Yamazaki Yukiko, Ito Takao, Ogawa Toru, Hong Guang, Yamada Yukie, Hamada Taizo, Sasaki Keiichi
Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry.
Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry.
J Oral Sci. 2020 Dec 23;63(1):111-113. doi: 10.2334/josnusd.20-0245. Epub 2020 Dec 9.
A study was conducted to evaluate the basic mechanical properties of a pure cellulose nanofiber (CNF) material in comparison with a commercial denture base material (polymethylmethacrylate [PMMA] acrylic resin). The working hypothesis was that CNFs have potential for use as denture base materials. Pure CNF specimens fabricated under various conditions were examined. The flexural strength (FS) and flexural modulus (FM) of the specimens were measured using the three-point bending test, and the morphologies of the fractured surfaces were examined using scanning electron microscopy. Addition of tricalcium phosphate to dehydrate the CNFs did not improve their FS or FM. Conversely, substitution with methanol effectively improved the dehydration process and significantly affected the mechanical properties of the CNFs. As the degree of CNF defibration increased, the physical properties of the specimens improved significantly. However, addition of CNFs to PMMA liquid to create CNF-reinforced PMMA did not improve the mechanical properties. Pure CNF specimens fabricated under particular conditions had higher FS and FM values than the control, suggesting that CNFs have potential as a "petroleum-free" alternative to acrylic resin denture base materials. Pure CNF would be potentially useful as a denture base material, and presumably applicable to computer-aided design/manufacture (CAD/CAM).
开展了一项研究，以评估纯纤维素纳米纤维（CNF）材料与商用义齿基托材料（聚甲基丙烯酸甲酯[PMMA]丙烯酸树脂）相比的基本力学性能。工作假设是CNF有作为义齿基托材料的潜力。对在各种条件下制备的纯CNF试样进行了检测。使用三点弯曲试验测量试样的弯曲强度（FS）和弯曲模量（FM），并使用扫描电子显微镜检查断裂表面的形态。添加磷酸三钙以使CNF脱水并未改善其FS或FM。相反，用甲醇替代有效地改善了脱水过程，并显著影响了CNF的力学性能。随着CNF解纤程度的增加，试样的物理性能显著改善。然而，向PMMA液体中添加CNF以制备CNF增强的PMMA并未改善其力学性能。在特定条件下制备的纯CNF试样的FS和FM值高于对照组，表明CNF有潜力作为丙烯酸树脂义齿基托材料的“无石油”替代品。纯CNF可能作为义齿基托材料有用，并且大概适用于计算机辅助设计/制造（CAD/CAM）。
