Journal of Applied Biomaterials & Biomechanics最新文献

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Effects of nonenzymatic glycation on mechanical properties of demineralized bone matrix under compression. 非酶糖基化对压缩下脱矿骨基质力学性能的影响。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-05-01 DOI: 10.5301/JABB.2011.8568
Hanna Trebacz, Artur Zdunek, Wojciech Dys, Tomasz Gieroba, Ewa Wlizlo
{"title":"Effects of nonenzymatic glycation on mechanical properties of demineralized bone matrix under compression.","authors":"Hanna Trebacz,&nbsp;Artur Zdunek,&nbsp;Wojciech Dys,&nbsp;Tomasz Gieroba,&nbsp;Ewa Wlizlo","doi":"10.5301/JABB.2011.8568","DOIUrl":"https://doi.org/10.5301/JABB.2011.8568","url":null,"abstract":"<p><strong>Purpose: </strong>Effects of in vitro induced nonenzymatic glycation of bone collagen on stiffness and fracture of demineralized bone matrix in unconfined compression were investigated.</p><p><strong>Material and methods: </strong>Regular specimens from mid-shaft of bovine femur were grouped in pairs. One sample (R) from each pair was incubated in ribose solution, control samples (C) were incubated in a buffer solution. Samples were then demineralized in formic acid. Demineralized samples were axially compressed to failure (0.033/s). Direction of compression was along the longitudinal axis of femur (L) or perpendicular (transverse) to that (T). Mechanical behavior of demineralized samples was characterized in terms of secant modulus, stress, and strain at fracture and work to failure. The development of damage was examined in terms of acoustic emission (AE) signal recorded during loading.</p><p><strong>Results: </strong>In L direction, strain at fracture following glycation was lower than in the controls (p=0.038); secant modulus and ultimate stress were not significantly different in R and C. In the transverse direction, strain at fracture in R was higher than in C (p=0.053), as well as work to failure (p=0.020). Anisotropy of bone matrix, defined in terms of a ratio of the parameters in two perpendicular directions, decreased markedly in ribosylated samples. Both the number of AE events and cumulative AE energy during deformation were significantly higher in ribosylated samples than in the control for both directions of compression.</p><p><strong>Conclusion: </strong>The study demonstrated that nonenzymatic glycation plays a significant role in modifying organic matrix properties in cortical bone.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 2","pages":"144-9"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.8568","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40137530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Influence of metal ions on human lymphocytes and the generation of titanium-specific T-lymphocytes. 金属离子对人淋巴细胞的影响及钛特异性t淋巴细胞的产生。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-05-01 DOI: 10.5301/JABB.2011.8567
Erwin Chan, Dieter Cadosch, Oliver P Gautschi, Kai Sprengel, Luis Filgueira
{"title":"Influence of metal ions on human lymphocytes and the generation of titanium-specific T-lymphocytes.","authors":"Erwin Chan,&nbsp;Dieter Cadosch,&nbsp;Oliver P Gautschi,&nbsp;Kai Sprengel,&nbsp;Luis Filgueira","doi":"10.5301/JABB.2011.8567","DOIUrl":"https://doi.org/10.5301/JABB.2011.8567","url":null,"abstract":"<p><strong>Background: </strong>There is mounting evidence to suggest the involvement of the immune system by means of activation by metal ions released via biocorrosion, in the pathophysiologic mechanisms of aseptic loosening of orthopedic implants. However, the detailed mechanisms of how metal ions become antigenic and are presented to T-lymphocytes, in addition to how the local inflammatory response is driven, remain to be investigated.</p><p><strong>Methods: </strong>Human T-lymphocytes were cultured in the presence of a variety of metal ions before investigating functional and phenotypic changes using flow cytometric analysis. Additionally, human monocyte-derived dendritic cells (mDC) loaded with metal ions were used as antigen-presenting cells and incubated with naive T-lymphocytes with the aim of generating titanium-specific T-lymphocytes.