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Salehi Abar E, Vandghanooni S, Torab A, Jaymand M, Eskandani M. A comprehensive review on nanocomposite biomaterials based on gelatin for bone tissue engineering. Int J Biol Macromol 2024; 254:127556. [PMID: 37884249 DOI: 10.1016/j.ijbiomac.2023.127556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 10/09/2023] [Accepted: 10/18/2023] [Indexed: 10/28/2023]
Abstract
The creation of a suitable scaffold is a crucial step in the process of bone tissue engineering (BTE). The scaffold, acting as an artificial extracellular matrix, plays a significant role in determining the fate of cells by affecting their proliferation and differentiation in BTE. Therefore, careful consideration should be given to the fabrication approach and materials used for scaffold preparation. Natural polypeptides such as gelatin and collagen have been widely used for this purpose. The unique properties of nanoparticles, which vary depending on their size, charge, and physicochemical properties, have demonstrated potential in solving various challenges encountered in BTE. Therefore, nanocomposite biomaterials consisting of polymers and nanoparticles have been extensively used for BTE. Gelatin has also been utilized in combination with other nanomaterials to apply for this purpose. Composites of gelatin with various types of nanoparticles are particularly promising for creating scaffolds with superior biological and physicochemical properties. This review explores the use of nanocomposite biomaterials based on gelatin and various types of nanoparticles together for applications in bone tissue engineering.
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Affiliation(s)
- Elaheh Salehi Abar
- Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran; Research Center for Pharmaceutical Nanotechnology, Biomedicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Somayeh Vandghanooni
- Hematology and Oncology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ali Torab
- Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mehdi Jaymand
- Nano Drug Delivery Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran; Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Morteza Eskandani
- Research Center for Pharmaceutical Nanotechnology, Biomedicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran.
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Cho YD, Kim KH, Lee YM, Ku Y, Seol YJ. Dental-derived cells for regenerative medicine: stem cells, cell reprogramming, and transdifferentiation. J Periodontal Implant Sci 2022; 52:437-454. [PMID: 36468465 PMCID: PMC9807848 DOI: 10.5051/jpis.2103760188] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 12/08/2021] [Accepted: 01/24/2022] [Indexed: 01/07/2023] Open
Abstract
Embryonic stem cells have been a popular research topic in regenerative medicine owing to their pluripotency and applicability. However, due to the difficulty in harvesting them and their low yield efficiency, advanced cell reprogramming technology has been introduced as an alternative. Dental stem cells have entered the spotlight due to their regenerative potential and their ability to be obtained from biological waste generated after dental treatment. Cell reprogramming, a process of reverting mature somatic cells into stem cells, and transdifferentiation, a direct conversion between different cell types without induction of a pluripotent state, have helped overcome the shortcomings of stem cells and raised interest in their regenerative potential. Furthermore, the potential of these cells to return to their original cell types due to their epigenetic memory has reinforced the need to control the epigenetic background for successful management of cellular differentiation. Herein, we discuss all available sources of dental stem cells, the procedures used to obtain these cells, and their ability to differentiate into the desired cells. We also introduce the concepts of cell reprogramming and transdifferentiation in terms of genetics and epigenetics, including DNA methylation, histone modification, and non-coding RNA. Finally, we discuss a novel therapeutic avenue for using dental-derived cells as stem cells, and explain cell reprogramming and transdifferentiation, which are used in regenerative medicine and tissue engineering.
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Affiliation(s)
- Young-Dan Cho
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University and Seoul National University Dental Hospital, Seoul, Korea
| | - Kyoung-Hwa Kim
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University and Seoul National University Dental Hospital, Seoul, Korea
| | - Yong-Moo Lee
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University and Seoul National University Dental Hospital, Seoul, Korea
| | - Young Ku
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University and Seoul National University Dental Hospital, Seoul, Korea
| | - Yang-Jo Seol
- Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University and Seoul National University Dental Hospital, Seoul, Korea
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Polverini PJ, Krebsbach PH. Research and Discovery Science and the Future of Dental Education and Practice. J Dent Educ 2017; 81:eS97-eS107. [PMID: 28864810 DOI: 10.21815/jde.017.040] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Accepted: 03/09/2017] [Indexed: 01/02/2023]
Abstract
Dental graduates of 2040 will face new and complex challenges. If they are to meet these challenges, dental schools must develop a research and discovery mission that will equip graduates with the new knowledge required to function in a modern health care environment. The dental practitioner of 2040 will place greater emphasis on risk assessment, disease prevention, and health maintenance; and the emerging discipline of precision medicine and systems biology will revolutionize disease diagnosis and reveal new targeted therapies. The dental graduate of 2040 will be expected to function effectively in a collaborative, learning health care system and to understand the impact of health care policy on local, national, and global communities. Emerging scientific fields such as big data analytics, stem cell biology, tissue engineering, and advanced biomimetics will impact dental practice. Despite all the warning signs indicating how the changing scientific and heath care landscape will dramatically alter dental education and dental practice, dental schools have yet to reconsider their research and educational priorities and clinical practice objectives. Until dental schools and the practicing community come to grips with these challenges, this persistent attitude of complacency will likely be at the dental profession's peril. This article was written as part of the project "Advancing Dental Education in the 21st Century."
