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Insights into Functional Tetracycline/Antioxidant Containing Chitosan Hydrogels as Potential Bio-Active Restorative Materials: Structure, Function and Antimicrobial Activity

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Open Journal of Stomatology 2014年第3期4卷 99-108页

作者： Victoria Tamara Perchyonok shengmiao zhang Nicki Basson Sias Grobler Theunis Oberholzer Ward Massey Oral and Dental Research Institute Faculty of Dentistry University of the Western Cape Cape Town South Africa School of Dentistry and Oral Health Griffith University Gold Coast Australia School of Material Science and Engineering East China University of Science and Technology Shanghai China

The human inflammatory periodontal diseases are amongst the most common of chronic diseases to affect adults. Periodontitis is regarded as “an inflammatory lesion, mediated by complex host-parasite interactions, that leads to the loss of connective tissue attachment to root surface cementum and adjacent alveolar bone”. Substantial data are available in the literature on the role of reactive oxygen species (ROS) and antioxidants in disorders such as the inflammatory diseases. However, remarkably little information is available on the periodontal diseases, which show many of the pathological features of other chronic inflammatory diseases. The periodontal tissues also provide an ideal medium within which to study mechanisms of ROS mediated tissue damage and of antioxidant defense in response to bacterial colonisation, through the non-invasive collection of GCF. The objectives of this study are to evaluate the novel chitosan based functional drug delivery systems which can be successfully incorporated into “dual action bioactive restorative materials” containing common antibiotics such as tetracycline, krill oil, aloe and aspirin as commonly used antioxidant species. Methods: The novel hydrogels will be investigated with respect to the antioxidant capacity and drug release capacity of the tetracycline from the designer drug delivery system, the use of SEM imaging for the characterization of the surfaces and reactive features of novel materials with antimicrobial potential. Results: A steady slow release of tetracycline, while maintaining antibiotic effects against the tested bacteria, for at least 10 days was shown from designer chitosan-antioxidant hydrogels. Within the limitations of the study design chitosan-antioxidant hydrogels are suitable materials for functional restorative and periodontal applications in vitro. The addition of antioxidants to the tetracycline containing prototype delivery system had a beneficial effect on the design of the hydrogel by slowing

关键词： Chitosan Hydrogels Tetracycline Reactive Oxygen Species Antioxidants Functional Biomaterials

Bio-Functional Nanodiamond Restorative Materials Containing Bio-Additives: In Vitro Approach

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Open Journal of Stomatology 2015年第5期5卷 117-126页

作者： Victoria Tamara Perchyonok Tatiana Souza Rafael Felliti shengmiao zhang Sias Grobler VTPCHEM PTY LTD Southport Australia S3 Logan Australia Colonia 1181 apt 302 Montevideo Uruguay School of Material Science and Engineering East China University of Science and Technology Shanghai China Oral and Dental Research Institute Faculty of Dentistry University of the Western Cape Cape Town South Africa

Restorative materials in the new era aim to be “bio-active”, bio-functional and long-lasting. As a part of our continuous interest of developing functional dual action restorative materials capable of being “bio-active” functional restorative materials, we designed and evaluated several novel nano-diamond:chitosan containing hydrogels as a prototype of molecular scaffold materials capable of free radical defense action containing propolis extract (antioxidant containing material) from 3 different regions namely, Green Brazilian Propolis, Uruguan Propolis and Australian Propolis. We evaluated the physical properties, bonding to dentin as well as test the bioadhesion of the newly designed materials in order to access the suitability of these prototype materials as suitable restorative materials, evaluated total phenol capacity of the materials as well as free radical defense capacity using BSA protein model as a quick and effective in vitro model. The hydrogels were prepared as previously reported by our protocol. The physico-chemical features including surface morphology (SEM), release behaviors, stability of the antioxidant-chitosan-nanodiamond and the effect of the hydrogels on the shear bond strength of dentin were measured. Structural investigations of the reactive surface of the hydrogel are reported. Bio-adhesive studies were performed in order to assess the suitability of these designer materials. Free radical defence and performance of the materials was evaluated using BSA and Folin Ciocalteu assay. Results: Within the limitations of the study design chitosan-antioxidant hydrogels are suitable materials for functional restorative and periodontal applications in vitro. The addition of propolis extracts nano-diamond chitosan prototype delivery system had a beneficial effect on the design of the hydrogel by increasing bioadhesive properties of the newly prepared hydrogels, increasing free radical defense properties of the biomaterials as well as increasing the d