</p><p><strong>Results: </strong>Using an autologous in vitro model, with mDC treated with Titanium (IV), we were able to induce Titanium (IV)-specific T-lymphocytes. These T-lymphocytes responded in a dose-related manner to Titanium (IV), while they did not cross-react with Titanium (III) or other metal ions, indicating that the new antigenic peptide complexes formed by Titanium (IV) are highly specific.</p><p><strong>Conclusion: </strong>This study showed that mDC exposed to Titanium (IV) are able to induce the generation of Titanium (IV)-specific T-lymphocytes, demonstrating the strong and specific antigenicity of Titanium (IV) ions released by biocorrosion.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 2","pages":"137-43"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.8567","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40137527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 28
Technical features and criteria in designing fiber-reinforced composite materials: from the aerospace and aeronautical field to biomedical applications. 设计纤维增强复合材料的技术特征和标准:从航空航天领域到生物医学应用。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-05-01 DOI: 10.5301/JABB.2011.8569
Antonio Gloria, Dante Ronca, Teresa Russo, Ugo D'Amora, Marianna Chierchia, Roberto De Santis, Luigi Nicolais, Luigi Ambrosio
{"title":"Technical features and criteria in designing fiber-reinforced composite materials: from the aerospace and aeronautical field to biomedical applications.","authors":"Antonio Gloria,&nbsp;Dante Ronca,&nbsp;Teresa Russo,&nbsp;Ugo D'Amora,&nbsp;Marianna Chierchia,&nbsp;Roberto De Santis,&nbsp;Luigi Nicolais,&nbsp;Luigi Ambrosio","doi":"10.5301/JABB.2011.8569","DOIUrl":"https://doi.org/10.5301/JABB.2011.8569","url":null,"abstract":"<p><p>Polymer-based composite materials are ideal for applications where high stiffness-to-weight and strength-to-weight ratios are required. From aerospace and aeronautical field to biomedical applications, fiber-reinforced polymers have replaced metals, thus emerging as an interesting alternative. As widely reported, the mechanical behavior of the composite materials involves investigation on micro- and macro-scale, taking into consideration micromechanics, macromechanics and lamination theory. Clinical situations often require repairing connective tissues and the use of composite materials may be suitable for these applications because of the possibility to design tissue substitutes or implants with the required mechanical properties. Accordingly, this review aims at stressing the importance of fiber-reinforced composite materials to make advanced and biomimetic prostheses with tailored mechanical properties, starting from the basic principle design, technologies, and a brief overview of composites applications in several fields. Fiber-reinforced composite materials for artificial tendons, ligaments, and intervertebral discs, as well as for hip stems and mandible models will be reviewed, highlighting the possibility to mimic the mechanical properties of the soft and hard tissues that they replace.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 2","pages":"151-63"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.8569","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40137531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 56
Rheological properties of cross-linked hyaluronic acid dermal fillers. 交联透明质酸真皮填充剂的流变性能。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-05-01 DOI: 10.5301/JABB.2011.8566
Stefano Santoro, Luisa Russo, Vincenzo Argenzio, Assunta Borzacchiello
{"title":"Rheological properties of cross-linked hyaluronic acid dermal fillers.","authors":"Stefano Santoro,&nbsp;Luisa Russo,&nbsp;Vincenzo Argenzio,&nbsp;Assunta Borzacchiello","doi":"10.5301/JABB.2011.8566","DOIUrl":"https://doi.org/10.5301/JABB.2011.8566","url":null,"abstract":"<p><strong>Aim: </strong>Ha based dermal fillers in recent years aroused big interest in the area of cosmetic surgery for the rejuvenation of the dermis. There is not a ideal dermal filler (DF) for all applications and in commerce there are many types of DF that differ for their chemical-physical properties. So the aim of this paper is to correlate the rheological and physical properties of different DF to their clinical effectiveness.