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Affiliation(s)
- Peter J Polverini
- Dr. Polverini is Jonathan Taft Distinguished University Professor of Dentistry, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry and Professor, Department of Pathology, University of Michigan Medical School; and Dr. Krebsbach is Dean and Professor, University of California, Los Angeles, School of Dentistry.
| | - Paul H Krebsbach
- Dr. Polverini is Jonathan Taft Distinguished University Professor of Dentistry, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry and Professor, Department of Pathology, University of Michigan Medical School; and Dr. Krebsbach is Dean and Professor, University of California, Los Angeles, School of Dentistry
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Polverini PJ. Oral Health Research and Scholarship in 2040: Executive Summary. J Dent Educ 2017; 81:1137-1143. [PMID: 28864797 DOI: 10.21815/jde.017.070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Accepted: 03/02/2017] [Indexed: 12/25/2022]
Abstract
This executive summary for Section 6 of the "Advancing Dental Education in the 21st Century" project provides an overview of five background articles that address the role of research and scholarship in dental education in the year 2040. Beginning with a historical account of research and discovery science in dentistry's evolution as a profession, the article then reviews the role of early thought leaders and organized dentistry in establishing research as a cornerstone of dental education and dental practice. The dental research workforce faces an uncertain future fueled by a volatile funding environment and inadequate mentoring and training of research faculty. Dental schools must forge stronger academic and scientific ties to their university and academic health centers and will be challenged to develop sustainable research and patient care collaborations with other health professions. The changing health care environment will create new opportunities for oral health care providers to expand their scope of practice and focus on prevention and screening for non-communicable chronic diseases. Dental practitioners in the future are likely to place greater emphasis on managing the overall health of their patients while promoting closer integration with other health professionals. All dental schools must develop a sustainable research mission if they hope to graduate dentists who function effectively in a collaborative health care environment. The changing scientific and health care landscape will dramatically alter dental education and dental practice. Dental schools need to reconsider their research and educational priorities and clinical practice objectives. Until dental schools and the practicing community come to grips with these challenges, a persistent attitude of complacency will likely be at the dental profession's peril.
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Affiliation(s)
- Peter J Polverini
- Dr. Polverini is Jonathan Taft Distinguished University Professor of Dentistry, Department of Periodontics and Oral Medicine, School of Dentistry, and Professor of Pathology, Medical School, University of Michigan.
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ATALAYIN C, TEZEL H, DAGCI T, Karabay YAVASOGLU NU, OKTEM G. Medium modification with bone morphogenetic protein 2 addition for odontogenic differentiation. Braz Oral Res 2016; 30:S1806-83242016000100223. [DOI: 10.1590/1807-3107bor-2016.vol30.0020] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 11/09/2015] [Indexed: 01/09/2023] Open
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Abstract
Navigation technology is applied successfully in oral and maxillofacial surgery. Laser beams are used for caries removal. With nanodentistry, it is possible to maintain comprehensive oral health care. Nanorobots induce oral analgesia, desensitize teeth, and manipulate the tissue. They can also be used for preventive, restorative, and curative procedures. Strategies to engineer tissue can be categorized into 3 major classes: conductive, inductive, and cell transplantation approaches. Several populations of cells with stem cell properties have been isolated from different parts of the tooth.
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Affiliation(s)
- Roya Zandparsa
- Tufts University School of Dentistry, Postgraduate Prosthodontics Division, 1 Kneeland Street, Boston, MA 02111, USA.
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Oerlemans AJM, van Hoek MEC, van Leeuwen E, van der Burg S, Dekkers WJM. Towards a richer debate on tissue engineering: a consideration on the basis of NEST-ethics. SCIENCE AND ENGINEERING ETHICS 2013; 19:963-81. [PMID: 23229374 DOI: 10.1007/s11948-012-9419-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 11/06/2012] [Indexed: 05/04/2023]
Abstract
In their 2007 paper, Swierstra and Rip identify characteristic tropes and patterns of moral argumentation in the debate about the ethics of new and emerging science and technologies (or "NEST-ethics"). Taking their NEST-ethics structure as a starting point, we considered the debate about tissue engineering (TE), and argue what aspects we think ought to be a part of a rich and high-quality debate of TE. The debate surrounding TE seems to be predominantly a debate among experts. When considering the NEST-ethics arguments that deal directly with technology, we can generally conclude that consequentialist arguments are by far the most prominently featured in discussions of TE. In addition, many papers discuss principles, rights and duties relevant to aspects of TE, both in a positive and in a critical sense. Justice arguments are only sporadically made, some "good life" arguments are used, others less so (such as the explicit articulation of perceived limits, or the technology as a technological fix for a social problem). Missing topics in the discussion, at least from the perspective of NEST-ethics, are second "level" arguments-those referring to techno-moral change connected to tissue engineering. Currently, the discussion about tissue engineering mostly focuses on its so-called "hard impacts"-quantifiable risks and benefits of the technology. Its "soft impacts"-effects that cannot easily be quantified, such as changes to experience, habits and perceptions, should receive more attention.
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Affiliation(s)
- A J M Oerlemans
- Scientific Institute for Quality of Healthcare, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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8
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Schricker SR, Palacio MLB, Bhushan B. Designing nanostructured block copolymer surfaces to control protein adhesion. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2012; 370:2348-2380. [PMID: 22509062 PMCID: PMC7398454 DOI: 10.1098/rsta.2011.0484] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The profile and conformation of proteins that are adsorbed onto a polymeric biomaterial surface have a profound effect on its in vivo performance. Cells and tissue recognize the protein layer rather than directly interact with the surface. The chemistry and morphology of a polymer surface will govern the protein behaviour. So, by controlling the polymer surface, the biocompatibility can be regulated. Nanoscale surface features are known to affect the protein behaviour, and in this overview the nanostructure of self-assembled block copolymers will be harnessed to control protein behaviour. The nanostructure of a block copolymer can be controlled by manipulating the chemistry and arrangement of the blocks. Random, A-B and A-B-A block copolymers composed of methyl methacrylate copolymerized with either acrylic acid or 2-hydroxyethyl methacrylate will be explored. Using atomic force microscopy (AFM), the surface morphology of these block copolymers will be characterized. Further, AFM tips functionalized with proteins will measure the adhesion of that particular protein to polymer surfaces. In this manner, the influence of block copolymer morphology on protein adhesion can be measured. AFM tips functionalized with antibodies to fibronectin will determine how the surfaces will affect the conformation of fibronectin, an important parameter in evaluating surface biocompatibility.