关键词： Therapeutic Polymers Adhesives Chitosan Hydrogels Propolis Melatonin Naproxen Antimicrobial Dentin Bonding Antioxidants Bioactive

Insights into chitosan hydrogels on dentine bond strength and cytotoxicity

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Open Journal of Stomatology 2013年第1期3卷 75-82页

作者： V. Tamara Perchyonok Sias Grobler shengmiao zhang Annette Olivier Theunis Oberholzer Oral and Dental Research Institute Faculty of Dentistry University of the Western Cape Cape Town South Africa School of Dentistry and Oral Health Griffith University Gold Coast Australia School of Material Science and Engineering East China University of Science and Technology Shanghai China VTPChem PTY Ltd. Melbourne Australia

Contemporary dental adhesives show favorable immediate results in terms of bonding effectiveness. However, the durability of resin-dentin bonds is their major problem. Materials and Methods: Preparation of 3 chitosan-antioxidant hydrogels was achieved using modified hydrogel preparation method. Their effect on the bond strength to dentine both short term (after 24 hours) and long term (after 6 months) were evaluated using shear bond strength measurements using Instron Universal Testing Mascine). The SEM was used to study the surface of the hydrogels. The cell survival rate (cytotoxicity) of the antioxidants resveratrol, β-carotene and propolis towards Balb/c 3T3 mouse fibroblast cells was also assessed using the standard MTT assay. Results: It was found that chitosan-H treated dentine gives significantly (p β-carotene (92%) > propolis (68%) > resveratrol (33%). Conclusion: the antioxidant-chitosan hydrogels significantly improved bonding to dentine with or without phosphoric acid treatment. The pH of the growth medium had a high influence on the cell survival rate of Balb/c mouse 3T3 fibroblast cells. The release of the antioxidant β-carotene would not have an influence on the pulp cells. These materials might address the current perspectives for improving bond durability.

关键词： Antioxidant-Chitosan Hydrogels SEM Bond Strength Cytotoxicity Mouse 3T3 Fibroblast Fibroblast

Insights into chitosan based gels as functional restorative biomaterials prototypes: In vitroapproach

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Open Journal of Stomatology 2013年第9期3卷 22-30页

作者： Victoria Tamara Perchyonok shengmiao zhang Nicolaas J. Basson Sias Grobler Theunis Oberholzer Ward Massey Oral and Dental Research Institute Faculty of Dentistry University of the Western Cape Cape Town South Africa School of Dentistry and Oral Health Griffith University Gold Coast Australia School of Material Science and Engineering East China University of Science and Technology Shanghai China

Restorative materials in the new era aim to be “bioactive” and long-lasting. The purpose of the study was to design and evaluate novel chitosan hydrogels containing melatonin and/or propolis (antioxidant containing material), nystatin (antifungal), naproxen (pain relieve medication) and combinations thereof (chitosan-H-melatonin, chitosan-H-melatonin-naproxen, chitosan-H-propolis, chitosan-H-propolisnaproxen, chitosan-H-naproxen-propolis-melatonin, Chitosan/Propolis/Nystatin, Chitosan/Melatonin/Propolis/Nystatin, Chitosan/Propolis/BSA/Nystatin, Chitosan/Melatonin/BSA/Nystatin) as functional additive prototypes for further development of “dual function restorative materials”, to determine their effect on the dentin bond strength of a composite, to evaluate stability of the encapsulated antioxidants as well as evaluate antimicrobial properties of the selected group of “designer” functional materials. Materials and Methods: The above mentioned hydrogels were prepared by dispersion of the corresponding component in glycerol and acetic acid with the addition of chitosan gelling agent. The surface morphology (SEM), drug-polymer solid state interaction (FT-IR spectroscopy), released behaviours (physiological pH and also in acidic conditions), stability of the therapeutic agent-antioxidant-chitosan and the effect of the hydrogels on the shear bond strength of dentin were also evaluated. Results: The release of naproxen confers the added benefit of synergistic action of a functional therapeutic delivery when comparing the newly designed chitosan-based hydrogel restorative materials to the commercially available products alone. Neither the release of naproxen or the antioxidant stability was affected by storage over a 6-month period. The hydrogel formulations have a uniform distribution of drug content, homogenous texture and yellow colour (SEM study). All chitosan dentin treated hydrogels gave significantly

