Download or read book Ion Exchange Strengthening of a Leucite Reinforced Dental Ceramic written by Jose J. Villalobos and published by . This book was released on 1997-07-01 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demand for improved dental esthetics has led to an increased use of ceramics in dentistry, specifically all-ceramic restorations. Unfortunately, the brittle characteristics of dental ceramics remain an area of concern and limit their applications. Metal-ceramic restorations have proven successful, but problems associated with the use of metal substructures exist. Numerous all- ceramic systems have been introduced, however strengths equivalent to metal- ceramic restorations have not been obtained. As a result, strengthening techniques are being actively investigated.
Download or read book Ion Exchange Strengthening of a Leucite reinforced Dental Ceramic written by Jose J. Villalobos and published by . This book was released on 1997 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strengthening Dental Porcelains by Ion Exchange Process written by Humberto Naoyuki Yoshimura and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Porcelains have been used in dentistry for many decades because of their excellent aesthetic qualities, besides other favorable characteristics. Despite these desirable characteristics, porcelain restorations may fail in the oral environment due to fracture. Studies on the clinical success rate of porcelain onlays, inlays and veneers have shown that their fracture rate is relatively high and is among the main reasons for failure of these restorations. The fracture of dental porcelains is a consequence of its brittle nature and low fracture toughness. Porcelains are also highly susceptible to weakening during their lifetime in the oral environment, because the sizes of defects tend to increase by the slow crack growth phenomenon. Therefore, in order to increase the lifetime of porcelain restorations, it is necessary to enhance their overall resistance to crack propagation. Among the methods proposed to strengthen glasses and ceramics, a potential method to improve the mechanical properties of dental porcelains is the chemical strengthening or tempering by the ion exchange process. In this chapter, the effects of chemical tempering on mechanical behavior of dental porcelains are reviewed. Dental porcelains are based on alkali-containing aluminosilicate glass compositions and can have leucite (KAlSi2O6) crystalline particles dispersed in the glassy matrix. The ion exchange process can be carried out by the paste method using KNO3 salt at a temperature that is 80% of glass transition temperature (Tg) of porcelain during a short time (15 to 30 min). In this treatment, the small Na+ ions in the glassy matrix are exchanged by larger K+ ions from the salt, resulting in a K+ concentration profile that results in a steep gradient of residual compressive stress by the ion stuffing effect at the surface region of the porcelain. No significant variations in strengthening have been observed when temperature and time varied around the above indicated values, since the increase in these parameters enhanced the stress relaxation process, which hinders the effect of higher ion interdiffusion. Although few porcelains with high leucite content have no strengthening response to ion exchange process, most dental porcelains can be strengthened and significant increases in fracture toughness (up to around 150%) have been reported. The same level of increase in flexural strength has been observed, but the variability of fracture stress also increases due to the relative small thickness of compressive layer and the decreasing resistance curve effect. The lower reliability is counterbalanced by significant increases of the resistance to slow crack growth phenomenon, leading to higher strength retention after long lifetimes even at low levels of fracture probability. Therefore, it is expected that the application of chemical tempering (strengthening by ion exchange) can improve the lifetime of dental porcelain restorations.
Download or read book Ion Exchange written by Ayben Kilislioglu and published by BoD – Books on Demand. This book was released on 2015-09-09 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides broad coverage of ion exchange and its applications. Different chapters focus on the importance of ion exchange applications such as strengtening dental porcelains, gradient changes in glass refraction, and resins as effective sorbents. Each chapter includes a brief historical overview of ion exchange and its applications. The authors also give a brief overview of these applications as well as review current experimental data on the subject.