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Affiliation(s)
- Scott R Schricker
- Restorative and Prosthetic Dentistry Section, College of Dentistry, Ohio State University, Columbus, 43210, USA.
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Lotfi G, Shokrgozar MA, Mofid R, Abbas FM, Ghanavati F, Bagheban AA, Shariati RP. A Clinical and Histologic Evaluation of Gingival Fibroblasts Seeding on a Chitosan-Based Scaffold and Its Effect on the Width of Keratinized Gingiva in Dogs. J Periodontol 2011; 82:1367-75. [DOI: 10.1902/jop.2011.100604] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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10
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Pashley DH, Tay FR, Breschi L, Tjäderhane L, Carvalho RM, Carrilho M, Tezvergil-Mutluay A. State of the art etch-and-rinse adhesives. Dent Mater 2010; 27:1-16. [PMID: 21112620 DOI: 10.1016/j.dental.2010.10.016] [Citation(s) in RCA: 593] [Impact Index Per Article: 42.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Accepted: 10/22/2010] [Indexed: 11/18/2022]
Abstract
OBJECTIVES The aim of this study was to explore the therapeutic opportunities of each step of 3-step etch-and-rinse adhesives. METHODS Etch-and-rinse adhesive systems are the oldest of the multi-generation evolution of resin bonding systems. In the 3-step version, they involve acid-etching, priming and application of a separate adhesive. Each step can accomplish multiple goals. Acid-etching, using 32-37% phosphoric acid (pH 0.1-0.4) not only simultaneously etches enamel and dentin, but the low pH kills many residual bacteria. RESULTS Some etchants include anti-microbial compounds such as benzalkonium chloride that also inhibits matrix metalloproteinases (MMPs) in dentin. Primers are usually water and HEMA-rich solutions that ensure complete expansion of the collagen fibril meshwork and wet the collagen with hydrophilic monomers. However, water alone can re-expand dried dentin and can also serve as a vehicle for protease inhibitors or protein cross-linking agents that may increase the durability of resin-dentin bonds. In the future, ethanol or other water-free solvents may serve as dehydrating primers that may also contain antibacterial quaternary ammonium methacrylates to inhibit dentin MMPs and increase the durability of resin-dentin bonds. The complete evaporation of solvents is nearly impossible. SIGNIFICANCE Manufacturers may need to optimize solvent concentrations. Solvent-free adhesives can seal resin-dentin interfaces with hydrophobic resins that may also contain fluoride and antimicrobial compounds. Etch-and-rinse adhesives produce higher resin-dentin bonds that are more durable than most 1 and 2-step adhesives. Incorporation of protease inhibitors in etchants and/or cross-linking agents in primers may increase the durability of resin-dentin bonds. The therapeutic potential of etch-and-rinse adhesives has yet to be fully exploited.
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Affiliation(s)
- David H Pashley
- Department of Oral Biology, Medical College of Georgia, School of Dentistry, Augusta, GA, USA.
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de Vries RBM, Oerlemans A, Trommelmans L, Dierickx K, Gordijn B. Ethical aspects of tissue engineering: a review. TISSUE ENGINEERING PART B-REVIEWS 2009; 14:367-75. [PMID: 18834330 DOI: 10.1089/ten.teb.2008.0199] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Tissue engineering (TE) is a promising new field of medical technology. However, like other new technologies, it is not free of ethical challenges. Identifying these ethical questions at an early stage is not only part of science's responsibility toward society, but also in the interest of the field itself. In this review, we map which ethical issues related to TE have already been documented in the scientific literature. The issues that turn out to dominate the debate are the use of human embryonic stem cells and therapeutic cloning. Nevertheless, a variety of other ethical aspects are mentioned, which relate to different phases in the development of the field. In addition, we discuss a number of ethical issues that have not yet been raised in the literature.
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Affiliation(s)
- Rob B M de Vries
- Section Ethics, Philosophy, and History of Medicine, Scientific Institute for Quality of Healthcare, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Trommelmans L, Selling J, Dierickx K. An Exploratory Survey on the Views of European Tissue Engineers Concerning the Ethical Issues of Tissue Engineering Research. TISSUE ENGINEERING PART B-REVIEWS 2009; 15:241-7. [DOI: 10.1089/ten.teb.2008.0647] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Leen Trommelmans
- Faculty of Medicine, Centre for Biomedical Ethics and Law, Catholic University of Leuven, Leuven, Belgium
| | - Joseph Selling
- Faculty of Theology, Research Unit Theological Ethics, Catholic University of Leuven, Leuven, Belgium
| | - Kris Dierickx
- Faculty of Medicine, Centre for Biomedical Ethics and Law, Catholic University of Leuven, Leuven, Belgium
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Peretz H, Blinder P, Baranes D, Vago R. Aragonite crystalline matrix as an instructive microenvironment for neural development. J Tissue Eng Regen Med 2008; 2:463-71. [DOI: 10.1002/term.118] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Boehrs J, Zaharias RS, Laffoon J, Ko YJ, Schneider GB. Three-Dimensional Culture Environments Enhance Osteoblast Differentiation. J Prosthodont 2008; 17:517-21. [DOI: 10.1111/j.1532-849x.2008.00330.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Matalova E, Fleischmannova J, Sharpe PT, Tucker AS. Tooth agenesis: from molecular genetics to molecular dentistry. J Dent Res 2008; 87:617-23. [PMID: 18573979 DOI: 10.1177/154405910808700715] [Citation(s) in RCA: 128] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Tooth agenesis may originate from either genetic or environmental factors. Genetically determined hypodontic disorders appear as isolated features or as part of a syndrome. Msx1, Pax9, and Axin2 are involved in non-syndromic hypodontia, while genes such as Shh, Pitx2, Irf6, and p63 are considered to participate in syndromic genetic disorders, which include tooth agenesis. In dentistry, artificial tooth implants represent a common solution to tooth loss problems; however, molecular dentistry offers promising solutions for the future. In this paper, the genetic and molecular bases of non-syndromic and syndromic hypodontia are reviewed, and the advantages and disadvantages of tissue engineering in the clinical treatment of tooth agenesis are discussed.