</p><p><strong>Materials and methods: </strong>In this frame the samples have been subjected to oscillation dynamic rheological and steady shear measurements.</p><p><strong>Results: </strong>Our results demonstrate that the viscoelastic properties of different DF varie strongly also considering fillers of the same family. Furthermore it was found that the materials physical properties influence significantly the performance of dermal filler. In particular the clinical data appear to correlate with the concentration of the polymer and with the product between the concentration and the percent elasticity, so these should be crucial parameters for the clinical performance of DF.</p><p><strong>Conclusion: </strong>So rheological data can be a tool to have an indication on the efficacy and longevity of DF but it has to be considered that production technology, in-vivo-conditions, injector skills and experience influence them also significantly.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 2","pages":"127-36"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.8566","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40138208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 46
Trends in biomedical engineering: focus on Regenerative Medicine. 生物医学工程趋势:关注再生医学。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-05-01 DOI: 10.5301/JABB.2011.8562
M Adelaide Asnaghi, Gabriele Candiani, Silvia Farè, Gianfranco B Fiore, Paola Petrini, Manuela T Raimondi, Monica Soncini, Sara Mantero
{"title":"Trends in biomedical engineering: focus on Regenerative Medicine.","authors":"M Adelaide Asnaghi,&nbsp;Gabriele Candiani,&nbsp;Silvia Farè,&nbsp;Gianfranco B Fiore,&nbsp;Paola Petrini,&nbsp;Manuela T Raimondi,&nbsp;Monica Soncini,&nbsp;Sara Mantero","doi":"10.5301/JABB.2011.8562","DOIUrl":"https://doi.org/10.5301/JABB.2011.8562","url":null,"abstract":"<p><p>Regenerative medicine is a critical frontier in biomedical and clinical research. The major progresses in the last few years were driven by a strong clinical need which could benefit from regenerative medicine outcomes for the treatment of a large number of conditions including birth defects, degenerative and neoplastic diseases, and traumatic injuries. Regenerative medicine applies the principles of engineering and life sciences to enhance the comprehension of the fundamental biological mechanisms underlying the structure-function relationships in physiologic and pathologic tissues and to accomplish alternative strategies for developing in vitro biological substitutes which are able to restore, maintain, or improve tissue, and organ function. This paper reviews selected approaches currently being investigated at Politecnico di Milano in the field of regenerative medicine. Specific tissue-oriented topics are divided in three sections according to each developmental stage: in vitro study, pre-clinical study, and clinical application. In vitro studies investigate the basic phenomena related to gene delivery, stem cell behavior, tissue regeneration, and to explore dynamic culture potentiality in different applications: cardiac and skeletal muscle, cartilage, hematopoietic system, peripheral nerve, and gene delivery. Specific fields of regenerative medicine, i.e., bone, blood vessels, and ligaments engineering have already reached the preclinical stage providing promising insights for further research towards clinical applications. The translation of the results obtained during in vitro and preclinical steps into clinical organ replacement is a very challenging issue, which can offer a valid alternative to fight morbidity, organ shortage, and ethical-social problems associated with allotransplantation as shown in the clinical case reported in this review.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 2","pages":"73-86"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.8562","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40138204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
Trends in biomedical engineering: focus on Patient Specific Modeling and Life Support Systems. 生物医学工程的趋势:专注于病人特定的建模和生命支持系统。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-05-01 DOI: 10.5301/JABB.2011.8585
Gabriele Dubini, Davide Ambrosi, Paola Bagnoli, Federica Boschetti, Enrico G Caiani, Claudio Chiastra, Carlo A Conti, Chiara Corsini, Maria Laura Costantino, Carlo D'Angelo, Luca Formaggia, Roberto Fumero, Dario Gastaldi, Francesco Migliavacca, Stefano Morlacchi, Fabio Nobile, Giancarlo Pennati, Lorenza Petrini, Alfio Quarteroni, Alberto Redaelli, Marco Stevanella, Alessandro Veneziani, Christian Vergara, Emiliano Votta, Wei Wu, Paolo Zunino
{"title":"Trends in biomedical engineering: focus on Patient Specific Modeling and Life Support Systems.","authors":"Gabriele Dubini,&nbsp;Davide Ambrosi,&nbsp;Paola Bagnoli,&nbsp;Federica Boschetti,&nbsp;Enrico G Caiani,&nbsp;Claudio Chiastra,&nbsp;Carlo A Conti,&nbsp;Chiara Corsini,&nbsp;Maria Laura Costantino,&nbsp;Carlo D'Angelo,&nbsp;Luca Formaggia,&nbsp;Roberto Fumero,&nbsp;Dario Gastaldi,&nbsp;Francesco Migliavacca,&nbsp;Stefano Morlacchi,&nbsp;Fabio Nobile,&nbsp;Giancarlo Pennati,&nbsp;Lorenza Petrini,&nbsp;Alfio Quarteroni,&nbsp;Alberto Redaelli,&nbsp;Marco Stevanella,&nbsp;Alessandro Veneziani,&nbsp;Christian Vergara,&nbsp;Emiliano Votta,&nbsp;Wei Wu,&nbsp;Paolo Zunino","doi":"10.5301/JABB.2011.8585","DOIUrl":"https://doi.org/10.5301/JABB.2011.8585","url":null,"abstract":"<p><p>Over the last twenty years major advancements have taken place in the design of medical devices and personalized therapies. They have paralleled the impressive evolution of three-dimensional, non invasive, medical imaging techniques and have been continuously fuelled by increasing computing power and the emergence of novel and sophisticated software tools. This paper aims to showcase a number of major contributions to the advancements of modeling of surgical and interventional procedures and to the design of life support systems. The selected examples will span from pediatric cardiac surgery procedures to valve and ventricle repair techniques, from stent design and endovascular procedures to life support systems and innovative ventilation techniques.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 2","pages":"109-17"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.8585","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40138205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Biomechanics of implant-tooth supported prostheses: effects of mesiodistal implant angulation and mode of prosthesis connection. 种植体-牙支撑假体的生物力学:中远端种植体角度和假体连接方式的影响。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-05-01 DOI: 10.5301/JABB.2011.8565
Andaç Barkin Bavbek, Arife Dogan, Murat Cavit Cehreli
{"title":"Biomechanics of implant-tooth supported prostheses: effects of mesiodistal implant angulation and mode of prosthesis connection.","authors":"Andaç Barkin Bavbek,&nbsp;Arife Dogan,&nbsp;Murat Cavit Cehreli","doi":"10.5301/JABB.2011.8565","DOIUrl":"https://doi.org/10.5301/JABB.2011.8565","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this study was to explore the effects of implant angulation and its possible influence on prosthetic connection as regards implant/tooth strains in a combined implant and natural tooth abutment fixed partial denture.</p><p><strong>Methods: </strong>A natural tooth was embedded between vertically-aligned and 17° angulated implants in a polymethyl methacrylate acrylic resin model. Three designs (Group 1: tooth and vertically-aligned implant; Group 2: tooth and 17° angulated implant, Group 3: tooth and vertically-aligned implant having a different prosthetic connection to Group 1) of tooth-implant supported prostheses (n=4) were fabricated. Strain gauges were bonded on the prostheses and on the approximal sides of the natural tooth abutment and implants. Once the test fixed partial dentures were seated, a static load of 150 N was applied to each prosthesis. During testing, strain-gauge signals were digitalized by a data acquisition system and this signal was stored and assessed with corresponding software at a sample rate of 10 KHz.</p><p><strong>Results: </strong>The data were then evaluated using Mann-Whitney U and Kruskal Wallis tests at 95% confidence level. Mesiodistal tilting of implants increased peri-implant strains in implant-tooth supported prostheses during torque-tightening and under load. The mode of prosthesis connection may affect strains within the prosthesis and natural tooth abutments, although its impact under static loading conditions seems negligible.