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Costa J, Peixoto T, Ferreira A, Vaz F, Lopes MA. Development and characterization of ZnO piezoelectric thin films on polymeric substrates for tissue repair. J Biomed Mater Res A 2019; 107:2150-2159. [PMID: 31094062 DOI: 10.1002/jbm.a.36725] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Accepted: 05/13/2019] [Indexed: 12/18/2022]
Abstract
Currently available scaffolds for tissue repair have shown very limited success, so many efforts have being put in the development of novel functional materials capable of regulating cell behavior and enhance the tissue healing rate. Piezoelectric materials, as zinc oxide (ZnO), can be a very interesting solution for scaffold development, as they can deliver electrical signals to cells upon mechanical solicitation, allowing the development of suitable microenvironments for tissue repair. This way, it is reported the deposition of ZnO thin films on a polymer by direct current magnetron sputtering, under different conditions, in order to obtain a piezoelectric ZnO thin film with potential for tissue repair applications. The obtained ZnO thin films were characterized in terms of morphology, crystallography, electrical conductivity, transmittance, piezoelectricity, and adhesion quality. The deposition process resulted in uniform films, with a very good adhesion to the substrate. The different deposition conditions influenced the evolution of the crystalline domains and preferential growths and consequently, the electrical properties of the films. One of the conditions resulted in a thin film with a high piezoelectric coefficient and a conductor behavior, being considered the most promising to act as a bioactive coating.
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Affiliation(s)
- José Costa
- REQUIMTE/LAQV, Departamento de Engenharia Metalúrgica e de Materiais, Faculdade de Engenharia da Universidade do Porto, Porto, Portugal
| | - Tânia Peixoto
- REQUIMTE/LAQV, Departamento de Engenharia Metalúrgica e de Materiais, Faculdade de Engenharia da Universidade do Porto, Porto, Portugal
| | | | - Filipe Vaz
- Centro de Física, Universidade do Minho, Braga, Portugal
| | - Maria A Lopes
- REQUIMTE/LAQV, Departamento de Engenharia Metalúrgica e de Materiais, Faculdade de Engenharia da Universidade do Porto, Porto, Portugal
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Self-assembled photoadditives in polyester films allow stop and go chemical release. Acta Biomater 2017; 54:186-200. [PMID: 28315815 DOI: 10.1016/j.actbio.2017.03.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 03/04/2017] [Accepted: 03/13/2017] [Indexed: 12/16/2022]
Abstract
Near-infrared (NIR) triggered chemical delivery allows on-demand release with the advantage of external tissue stimulation. Bioresorbable polyester poly-l-lactic acid (PLLA) was compounded with photoadditives of neat zinc oxide (ZnO) nanoparticles and 980→365nm LiYF4:Tm3+, Yb3+ upconverting nanoparticles (UCNP). Subsequently, neat ZnO and UCNP blended PLLA films of sub-50μm thickness were knife casted with a hydrophobic small molecule drug mimic, fluorescein diacetate. The PLLA films displayed a 500 times increase in fluorescein diacetate release from the 50mW NIR irradiated PLLA/photoadditive film compared to non-irradiated PLLA control films. Larger ratios of UCNP/neat ZnO increased photocatalysis efficiency at low NIR duty cycles. The synergistic increase results from the self-assembled photoadditives of neat zinc oxide and upconverting nanoparticles (UCNPs), as seen in transmission electron microscopy. Colloidal ZnO, which does not self-assemble with UCNPs, had less than half the release kinetics of the self-assembled PLLA films under similar conditions, advocating Förster resonance energy transfer as the mechanism responsible for the synergistic increase. Alternative to intensity modulation, pulse width modulation (duty cycles from 0.1 to 1) of the low intensity 50mW NIR laser diode allowed tailorable release rates from 0.01 to 1.4% per day. With the low intensity NIR activation, tailorable release rates, and favorable biocompatibility of the constituents, implanted PLLA photoadditive thin films could allow feedback mediated chemical delivery. STATEMENT OF SIGNIFICANCE Upconverting nanoparticles and zinc oxide nanorods were found to spontaneously self-assemble into submicron particles in organic solvents. Exposure of the submicron particles to near-infrared light allows stop and go chemical release from biocompatible polymers. Sample preparation of thin films is done with ease through physical mixing of the photoadditives followed by air-dried knife casting. A colloidal ZnO variant that does not self-assemble with upconverting nanoparticles had slower chemical release, suggesting that synergistic chemical release is brought upon by highly efficient energy transfer mechanisms when the nanoparticles are less than 10nm apart. Never before seen composite particles of UCNP/ZnO are displayed, which shows the close interaction of the photoadditives within the polymer matrix.
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Kozuszko SN, Sánchez MA, Ferro MIGD, Sfer AM, Madrid APM, Takabatake K, Nakano K, Nagatsuka H, Rodríguez AP. Antibacterial Activity and Biocompability of Zinc Oxide and Graphite Particles as Endodontic Materials. J HARD TISSUE BIOL 2017. [DOI: 10.2485/jhtb.26.311] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Silvia Noemí Kozuszko
- Laboratorio de Medios e Interfases (LAMEIN), Departamento de Bioingeniería, Facultad de Ciencias Exactas y Tecnologías (FACET), Universidad Nacional de Tucumán, Consejo Nacional de Investigaciones Científicas y Técnicas
- Catedra de Anatomía y fisiología Patológicas de la Facultad de Odontología, Universidad Nacional de Tucumán
| | - María Alejandra Sánchez
- Laboratorio de Medios e Interfases (LAMEIN), Departamento de Bioingeniería, Facultad de Ciencias Exactas y Tecnologías (FACET), Universidad Nacional de Tucumán, Consejo Nacional de Investigaciones Científicas y Técnicas
| | | | - Ana María Sfer
- Departamento de Estadística. Facultad de Ciencias Exactas y Tecnología Universidad Nacional de Tucumán
| | - Ana Paula Moreno Madrid
- Laboratorio de Medios e Interfases (LAMEIN), Departamento de Bioingeniería, Facultad de Ciencias Exactas y Tecnologías (FACET), Universidad Nacional de Tucumán, Consejo Nacional de Investigaciones Científicas y Técnicas
| | - Kiyofumi Takabatake
- Department of Oral Pathology and Medicine Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
| | - Keisuke Nakano
- Department of Oral Pathology and Medicine Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
| | - Hitoshi Nagatsuka
- Department of Oral Pathology and Medicine Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
| | - Andrea Paola Rodríguez
- Laboratorio de Medios e Interfases (LAMEIN), Departamento de Bioingeniería, Facultad de Ciencias Exactas y Tecnologías (FACET), Universidad Nacional de Tucumán, Consejo Nacional de Investigaciones Científicas y Técnicas
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Javidi M, Zarei M, Omidi S, Ghorbani A, Gharechahi M, Shayani Rad M. Cytotoxicity of a New Nano Zinc-Oxide Eugenol Sealer on Murine Fibroblasts. IRANIAN ENDODONTIC JOURNAL 2015; 10:231-5. [PMID: 26525834 PMCID: PMC4609659 DOI: 10.7508/iej.2015.04.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Introduction: The aim of this study was to evaluate the cytotoxicity of a new nano zinc-oxide eugenol (NZOE) sealer in comparison with AH-26 and Pulpdent root canal sealers. Methods and Materials: The L929 mouse fibroblast cells were cultivated and incubated for 24, 48 or 72 h with different dilutions (1/1, 1/2, 1/4, 1/8, 1/16 and 1/32) of culture media previously exposed to either of the test sealers naming NZOE, AH-26 or Pulpdent. At the end of incubation period, the effect of sealers on cell viability was evaluated using Mosmann’s Tetrazolium Toxicity (MTT) colorimetric assay. The data was compared using the one-way analysis of variance (ANOVA) followed by the Tukey’s post hoc test for multiple comparisons. Results: After 24, 48 or 72 h, both NZOE and Pulpdent sealers inhibited cell viability at 1/1, 1/2 and 1/8 dilutions. Within the 24 and 48 h, the AH-26 sealer reduced the cell viability at all dilutions except the 1/32 solution; however after 72 h even the 1/32 dilution was cytotoxic. Conclusion: The biocompatibility of the nano zinc-oxide eugenol sealer was comparable to Pulpdent sealer and lower than AH-26.
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Affiliation(s)
- Maryam Javidi
- Dental Material Research Center, Department of Endodontics, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mina Zarei
- Dental Material Research Center, Department of Endodontics, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Salma Omidi
- Department of Endodontics, Dental School, Mazandaran University of Medical Sciences, Sari, Iran
| | - Ahmad Ghorbani
- Pharmacological Research Center of Medicinal Plants, Medical School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maryam Gharechahi
- Dental Material Research Center, Department of Endodontics, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maryam Shayani Rad
- Student Research Committee (SRC), Mashhad University of Medical Sciences, Mashhad, Iran
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Assessment of the genotoxic potential of two zinc oxide sources (amorphous and nanoparticles) using the in vitro micronucleus test and the in vivo wing somatic mutation and recombination test. Food Chem Toxicol 2015; 84:55-63. [DOI: 10.1016/j.fct.2015.07.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 06/24/2015] [Accepted: 07/14/2015] [Indexed: 11/18/2022]
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Melo TAFD, Gründling GSL, Montagner F, Scarparo RK, Figueiredo JAPD, Vier-Pelisser FV. Are bovine teeth a suitable substitute for human teeth in in vitro studies to assess endotoxin load in root canals? Braz Oral Res 2015; 29:S1806-83242015000100282. [PMID: 26154374 DOI: 10.1590/1807-3107bor-2015.vol29.0087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 03/27/2015] [Indexed: 11/22/2022] Open
Abstract
The present study aimed to determine the feasibility of using bovine teeth as a suitable alternative for human teeth, in experiments involving in vitro endotoxin contamination. Twenty bovine central incisors and 20 human single-root premolars had their dental crowns removed and root lengths set at 16 mm. Root canals were prepared up to #60 K-file size and sterilized with cobalt-60 gamma irradiation (20 kGy, 6 h). The teeth were randomly divided into four groups: G1-bovine teeth (bovine negative control, n = 10), G2-human teeth (human negative control, n = 10), G3-bovine teeth, inoculated with Escherichia coli (055:B55) LPS, and G4-human teeth inoculated with E. coli LPS. The G1 and G2 groups were exposed to apyrogenic water. After the teeth had been incubated at 37 °C and atmospheric humidity for 24 h, the samples of solutions in the main canals were collected with apyrogenic absorbent paper tips. LPS levels were quantified using Limulus Amebocyte Lysate assay. The data obtained were statistically analyzed using one-way ANOVA, with a significance level of 5%. A high amount of endotoxin was detected in the inoculated human teeth (G4) when compared to the sterilized teeth (G2), as well as in the inoculated bovine teeth (G3) when compared to the inoculated human teeth (G4). However, there was no statistical difference between bovine teeth before and after the E. coli endotoxin inoculation. Therefore, under the mentioned experimental conditions, the use of bovine teeth should not be a choice for laboratory research on endotoxin contamination.
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Affiliation(s)
- Tiago André Fontoura de Melo
- Clinical Department, Dental School, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | | | - Francisco Montagner
- Endodontics Division, Dental School, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | | | | | - Fabiana Vieira Vier-Pelisser
- Clinical Department, Dental School, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil
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