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Affiliation(s)
- E Matalova
- Institute of Animal Physiology and Genetics, Academy of Sciences, Brno, Czech Republic.
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Prescott RS, Alsanea R, Fayad MI, Johnson BR, Wenckus CS, Hao J, John AS, George A. In vivo generation of dental pulp-like tissue by using dental pulp stem cells, a collagen scaffold, and dentin matrix protein 1 after subcutaneous transplantation in mice. J Endod 2008; 34:421-6. [PMID: 18358888 DOI: 10.1016/j.joen.2008.02.005] [Citation(s) in RCA: 186] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2007] [Revised: 01/31/2008] [Accepted: 02/01/2008] [Indexed: 01/09/2023]
Abstract
The presence of a perforation is known to significantly compromise the outcome of endodontic treatment. One potential use of regenerative endodontic therapy might be the repair of root canal perforations. In addition to nutrients and systemic in situ interactions, the 3 main components believed to be essential for tissue regeneration are stem cells, scaffold, and growth factors. This study investigated the role of each component of the tissue engineering triad in the organization and differentiation of dental pulp stem cells (DPSCs) in a simulated furcal perforation site by using a mouse model. Collagen served as the scaffold, and dentin matrix protein 1 (DMP1) was the growth factor. Materials were placed in simulated perforation sites in dentin slices. Mineral trioxide aggregate was the control repair material. At 6 weeks, the animals were killed, and the perforation sites were evaluated by light microscopy and histologic staining. Organization of newly derived pulp tissue was seen in the group containing the triad of DPSCs, a collagen scaffold, and DMP1. The other 4 groups did not demonstrate any apparent tissue organization. Under the conditions of the present study, it might be concluded that the triad of DPSCs, a collagen scaffold, and DMP1 can induce an organized matrix formation similar to that of pulpal tissue, which might lead to hard tissue formation.
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Affiliation(s)
- Rebecca S Prescott
- Department of Endodontics, University of Illinois at Chicago, Chicago, Illinois 60612, USA
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Mohammadi M, Shokrgozar MA, Mofid R. Culture of Human Gingival Fibroblasts on a Biodegradable Scaffold and Evaluation of Its Effect on Attached Gingiva: A Randomized, Controlled Pilot Study. J Periodontol 2007; 78:1897-903. [DOI: 10.1902/jop.2007.070083] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Wu Z, Liu C, Zang G, Sun H. The effect of simvastatin on remodelling of the alveolar bone following tooth extraction. Int J Oral Maxillofac Surg 2007; 37:170-6. [PMID: 17804200 DOI: 10.1016/j.ijom.2007.06.018] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2006] [Revised: 02/27/2007] [Accepted: 06/22/2007] [Indexed: 11/19/2022]
Abstract
Suppression of residual ridge resorption after tooth extraction is a hot spot in dental research. Recently, simvastatin was reported to influence bone turnover by stimulating bone formation. In this study, the effect of simvastatin application on residual ridge resorption following tooth extraction was investigated. Sixty male Wistar rats were randomly divided into experimental and control groups (n=30). Polylactic acid/polyglycolic acid copolymer carriers, with or without simvastatin, were implanted into extraction sockets of right mandibular incisors. The rats were killed at 1, 2, 4, 8 or 12 weeks after implantation. The relative height of the residual alveolar ridge was significantly greater in the experimental compared to the control group at 2, 4, 8 and 12 weeks. The bone mineral density in the experimental group was significantly higher than that in the control group at 4, 8 and 12 weeks. A larger newly formed bone island was observed in the experimental group at 4 weeks, and higher bone formation rate and quality were found than in the control group at different time points except 1 week. The findings indicate that local application of simvastatin would effectively preserve the residual alveolar bone by promoting bone formation in the extraction socket.
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Affiliation(s)
- Z Wu
- Department of Prothodontics, School of Stomatology, JiLin University, Changchun 130041, China
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Cross KJ, Huq NL, O’Brien-Simpson NM, Perich JW, Attard TJ, Reynolds EC. The Role of Multiphosphorylated Peptides in Mineralized Tissue Regeneration. Int J Pept Res Ther 2007. [DOI: 10.1007/s10989-007-9105-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Murray PE, Garcia-Godoy F, Hargreaves KM. Regenerative endodontics: a review of current status and a call for action. J Endod 2007; 33:377-90. [PMID: 17368324 DOI: 10.1016/j.joen.2006.09.013] [Citation(s) in RCA: 507] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Revised: 09/10/2006] [Accepted: 09/18/2006] [Indexed: 12/16/2022]
Abstract
Millions of teeth are saved each year by root canal therapy. Although current treatment modalities offer high levels of success for many conditions, an ideal form of therapy might consist of regenerative approaches in which diseased or necrotic pulp tissues are removed and replaced with healthy pulp tissue to revitalize teeth. Researchers are working toward this objective. Regenerative endodontics is the creation and delivery of tissues to replace diseased, missing, and traumatized pulp. This review provides an overview of regenerative endodontics and its goals, and describes possible techniques that will allow regenerative endodontics to become a reality. These potential approaches include root-canal revascularization, postnatal (adult) stem cell therapy, pulp implant, scaffold implant, three-dimensional cell printing, injectable scaffolds, and gene therapy. These regenerative endodontic techniques will possibly involve some combination of disinfection or debridement of infected root canal systems with apical enlargement to permit revascularization and use of adult stem cells, scaffolds, and growth factors. Although the challenges of introducing endodontic tissue engineering therapies are substantial, the potential benefits to patients and the profession are equally ground breaking. Patient demand is staggering both in scope and cost, because tissue engineering therapy offers the possibility of restoring natural function instead of surgical placement of an artificial prosthesis. By providing an overview of the methodological issues required to develop potential regenerative endodontic therapies, we hope to present a call for action to develop these therapies for clinical use.
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Affiliation(s)
- Peter E Murray
- Department of Endodontics, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, FL 33328, USA.
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Abramovitch-Gottlib L, Geresh S, Vago R. Biofabricated marine hydrozoan: a bioactive crystalline material promoting ossification of mesenchymal stem cells. ACTA ACUST UNITED AC 2006; 12:729-39. [PMID: 16674287 DOI: 10.1089/ten.2006.12.729] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This study introduces a novel three-dimensional biomatrix obtained from the marine hydrocoral Millepora dichotoma as a scaffold for hard tissue engineering. Millepora dichotoma was biofabricated under field and laboratory conditions. Three-dimensional biomatrices were made in order to convert mesenchymal stem cells (MSCs) to exemplify osteoblastic phenotype. We investigated the effect of the biomatrices on MSCs proliferation and differentiation at 2, 3, 4, 7, 10, 14, 21, 28, and 42 days. Different analyses were made: light microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), calcium incorporation to newly formed tissue (alizarin red), bone nodule formation (von Kossa), fat aggregate formation (oil red O), collagen type I immunofluorescence, DNA concentrations, alkaline phosphatase (ALP) activity, and osteocalcin concentrations. MSCs seeded on Millepora dichotoma biomatrices showed higher levels of calcium and phosphate incorporation and higher type I collagen levels than did control Porites lutea biomatrices. ALP activity revealed that MSCs seeded on M. dichotoma biomatrices are highly osteogenic compared to those on control biomatrices. The osteocalcin content of MSCs seeded on M. dichotoma remained constant up to 2 weeks before rising to surpass that of seeded P. lutea biomatrices after 28 days. Our study thus showed that M. dichotoma biomatrices enhance the differentiation of MSCs into osteoblast and hence have excellent potential as bioscaffold for hard tissue engineering.
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Affiliation(s)
- Liat Abramovitch-Gottlib
- The Faculty of Engineering, Department of Biotechnology Engineering and National Biotechnology Institute, Ben Gurion University of The Negev, Beer Sheva, Israel
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Sun T, Zhu J, Yang X, Wang S. Growth of miniature pig parotid cells on biomaterials in vitro. Arch Oral Biol 2005; 51:351-8. [PMID: 16274660 DOI: 10.1016/j.archoralbio.2005.10.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2005] [Revised: 09/05/2005] [Accepted: 10/04/2005] [Indexed: 10/25/2022]
Abstract
Both Sjögren's syndrome and therapeutic irradiation for head and neck cancer lead to irreversible damage of the parenchyma of the salivary glands. This report describes an attempt to grow miniature pig (minipig) parotid gland cells on artificial films and tubular scaffolds with the ultimate intention of developing bio-engineered replacement tissue. Minipig parotid cells were isolated and cultured. The growth and structural and physiological features of the cells which were cultured on films and porous tubular scaffolds made from poly(ethylene glycol)-terephthalate (PEGT)/poly(butylene terephthalate) (PBT) were examined. By 9 days, the parotid cells on the films and the tubular scaffolds formed continuous monolayers. The secretory granules and nuclei of the cultured acinar cells remained polarised. Desmosomes, gap junctions and tight-like junctions were still present between the apical regions of adjacent cells. Amylase activity decreased during the culture period but was still evident in the medium after 10 days of culture. In conclusion, minipig parotid cells are well-maintained in vitro on both a flat surface and a three-dimensional (3D) scaffold. The addition of a Matrigel coating to the surface of synthetic materials aids cell growth and maintenance of a morphology that more closely resembles normal epithelium.
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Affiliation(s)
- Tao Sun
- Salivary Gland Disease Centre and the Molecular Laboratory for Gene Therapy, Faculty of Stomatology, Capital University of Medical Sciences, Beijing 100050, PR China
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24
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Tran SD, Wang J, Bandyopadhyay BC, Redman RS, Dutra A, Pak E, Swaim WD, Gerstenhaber JA, Bryant JM, Zheng C, Goldsmith CM, Kok MR, Wellner RB, Baum BJ. Primary culture of polarized human salivary epithelial cells for use in developing an artificial salivary gland. ACTA ACUST UNITED AC 2005; 11:172-81. [PMID: 15738672 DOI: 10.1089/ten.2005.11.172] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Therapeutic irradiation for head and neck cancer, and the autoimmune disease Sjogren's syndrome, lead to loss of salivary parenchyma. They are the two main causes of irreversible salivary gland hypofunction. Such patients cannot produce adequate levels of saliva, leading to considerable morbidity. We are working to develop an artificial salivary gland for such patients. A major problem in this endeavor has been the difficulty in obtaining a suitable autologous cellular component. This article describes a method of culturing and expanding primary salivary cells obtained from human submandibular glands (huSMGs) that is serum free and yields cells that are epithelial in nature. These include morphological (light and transmission electron microscopy [TEM]), protein expression (immunologically positive for ZO-1, claudin-1, and E-cadherin), and functional evidence. Under confocal microscopy, huSMG cells show polarization and appropriately localize tight junction proteins. TEM micrographs show an absence of dense core granules, but confirm the presence of tight and intermediate junctions and desmosomes between the cells. Functional assays showed that huSMG cells have high transepithelial electrical resistance and low rates of paracellular fluid movement. Additionally, huSMG cells show a normal karyotype without any morphological or numerical abnormalities, and most closely resemble striated and excretory duct cells in appearance. We conclude that this culture method for obtaining autologous human salivary cells should be useful in developing an artificial salivary gland.
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Affiliation(s)
- S D Tran
- National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA
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25
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Byers BA, Guldberg RE, García AJ. Synergy between genetic and tissue engineering: Runx2 overexpression and in vitro construct development enhance in vivo mineralization. ACTA ACUST UNITED AC 2005; 10:1757-66. [PMID: 15684684 DOI: 10.1089/ten.2004.10.1757] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Tissue engineering has emerged as a promising strategy to generate bone-grafting substrates. These approaches, however, are limited by an insufficient supply of committed osteoprogenitor cells and dedifferentiation of osteogenic cells during in vitro culture. To address these limitations, we engineered bone marrow stromal cells to constitutively express the osteoblastic transcription factor Runx2/Cbfa1, using retroviral gene delivery. These Runx2-modified cells were integrated into three-dimensional polymeric scaffolds to create tissue-engineered constructs. Compared with control stromal cells, Runx2 overexpression significantly upregulated osteoblastic differentiation and mineralization in vitro and in vivo in an ectopic, nonosseous subcutaneous site. More importantly, in vitro construct development to create a mineralized template before implantation dramatically enhanced subsequent in vivo mineralized tissue formation, providing a novel templating tissue-engineering strategy to improve in vivo mineralization. Finally, Runx2 overexpression and in vitro construct development synergistically enhanced in vivo mineralization compared with in vitro construct development or genetic engineering alone. This work provides a novel integrated genetic and tissue-engineering strategy to create mineralized templates for generating robust bone-grafting material.
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Affiliation(s)
- Benjamin A Byers
- Woodruff School of Mechanical Engineering; and Petit Institute for Bioengineering and Bioscience and Georgia Tech/Emory Center for the Engineering of Living Tissues, Georgia Institute of Technology, Atlanta, Georgia, USA
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26
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Taira M, Furuuchi H, Saitoh S, Sugiyama Y, Sekiyama S, Araki Y, Tabata Y. Bio-sorption of acidic gelatine hydro-gels implanted in the back tissues of Fisher's rats. J Oral Rehabil 2005; 32:382-7. [PMID: 15842249 DOI: 10.1111/j.1365-2842.2004.01417.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Recent advance in tissue engineering therapy requires new scaffold materials. Acidic gelatine powders (10 wt%) were, thus, dissolved in water, were or were not cross-linked, and freeze-dried. After sterilization, prepared small sponges were implanted in 7-week-old Fisher's rats' subcutaneous tissues for up to 2 weeks. Sponges absorbed body fluid and changed into hydro-gels in vivo. Non-cross-linked hydro-gels were absorbed within 3 days, while cross-linked hydro-gels were eliminated after 7 days' implantation. Histological observations revealed that the common captivation process was mild while granulocytes and macrophages were encountered. Because acidic gelatine sponges can accommodate various basic growth factors, it can be speculated that prepared sponges might be used as short-time hydro-gel scaffolds and growth-factor carriers.
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Affiliation(s)
- M Taira
- Department of Dental Materials Science and Technology, Iwate Medical University School of Dentistry, Iwate, Japan.
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Jin Q, Anusaksathien O, Webb SA, Printz MA, Giannobile WV. Engineering of tooth-supporting structures by delivery of PDGF gene therapy vectors. Mol Ther 2004; 9:519-26. [PMID: 15093182 PMCID: PMC2572773 DOI: 10.1016/j.ymthe.2004.01.016] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/23/2004] [Indexed: 12/21/2022] Open
Abstract
Platelet-derived growth factor (PDGF) exerts potent effects on wound healing including the regeneration of tooth-supporting structures. Limitations of topical protein delivery to periodontal osseous defects include transient biological activity and the bioavailability of PDGF at the wound site. The objective of this investigation was to determine the feasibility of in vivo PDGF-B gene transfer to stimulate periodontal tissue regeneration in large tooth-associated alveolar bone defects in rats. Periodontal lesions (0.3 x 0.2 cm in size) were treated with a 2.6% collagen matrix alone or a matrix containing adenoviruses encoding luciferase (control), a dominant negative mutant of PDGF-A (PDGF-1308), or PDGF-B. Block biopsies were harvested at 3, 7, and 14 days post-gene delivery and descriptive histology and histomorphometric analyses were performed. The defects treated with Ad-PDGF-B demonstrated greater proliferating cell nuclear antigen positively stained cells and strong evidence of bone and cementum regeneration beyond that of Ad-luciferase and Ad-PDGF-1308 groups. Quantitative image analysis showed a nearly fourfold increase in bridging bone and sixfold increase in tooth-lining cemental repair in the Ad-PDGF-B-treated sites compared to lesions treated with Ad-luciferase or collagen matrix alone, which showed limited hard tissue neogenesis. In addition, the Xenogen In Vivo Imaging System revealed sustained and localized gene expression of the luciferase reporter at the periodontal lesions for up to 21 days after gene transfer. These results indicate that in vivo direct gene transfer of PDGF-B stimulates alveolar bone and cementum regeneration in large periodontal defects. Gene therapy utilizing PDGF-B may offer the potential for periodontal tissue engineering applications.
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Affiliation(s)
- Qiming Jin
- Center for Craniofacial Regeneration and Department of Periodontics, Prevention, and Geriatrics, School of Dentistry, University of Michigan, 1011 North University Avenue, Ann Arbor, MI 48109-1078, USA
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28
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Batouli S, Miura M, Brahim J, Tsutsui TW, Fisher LW, Gronthos S, Robey PG, Shi S. Comparison of stem-cell-mediated osteogenesis and dentinogenesis. J Dent Res 2004; 82:976-81. [PMID: 14630898 DOI: 10.1177/154405910308201208] [Citation(s) in RCA: 268] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The difference between stem-cell-mediated bone and dentin regeneration is not yet well-understood. Here we use an in vivo stem cell transplantation system to investigate differential regulation mechanisms of bone marrow stromal stem cells (BMSSCs) and dental pulp stem cells (DPSCs). Elevated expression of basic fibroblast growth factor (bFGF) and matrix metalloproteinase 9 (MMP-9, gelatinase B) was found to be associated with the formation of hematopoietic marrow in BMSSC transplants, but not in the connective tissue of DPSC transplants. The expression of dentin sialoprotein (DSP) specifically marked dentin synthesis in DPSC transplants. Moreover, DPSCs were found to be able to generate reparative dentin-like tissue on the surface of human dentin in vivo. This study provided direct evidence to suggest that osteogenesis and dentinogenesis mediated by BMSSCs and DPSCs, respectively, may be regulated by distinct mechanisms, leading to the different organization of the mineralized and non-mineralized tissues.
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Affiliation(s)
- S Batouli
- Craniofacial and Skeletal Diseases Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892, USA
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Abstract
Animal experimentation is an integrated part of tissue engineering research. This paper investigates what scientists conducting such experimentation should reasonably take into consideration from an ethical point of view. It is argued that scientists should use their moral imagination in making fundamental ethical choices, in reflecting on legal regulation, in taking public opinion seriously, and in balancing human benefit and animal harm as expected outcomes of the experiments.
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Affiliation(s)
- Anders Nordgren
- Section for Biomedical Ethics, Department of Public Health and Caring Sciences, Uppsala University, Uppsala Science Park, Uppsala SE-751 85, Sweden.
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30
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Chattopadhyay A, Slade GD, Shugars DA. Charges for oral health care during a period of economic growth in the US: 1987-96. J Public Health Dent 2003; 63:104-11. [PMID: 12816141 DOI: 10.1111/j.1752-7325.2003.tb03483.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES This study aimed to provide estimates of amounts charged for dental care during 1996 for the US adult population and its major sociodemographic subgroups, and to evaluate whether charges had increased since 1987. METHODS We used data from the 1996 Medical Expenditures Panel Survey and report results for 12,931 adults aged 19-64 years. For comparison with previously published charges, we converted 1987 charges to their 1996 "constant dollar" value to control for inflation. Data were analyzed using SUDAAN and the results can be generalized to the US adult population. RESULTS In 1996, 43.7 percent (95% CI=42.7%, 44.6%) of the US population incurred dental care charges, which did not differ significantly from the 1987 estimate of 44.5 percent. In 1996, mean per capita charge for dental care was 182 dollars (95% CI=171 dollars, 192 dollars), which did not differ significantly from the inflation-adjusted 1987 estimate of 174 dollars. The average charge per patient who incurred charges in 1996 was 416 dollars (95% CI=394 dollars, 438 dollars), which was only 7 percent greater than the inflation-adjusted 1987 estimate of 389 dollars (P=.08). Sociodemographic variations were observed in per capita charges, but were less apparent in mean charge per patient who incurred charges. CONCLUSIONS During a period when economic growth and other market forces were expected to increase delivery of dental services, there was little or no change in percentage of US adults incurring charges or in mean per capita charges. The booming US economy did not raise dental charges significantly and did not increase utilization of dental care services.
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MESH Headings
- Adult
- Confidence Intervals
- Dental Care/economics
- Employment
- Ethnicity
- Fees, Dental/classification
- Fees, Dental/statistics & numerical data
- Fees, Dental/trends
- Female
- Financing, Government/economics
- Financing, Government/statistics & numerical data
- Financing, Personal/economics
- Financing, Personal/statistics & numerical data
- Health Expenditures/statistics & numerical data
- Health Expenditures/trends
- Humans
- Income
- Inflation, Economic
- Insurance, Health, Reimbursement/economics
- Insurance, Health, Reimbursement/statistics & numerical data
- Male
- Middle Aged
- Reimbursement Mechanisms/economics
- Reimbursement Mechanisms/statistics & numerical data
- United States
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Affiliation(s)
- Amit Chattopadhyay
- Department of Dental Ecology, School of Dentistry, University of North Carolina, Chapel Hill, NC 27599-7450, USA
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Murray PE, Windsor LJ, Smyth TW, Hafez AA, Cox CF. Analysis of pulpal reactions to restorative procedures, materials, pulp capping, and future therapies. CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 2003; 13:509-20. [PMID: 12499243 DOI: 10.1177/154411130201300607] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Every year, despite the effectiveness of preventive dentistry and dental health care, 290 million fillings are placed each year in the United States; two-thirds of these involve the replacement of failed restorations. Improvements in the success of restorative treatments may be possible if caries management strategies, selection of restorative materials, and their proper use to avoid post-operative complications were investigated from a biological perspective. Consequently, this review will examine pulp injury and healing reactions to different restorative variables. The application of tissue engineering approaches to restorative dentistry will require the transplantation, replacement, or regeneration of cells, and/or stimulation of mineralized tissue formation. This might solve major dental problems, by remineralizing caries lesions, vaccinating against caries and oral diseases, and restoring injured or replacing lost teeth. However, until these therapies can be introduced clinically, the avoidance of post-operative complications with conventional therapies requires attention to numerous aspects of treatment highlighted in this review.
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Affiliation(s)
- Peter E Murray
- Department of Oral Biology, Indiana University School of Dentistry, 1121 West Michigan Street, Indianapolis, IN 46202-5186, USA.