关键词： Therapeutic Polymers Adhesives Chitosan Hydrogels Propolis Melatonin Naproxen Antimicrobial Dentin Bonding Antioxidants Bioactive

Bioinspired-Interpenetrating Network (IPNs) Hydrogel (BIOF-INPs) and TMD in Vitro: Bioadhesion, Drug Release and Build in Free Radical Detection and Defense

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Open Journal of Stomatology 2015年第3期5卷 53-61页

作者： Victoria Tamara Perchyonok Vanessa Reher Nicolaas J. Basson shengmiao zhang Sias R. Grobler VTPCHEM PTY LTD Gold Coast Australia School of Dentistry and Oral Health Griffith University Gold Coast Australia Oral and Dental Research Institute Faculty of Dentistry University of the Western Cape Cape Town South Africa School of Material Science and Engineering East China University of Science and Technology Shanghai China

In this work, Bioactive-functionalized interpenetrating network (IPNs) hydrogel (BIOF-INPs) were prepared and investigated in vitro for the free radical detection/defense, therapeutic release as well as shear bond strength to dentine, ability to re-mineralize surface of the dentin after application of these bio-inspired materials using a biologically inspired mineralization process in vitro as well as investigating antimicrobial properties of the BIOF-INPs against S. aureous. The aim of this investigation was to evaluate the suitability and flexibility of the designer materials to act as an “in vitro” probe to gain insights into molecular origin of TMD and associated disorders.

关键词： TMD Functionalized IPNs Bio-Adhesion Drug Release Build in Free Radical Detection and Defense

Chitosan:Vitamin C Containing Hydrogels as a Prototype Functional Prolonged Pain Management Restorative Material In-VitroStudies

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Open Journal of Stomatology 2014年第8期4卷 389-401页

作者： V. Tamara Perchyonok Vanessa Reher shengmiao zhang Theunis Oberholzer Ward Massey Sias R. Grobler Oral and Dental Research Institute Faculty of Dentistry University of the Western Cape Cape Town South Africa School of Dentistry and Oral Health Griffith University Parkwood Australia School of Material Science and Engineering East China University of Science and Technology Shanghai China VTPCHEM PTY LTD Gold Coast Australia

Restorative materials in the new era aim to be “bio-active” and long-lasting. As a part of our continuous interest of developing functional dual action restorative materials capable of being “bio-active” and wound healing, we design and evaluate several novel chitosan-vitamin C (5:1) containing hydrogels as a prototype of host:guest molecular free radical defense material containing hydroethanoic propolis extract (antioxidant containing material), naproxen, ibuprofen (non steroidal anti-inflammatory medication), or aspirin (pain relieve medication and free radical scavengers) as functional restorative materials. We will evaluate the physical properties, bonding to dentin as well as test the bioadhesion of the newly designed materials in order to access the suitability of these prototype materials as suitable restorative materials. Materials and Methods: The hydrogels were prepared by previously reported by us protocol. The physico-chemical features including surface morphology (SEM), release behaviors, stability of the therapeutic agent-anti-oxidant-chitosan and the effect of the hydrogels on the shear bond strength of dentin were measured and compared to the earlier reported chitosan-antioxidant containing hydrogels. Structural investigations of the reactive surface of the hydrogel were reported. Bio-adhesive studies were performed in order to assess the suitability of these designed materials. Results: Release of aspirin, ibuprofen and naproxen conferred the added benefit of synergistic action of a functional therapeutic delivery when comparing the newly designed chitosan-based hydrogel restorative materials to the commercially available products alone. Either the release of therapeutic agents or the antioxidant stability was affected by storage over a 12-month period. All chitosan:vitamin C hydrogels showed gave significantly higher shear bond values than dentin treated or not treated with phosphoric acid, which highlighted the feasibility. The bio-adhesive capac

关键词： Therapeutic Polymers Adhesives Chitosan Hydrogels Propolis Dentin Bonding Antioxidants Bioactive and Bioadhesive

