Effect of cellulose nanofiber content on flexural properties of a model, thermoplastic, injection-molded, polymethyl methacrylate denture base material
Effect of cellulose nanofiber content on flexural properties of a model, thermoplastic, injection-molded, polymethyl methacrylate denture base material
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DOI：
10.1016/j.jmbbm.2019.103513
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发表时间：
2020-02-01
影响因子：
3.9
通讯作者：
Vallittu, Pekka K.
中科院分区：
文献类型：
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作者：
Kawaguchi, Tomohiro;Lassila, Lippo V. J.;Vallittu, Pekka K.
由木质纤维制成的纤维素纳米纤维（CNF）被认为是一种有潜力替代传统纤维的增强材料。本研究的目的是研究CNF对CNF增强、注射成型、聚甲基丙烯酸甲酯（PMMA）义齿基托材料抗弯性能的影响。试验样品由热塑性义齿基托树脂模型采用注射成型技术制备。将树脂颗粒与CNF混合（以获得不同的重量百分比5、10、15和23 wt%）。无CNF的PMMA作为对照（0 wt%）。试验前，将试件（n = 12/组）在37℃水中浸泡50 h，采用三点弯曲试验测定试件的抗弯强度和模量。统计评价包括单向方差分析和Student-Newman-Keuls检验（alpha = 0.05）。添加0、5、10、15和23% CNF的抗折强度均值和标准差分别为49.4（+/- 0.7）、56.4（+/- 1.3）、63.5（+/- 2.0）、72.0（+/- 4.7）和96.8 (+/- 4.0)MPa。添加相同浓度CNF的弯曲模量均值和标准差分别为1.31（+/- 0.02）、1.56（+/- 0.05）、1.99（+/- 0.14）、2.40（+/- 0.15）和3.96 (+/- 0.08)GPa。cnf增强PMMA的抗弯强度和模量显著高于纯PMMA （p < 0.05）。因此，CNF的掺入可以显著改善热塑性PMMA义齿基托材料的弯曲性能。
Cellulose nanofiber (CNF) made from wood-derived fiber is considered as a potential alternative reinforcing material to conventional fibers. The aim of this study was to investigate the effect of CNF on the flexural properties of CNF-reinforced, injection molded, polymethyl methacrylate (PMMA) denture base material. Test specimens were fabricated from a model thermoplastic denture base resin using the injection molding technique. The resin pellets were mixed with CNF (to obtain different weight percentages 5, 10, 15, and 23 wt%). PMMA without CNF served as the control (0 wt%). Prior to the testing, the test specimens (n = 12/group) were water-immersed at 37 degrees C water for 50 h. The flexural strengths and moduli of the specimens were determined using three-point bending tests. Statistical evaluation included a one-way analysis of variance and the Student-Newman-Keuls test (alpha = 0.05). The mean and standard deviation of flexural strengths with the addition of 0, 5, 10, 15 and 23% CNF were 49.4 (+/- 0.7), 56.4 (+/- 1.3), 63.5 (+/- 2.0), 72.0 (+/- 4.7), and 96.8 (+/- 4.0) MPa, respectively. The mean and standard deviation of flexural modulus with the addition of the same concentrations of CNF were 1.31 (+/- 0.02), 1.56 (+/- 0.05), 1.99 (+/- 0.14), 2.40 (+/- 0.15), and 3.96 (+/- 0.08) GPa, respectively. The flexural strengths and moduli of the CNF-reinforced PMMA were significantly higher than those of pure PMMA (p < 0.05). Hence, incorporation of CNF can significantly improve flexural properties of a thermoplastic PMMA denture base material.