composite material in the range of published values for beta-titanium wires (1.3-1.5 GPa). © 2000 Kluwer Academic Publishers Kluwer Academic Publishers, 2000 Fallis D. Department of Orthodontics, University of North Carolina at Chapel Hill, 27599-7455, Chapel Hill, NC, USA aut Kusy R. Department of Biomedical Engineering, Curriculum in Applied and Material Sciences, University of North Carolina at Chapel Hill, 27599-7455, Chapel Hill, NC, USA aut Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/11(2000-11-01), 683-693 0957-4530 11:11<683 2000 11 10856 https://doi.org/10.1023/A:1008903224180 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1008903224180 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fallis D. Department of Orthodontics, University of North Carolina at Chapel Hill, 27599-7455, Chapel Hill, NC, USA aut NATIONALLICENCE 700 1- Kusy R. Department of Biomedical Engineering, Curriculum in Applied and Material Sciences, University of North Carolina at Chapel Hill, 27599-7455, Chapel Hill, NC, USA aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/11(2000-11-01), 683-693 0957-4530 11:11<683 2000 11 10856 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer