Dental glass ionomer cement reinforced by cellulose microfibers and cellulose nanocrystals

Menezes-Silva, Rafael; Pereira, Fabiano Vargas; Mota, Felipe A.P.; Watanabe, Evandro; Soares, Suelleng Maria Cunha Santos; Santos, Maria Helena

doi:10.1016/j.msec.2015.08.041

Cited by 70 publications

(57 citation statements)

References 23 publications

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“…The cellulose nanocrystals were formed by nanoparticles containing several hydroxyl groups on their surfaces and with a large specific area. Aggregation of the nanocrystals was thus common, as expected, mainly due to the strong hydrogen links formed between cellulose nanoparticles [45] . The coconut cellulose nanocrystals examined in this study had length L values of 89-320 nm (average of 264.9±23.0 nm) and average diameter D of 8.10±1.21 nm.…”

Section: Characterization Of Coconut Fibers and Nanocrystalssupporting

confidence: 65%

“…These results agree well with previously obtained data for cellulose nanocrystals extracted from coconut fibers, namely, L values of 80-500 nm and D values of 4-9 nm [5,26,40] . Silva et al [45] also reported an L value of 145 nm and average D of 1.5 nm for nanocrystals obtained from eucalyptus, while Costa et al [6] reported L = 157 nm and average D = 5.7 nm for nanocrystals obtained from licuri fiber. The average aspect ratio (L/D) determined in the present study was 32.7±5.1, which confirms the potential of the coconut cellulose nanocrystals for use as reinforcement agents for polymeric matrixes in the development of composites, as proposed by Rosa et al [40] and Machado et al [5] , who reported L/D values of 39±16 and 38.9±4.7, respectively.…”

Section: Characterization Of Coconut Fibers and Nanocrystalsmentioning

confidence: 97%

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Production of biodegradable starch nanocomposites using cellulose nanocrystals extracted from coconut fibers

et al. 2017

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Section: Characterization Of Coconut Fibers and Nanocrystalssupporting

confidence: 65%

Section: Characterization Of Coconut Fibers and Nanocrystalsmentioning

confidence: 97%

Production of biodegradable starch nanocomposites using cellulose nanocrystals extracted from coconut fibers

et al. 2017

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“…SEM/EDS and FTIR analyses of the modified biomaterials suggested that the composites maintained the main characteristics of their precursors (12). Normally, in level I biocompatibility tests the biomaterials are inserted in polyethylene or silicone tubes (16)(17)(18)(19)(20).…”

Section: Discussionmentioning

confidence: 99%

“…and filtered. The final concentration of cellulose nanocrystals in the dispersion was approximately 1% by mass (12).…”

Section: Composite Developmentmentioning

confidence: 99%

“…Studies have reported that the cellulosic fiber-modified glass ionomer cement showed increased compressive strength and abrasion resistance and higher bond strength to dental structures. In a recent study (12), glass ionomer cement was reported as completely interlaced with cellulose nanocrystals randomly distributed throughout the cement matrix, suggesting union between them. Therefore, following the logic of the experiments, the aim of this study was to evaluate the biocompatibility of a commercial glass ionomer cement modified with cellulose microfibers and cellulose nanocrystals.…”

Section: Introductionmentioning

confidence: 95%

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Biocompatibility of a New Dental Glass Ionomer Cement with Cellulose Microfibers and Cellulose Nanocrystals

et al. 2017

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Developing new restorative materials should avoid damage to tissue structures. This study evaluated the biocompatibility of a commercial dental glass ionomer cement (GIC) mechanically reinforced with cellulose microfibers (GIC+CM) or cellulose nanocrystals (GIC+CN) by implantation of three test specimens in subcutaneous tissue in the dorsal region of 15 Rattus norvegicus albinus rats. Each rat received one specimen of each cement, resulting in the following groups (n=15): Group GIC (Control), Group GIC+CM and Group GIC+NC. After time intervals of 7, 30 and 60 days, the animals were sacrificed and the following aspects were histologically evaluated: type of inflammatory cells, fibroblasts, blood vessels, macrophages, giant cells, type of inflammatory reaction and capsule thickness (µm). These events were scored as (-) absent, (+) light, (++) moderate and (+++) intense. The results were statistically analyzed by Kruskal-Wallis test and Mann-Whitney post test. At 7 days, Group GIC+NC showed more favorable tissue repair because quantitatively there were more fibroblasts (p=0.022), fewer macrophages (p=0.008) and mononuclear cells (p=0.033). Polymorphonuclear neutrophils and giant cells were absent in all experimental periods. At 60 days, test specimens in Group GIC+NC were surrounded by a fibrous tissue capsule with reduced thickness (26.72±2.87 µm) in comparison with Group GIC+CM (41.21±3.98 µm) (p=0.025). In general, all biomaterials showed satisfactory biocompatibility, but glass ionomer cement modified with cellulose nanocrystals showed a more advanced tissue repair.

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Development and application starch films: PBAT with additives for evaluating the shelf life of Tommy Atkins mango in the fresh‐cut state

Leal

Rosa

Penha

et al. 2019

J of Applied Polymer Sci

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In this study, formulations of cassava starch and poly(butylene adipate-co-terephthalate) flexible films were developed, with glycerol, coconut nanocellulose, annatto, and citric acid in different concentrations, as well as the effectiveness of the selected materials in fresh-cut mangoes storage was evaluated. The tensile strength of the different formulations varied from 1.90 (E4) to 6.65 MPa (E3c), and the strain varied from 206.31 (E1c) to 278.41% (E8); this variation was dependent on the percentage of the polymer matrix incorporated. The a w values of the formulations ranged from 0.396 (E2) to 0.569 (E3c). The Formulations E4 and E7 (with additives) presented good properties and were selected to condition mangoes. The micrographs of these films showed regions of micropores that can facilitate the diffusion of water from the packaged product to the surface, allowing decreases in moisture and a w , which is associated with higher color maintenance during fruit storage. E7 presented better barrier properties than E4 (lower values of WVP and water solubility) which may have influenced in a positive way to maintain the stability of the package in the studied period. E7 can be considered as a viable alternative for minimally processed mango storage.

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Dental glass ionomer cement reinforced by cellulose microfibers and cellulose nanocrystals

Cited by 70 publications

References 23 publications

Production of biodegradable starch nanocomposites using cellulose nanocrystals extracted from coconut fibers

Production of biodegradable starch nanocomposites using cellulose nanocrystals extracted from coconut fibers

Biocompatibility of a New Dental Glass Ionomer Cement with Cellulose Microfibers and Cellulose Nanocrystals

Development and application starch films: PBAT with additives for evaluating the shelf life of Tommy Atkins mango in the fresh‐cut state

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