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基于稀疏恢复谱相似度的自适应样本筛选算法

系统工程与电子技术 2018年第5期40卷 976-981页

作者：王晓明李军张圣鹋卢燕张永杰电子科技大学电子工程学院四川成都611731 毫米波遥感技术重点实验室北京100854

非均匀环境下的空时自适应处理算法需对参考单元样本进行筛选。针对小系统自由度下,已有的基于傅里叶谱相似度(Fourier spectral similarity,FSPS)的筛选算法在污染样本剔除以及相似样本选择环节都存在分辨率不足的问题,提出一种基于稀... 详细信息

非均匀环境下的空时自适应处理算法需对参考单元样本进行筛选。针对小系统自由度下,已有的基于傅里叶谱相似度(Fourier spectral similarity,FSPS)的筛选算法在污染样本剔除以及相似样本选择环节都存在分辨率不足的问题,提出一种基于稀疏恢复技术的自适应样本筛选算法。该方法利用参考单元样本及待检测单元(cell under test,CUT)样本的高精度稀疏恢复谱筛选出与CUT杂波特征相近的样本,保留了FSPS算法在非均匀杂波环境下的鲁棒性,同时提升对非均匀样本的分辨精度。仿真结果表明,所提算法在小系统自由度情况下具有优于FSPS算法的样本筛选效果及系统输出性能。

关键词：空时自适应处理稀疏恢复样本筛选协方差矩阵估计

Insights and relative effect of aspirin, naproxen and ibuprofen containing hydrogels: From design to performance as a functional dual capacity restorative material and build in free radical defense: In-vitrostudies

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Open Journal of Stomatology 2014年第2期4卷 73-83页

作者： Victoria Tamara Perchyonok Vanessa Reher shengmiao zhang Sias R. Grobler Theunis G. Oberholzer Ward Massey Oral and Dental Research Institute Faculty of Dentistry University of the Western Cape Cape Town South Africa School of Dentistry and Oral Health Griffith University Southport Australia School of Material Science and Engineering East China University of Science and Technology Shanghai China

Restorative materials in the new era aim to be “bio-active” and long-lasting. It has been suggested that the anti-inflammatory activity of some non-steroidal anti-inflammatory drugs (NSAIDs) may be partly due to their ability to scavenge reactive oxygen species (ROS) and reactive nitrogen species (RNS), as well as to inhibit the respiratory burst of neutrophils triggered by various activating agents. As a part of our continuous interest of developing functional dual action restorative materials capable of being “bio-active” and long-lasting, we design and evaluate novel chitosan hydrogels containing krill oil (antioxidant containing material), naproxen, ibuprofen (non steroidal anti-inflammatory medication), aspirin (pain relieve medication and free radical scavengers) and combinations thereof (chitosan-H-krill oil, chitosan-H-krill oil-aspirin and chitosan-H-naproxen, chitosan-H-naproxen-krill oil, chitosan-H-krill oil-ibuprofen and chitosan-H-ibuprofen) as functional additive prototypes for further development of “dual function restorative materials”;secondly, determine their effect on the dentin bond strength of a composite and thirdly, evaluate the capability of newly designed hydrogels to play an integral role of “build in” free radical defense mechanism by using BSA solubility as a “molecular prototype” of the site of free radical attack in vitro. Materials and Methods: The above mentioned hydrogels were prepared by dispersion of the corresponding component in glycerol and acetic acid with the addition of chitosan gelling agent. The surface morphology (SEM), release behaviors (physiological pH and also in acidic conditions), stability of the therapeutic agent-antioxidant-chitosan and the effect of the hydrogels on the shear bond strength of dentin were also evaluated. Results: The release of aspirin, ibuprofen and naproxen confers the added benefit of synergistic action of a functional therapeutic delivery when comparing the newly designed chitosan-based hydro

关键词： Therapeutic Polymers Adhesives Chitosan Hydrogels Asprin Ibuprofen Naproxen Dentin Bonding Antioxidants Bioactive

Indenoisoquinoline derivatives as topoisomerase I inhibitors that suppress angiogenesis by affecting the HIF signaling pathway

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Indenoisoquinoline derivatives as topoisomerase I inhibitors...