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Murray PE, Smith AJ. Saving pulps--a biological basis. An overview. PRIMARY DENTAL CARE : JOURNAL OF THE FACULTY OF GENERAL DENTAL PRACTITIONERS (UK) 2002; 9:21-6. [PMID: 11901786 DOI: 10.1308/135576102322547511] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
AIM Cavity preparation and restoration variables have an uncertain relationship to pulp injury and repair responses. The purpose of this paper is to determine the importance of cavity preparation and restoration variables, by ranking them according to their effect on pulp injury (odontoblast survival) and pulp repair (reactionary dentine secretion). METHOD The seven studies reviewed are all based on the protocols described by Murray, Smith and colleagues in 2000 and 2001. RESULTS The studies reviewed provide new perspectives on the importance of cavity preparation and restoration variables in mediating pulp activity. CONCLUSIONS The onset of post-operative complications may be most productively minimised by focusing practitioner attention to aspects of treatment highlighted in this review.
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Baum BJ, Scott J, Bickel M, Gombos G, Greenspan JS, Guo W, Park NH, Purdell-Lewis D, Ranney R, Schwarz E, Seymour G, Uoshima K. 5.3 Global challenges in research and strategic planning. EUROPEAN JOURNAL OF DENTAL EDUCATION : OFFICIAL JOURNAL OF THE ASSOCIATION FOR DENTAL EDUCATION IN EUROPE 2002; 6 Suppl 3:179-184. [PMID: 12390276 DOI: 10.1034/j.1600-0579.6.s3.24.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Health sciences research is experiencing dramatic progress. How can dental schools throughout the world best make these research advances relevant for dental students, as well as providing them with the means to assess and utilize the research advances that will occur in the future? This complex question presents a critical challenge to the dental educational community. Research is clearly integral to the mission of dental education. By providing dental students with active learning strategies, dental educators can inculcate the ability for independent scientific thinking and thereby develop reflective as well as technically competent practitioners. However, there is a shortage of well-trained individuals to fill faculty and research positions in certain parts of the world. Global networks for mutual information exchange are imperative to overcome resource limitations in individual institutions, as is dedicated funding for research in the dental educational setting.
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Renson T. The mapping of the human genome and dental bioengineering. PRIMARY DENTAL CARE : JOURNAL OF THE FACULTY OF GENERAL DENTAL PRACTITIONERS (UK) 2001; 8:131. [PMID: 11799708 DOI: 10.1308/135576101322462147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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35
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Zhu Z, Lee C, Tejeda K, Giannobile W. Gene transfer and expression of platelet-derived growth factors modulate periodontal cellular activity. J Dent Res 2001; 80:892-7. [PMID: 11379891 PMCID: PMC2584017 DOI: 10.1177/00220345010800030901] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Platelet-derived growth factor (PDGF) is a potent stimulator of wound healing. PDGF gene therapy may promote greater periodontal regeneration than local protein application, due to sustained growth factor delivery to the target tissue. This investigation tested the ability of recombinant adenoviruses (rAds) encoding PDGF-A or PDGF-1308 (a PDGF-A dominant-negative mutant that disrupts endogenous PDGF bioactivity) to affect cells derived from the periodontium. Osteoblasts, periodontal ligament fibroblasts, and gingival fibroblasts were transduced with rAds, and gene expression, DNA synthesis, and cell proliferation were evaluated. The results revealed strong message for the PDGF-A gene for 7 days following gene delivery. Ad2/PDGF-A enhanced the mitogenic and proliferative response in all cell types, while Ad2/PDGF-1308 potently inhibited mitogenesis and proliferation. In conclusion, Ad2/PDGF can effectively transduce cells derived from the periodontium and promote biological activity equivalent to PDGF-AA. These studies support the potential use of gene therapy for sustained PDGF release in periodontal tissues.
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Affiliation(s)
- Z. Zhu
- Dept. of Microbiology and Molecular Genetics, Harvard Medical School & Dana-Farber/Harvard Cancer Center, Boston, MA, USA
| | - C.S. Lee
- Dept. of Periodontics/Prevention/Geriatrics & Center for Biorestoration of Oral Health, The University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA
| | - K.M. Tejeda
- Dept. of Periodontics/Prevention/Geriatrics & Center for Biorestoration of Oral Health, The University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA
| | - W.V. Giannobile
- Dept. of Periodontics/Prevention/Geriatrics & Center for Biorestoration of Oral Health, The University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA
- corresponding author,
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Abstract
In the last decade, two areas of biomedical research--gene therapy and tissue engineering--have especially captured the imagination of the public. Both areas offer the potential for the treatment of clinical conditions that now are considered impossible or extremely difficult to manage by conventional therapeutic measures. Gene therapy has made remarkable scientific progress in the laboratory, but has yet to realize its enormous clinical promise. Tissue engineering studies have led to some tangible clinical breakthroughs, but the routine replacement of whole internal organs is still well into the future. This report will examine the applications of gene therapy and tissue engineering to salivary glands, with a focus on the repair of irreversible gland damage.
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Affiliation(s)
- B J Baum
- Gene Therapy and Therapeutics Branch, National Institute of Dental and Craniofacial Research, NIH, Bethesda, MD 20892-1190, USA.
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37
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Abstract
Tissue engineering is an interdisciplinary field that will yield new sources of tissue for clinical and research purposes in oncology. Bone is under intense investigation by this field. Relevant areas of progress are in advanced computing, biomaterials, cell technology, growth factor fabrication and delivery, and gene manipulation. Clinical techniques will emerge from continued investigation in each of these areas. Techniques that are developed must be scaled up to industry with products cleared by regulatory agencies and acceptable to clinicians and patients. The goals of tissue engineering in oncology are improved tissue models for basic cancer research and a change in clinical practice. Semin. Surg. Oncol. 19:294-301, 2000.
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Affiliation(s)
- M J Miller
- Department of Plastic Surgery, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030, USA.
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