</p><p><strong>Conclusions: </strong>This investigation suggests that mesiodistal tilting of implants may have a biomechanical effect in tooth-implant supported prostheses.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 2","pages":"118-26"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.8565","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40138206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Trends in biomedical engineering: focus on Smart Bio-Materials and Drug Delivery. 生物医学工程的发展趋势:关注智能生物材料和药物输送。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-05-01 DOI: 10.5301/JABB.2011.8563
Maria Cristina Tanzi, Sabrina Bozzini, Gabriele Candiani, Alberto Cigada, Luigi De Nardo, Silvia Farè, Fabio Ganazzoli, Dario Gastaldi, Marinella Levi, Pierangelo Metrangolo, Francesco Migliavacca, Roberto Osellame, Paola Petrini, Giuseppina Raffaini, Giuseppe Resnati, Pasquale Vena, Simone Vesentini, Paolo Zunino
{"title":"Trends in biomedical engineering: focus on Smart Bio-Materials and Drug Delivery.","authors":"Maria Cristina Tanzi,&nbsp;Sabrina Bozzini,&nbsp;Gabriele Candiani,&nbsp;Alberto Cigada,&nbsp;Luigi De Nardo,&nbsp;Silvia Farè,&nbsp;Fabio Ganazzoli,&nbsp;Dario Gastaldi,&nbsp;Marinella Levi,&nbsp;Pierangelo Metrangolo,&nbsp;Francesco Migliavacca,&nbsp;Roberto Osellame,&nbsp;Paola Petrini,&nbsp;Giuseppina Raffaini,&nbsp;Giuseppe Resnati,&nbsp;Pasquale Vena,&nbsp;Simone Vesentini,&nbsp;Paolo Zunino","doi":"10.5301/JABB.2011.8563","DOIUrl":"https://doi.org/10.5301/JABB.2011.8563","url":null,"abstract":"<p><p>The present article reviews on different research lines, namely: drug and gene delivery, surface modification/modeling, design of advanced materials (shape memory polymers and biodegradable stents), presently developed at Politecnico di Milano, Italy. For gene delivery, non-viral polycationic-branched polyethylenimine (b-PEI) polyplexes are coated with pectin, an anionic polysaccharide, to enhance the polyplex stability and decrease b-PEI cytotoxicity. Perfluorinated materials, specifically perfluoroether, and perfluoro-polyether fluids are proposed as ultrasound contrast agents and smart agents for drug delivery. Non-fouling, self-assembled PEG-based monolayers are developed on titanium surfaces with the aim of drastically reducing cariogenic bacteria adhesion on dental implants. Femtosecond laser microfabrication is used for selectively and spatially tuning the wettability of polymeric biomaterials and the effects of femtosecond laser ablation on the surface properties of polymethylmethacrylate are studied. Innovative functionally graded Alumina-Ti coatings for wear resistant articulating surfaces are deposited with PLD and characterized by means of a combined experimental and computational approach. Protein adsorption on biomaterials surfaces with an unlike wettability and surface-modification induced by pre-adsorbed proteins are studied by atomistic computer simulations. A study was performed on the fabrication of porous Shape Memory Polymeric structures and on the assessment of their potential application in minimally invasive surgical procedures. A model of magnesium (alloys) degradation, in a finite element framework analysis, and a bottom-up multiscale analysis for modeling the degradation mechanism of PLA matrices was developed, with the aim of providing valuable tools for the design of bioresorbable stents.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 2","pages":"87-97"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.8563","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40138207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 31
Behavior of aqueous nanocrystalline hydroxyapatite in oral bone regeneration. 纳米羟基磷灰石在口腔骨再生中的作用。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-01-01 DOI: 10.5301/JABB.2011.6450
Davide Zaffe, Giorgio Traversa, Marco Mozzati, Fabrizio Morelli, Giovanni D'Angeli
{"title":"Behavior of aqueous nanocrystalline hydroxyapatite in oral bone regeneration.","authors":"Davide Zaffe,&nbsp;Giorgio Traversa,&nbsp;Marco Mozzati,&nbsp;Fabrizio Morelli,&nbsp;Giovanni D'Angeli","doi":"10.5301/JABB.2011.6450","DOIUrl":"https://doi.org/10.5301/JABB.2011.6450","url":null,"abstract":"<p><strong>Purpose: </strong>A skeletal segment consisting exclusively of bone is the target outcome of bone regeneration. Granular hydroxyapatites form a hydroxyapatite-bone composite, unsuitable for effectively supporting implants, which may persist for many years. This work aimed to investigate the reasons for the bone replacement of Ostim®, a recently commercialized aqueous nanocrystalline hydroxyapatite.</p><p><strong>Methods: </strong>Histology, SEM and X-ray microanalysis were employed to analyze 6- to 9-month biopsies of post-extractive sites or sinus floor lifts of the maxilla in 15 subjects.</p><p><strong>Results: </strong>The results highlight a great bone formation, Ostim® resorption with time by osteoclasts but also interstitial fluid propagation of Ostim® masses by percolation. A possible osteocyte protoplasmic involvement was also at work in concert to reach the target.</p><p><strong>Conclusions: </strong>The use of Ostim® as bone regenerating material leads to the formation of a highly suitable implant support consisting exclusively of bone in less than 12 months, i.e. in a remarkably short time.</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 1","pages":"19-25"},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.6450","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29758663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Manipulating co-continuous polymer blends to create PCL scaffolds with fully interconnected and anisotropic pore architecture. 操纵共连续聚合物共混物以创建具有完全互联和各向异性孔隙结构的PCL支架。
Journal of Applied Biomaterials & Biomechanics Pub Date : 2011-01-01 DOI: 10.5301/JABB.2011.6473
Vincenzo Guarino, Angela Guaccio, Luigi Ambrosio
{"title":"Manipulating co-continuous polymer blends to create PCL scaffolds with fully interconnected and anisotropic pore architecture.","authors":"Vincenzo Guarino,&nbsp;Angela Guaccio,&nbsp;Luigi Ambrosio","doi":"10.5301/JABB.2011.6473","DOIUrl":"https://doi.org/10.5301/JABB.2011.6473","url":null,"abstract":"<p><strong>Purpose: </strong>Polymer blending is an attractive route to obtain new materials with superior properties. Control of their characteristics may be initially achieved by manipulating the phase morphology with different aspects (i.e, lamellar, dispersed or fibrillar) to form tailored architectures for different application fields. In particular, co-continuous microstructures due to the interpenetration of two different polymer phases in three dimensions are particularly interesting because they are able to offer a fully interconnected network with improvement of mechanical properties and fluid permeability for tissue engineering applications.</p><p><strong>Materials and methods: </strong>Macro/microporous substrates with controlled architecture were obtained by blending hydrophylic and hydrophobic polymers, i.e, polycaprolactone (PCL) and poly(ethylene oxide)(PEO) respectively, in a co-continuous state by a twin-screw extruder.</p><p><strong>Results: </strong>In accordance with the leaching-based approaches traditionally used in scaffold manufacturing, the removal of water soluble phases (i.e., PEO and sodium chloride (NaCl) crystals) enables a fully interconnected porous network to be formed, whereas post-extrusion stretching of the melt blend allows a desired elongation of polymer phases to be imparted before the polymer leaching, thus providing a controlled pore alignment.</p><p><strong>Conclusion: </strong>the proposed investigation confirms that polymer blending is a promising approach to realize structurally organized platforms able to guide the regeneration processes of hierarchically organized tissues (i.e, tendons, muscles, ligaments and nerves).</p>","PeriodicalId":51074,"journal":{"name":"Journal of Applied Biomaterials & Biomechanics","volume":"9 1","pages":"34-9"},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5301/JABB.2011.6473","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29776878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
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