Download or read book Phillips Science of Dental Materials written by Kenneth J. Anusavice, DMD, PhD and published by Elsevier Health Sciences. This book was released on 2012-09-27 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn the most up-to-date information on materials used in the dental office and laboratory today. Emphasizing practical, clinical use, as well as the physical, chemical, and biological properties of materials, this leading reference helps you stay current in this very important area of dentistry. This new full-color edition also features an extensive collection of new clinical photographs to better illustrate the topics and concepts discussed in each chapter. Organization of chapters and content into four parts (General Classes and Properties of Dental Materials; Auxiliary Dental Materials; Direct Restorative Materials; and Indirect Restorative Materials) presents the material in a logical and effective way for better comprehension and readability. Balance between materials science and manipulation bridges the gap of knowledge between dentists and lab technicians. Major emphasis on biocompatibility serves as a useful guide for clinicians and educators on material safety. Distinguished contributor pool lends credibility and experience to each topic discussed. Critical thinking questions appearing in boxes throughout each chapter stimulate thinking and encourage classroom discussion of key concepts and principles. Key terms presented at the beginning of each chapter helps familiarize readers with key terms so you may better comprehend text material. NEW! Full color illustrations and line art throughout the book make text material more clear and vivid. NEW! Chapter on Emerging Technologies keeps you up to date on the latest materials in use. NEW! Larger trim size allows the text to have fewer pages and makes the content easier to read.
Download or read book The Effect of Ion Exchange on the Diametral Strength of Porcelain written by Ih Hoon Kim and published by . This book was released on 1991 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Services for Oklahoma s Delinquent Deprived INT INS Children written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dental Materials at a Glance written by J. Anthony von Fraunhofer and published by John Wiley & Sons. This book was released on 2013-05-06 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dental Materials At A Glance is a title in the highly popular at a Glance series. It provides a concise and accessible introduction and revision aid. Following the familiar, easy-to-use at a Glance format, each topic is presented as a double-page spread with key facts accompanied by clear diagrams encapsulating essential information. Systematically organized and succinctly delivered, Dental Materials At A Glance covers: Each major class of dental materials and biomaterials Basic chemical and physical properties Clinical handling and application Complications and adverse effects of materials Dental Materials At A Glance is the ideal companion for all students of dentistry and junior clinicians. In addition the text will provide valuable insight for general dental practitioners wanting to update their materials knowledge.
Download or read book American Journal of Dentistry written by and published by . This book was released on 2003 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clinical Applications of Biomaterials written by Gurbinder Kaur and published by Springer. This book was released on 2017-06-07 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the most novel and state-of-the-art applications of biomaterials, with chapters that exemplify approaches with targeted drug delivery, diabetes, neurodegenerative diseases and cranioplasty implants. Expert contributors analyze biomaterials such as calcium phosphate, sol-gel and quenched glasses, metallic and polymer implants, bioactive glass, and polymer composites while also covering important areas such as the soft tissue replacement, apatites, bone regeneration and cell encapsulation. This book is appropriate for biomedical engineers, materials scientists, and clinicians who are seeking to implement the most advanced approaches and technologies with their patients.
Download or read book Contemporary Fixed Prosthodontics E Book written by Stephen F. Rosenstiel and published by Elsevier Health Sciences. This book was released on 2015-07-28 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contemporary Fixed Prosthodontics, 4th Edition is a comprehensive, user-friendly text that offers dental students and practitioners an excellent opportunity to understand the basic principles of fixed prosthodontics. This text provides a strong foundation in basic science, followed by practical step-by-step clinical applications. Procedures are presented in an organized, systematic format, and are illustrated by over 3,000 clear, high-quality drawings and photographs, now in full-color. The material is logically divided into sections that cover planning and preparation, clinical procedures, and laboratory procedures. The text also includes two invaluable appendices that provide an updated list of dental materials and equipment, as well as a guide to manufacturers. Follows ADEA curriculum guidelines for fixed prosthodontics Features hundreds of step-by-step procedures Integrates basic science with clinical applications End-of-chapter glossaries consistent with the most recent edition of The Glossary of Prosthodontic Terms (see above) Text boxes scattered throughout present quick facts and tips about selected artwork Selected key terms presented at the beginning of each chapter and set in bold type within the text facilitates rapid information retrieval Essay format study questions offer the reader an opportunity to test his or her knowledge and comprehension after reading each chapter Updated references support concepts presented in each chapter. Valuable appendices on dental materials/equipment and manufacturers. 15 contributors collaborate with the editors to present up-to-date information and state-of-the-art techniques in prosthodontics. NEW full-color photos and drawings enhance your understanding and comprehension of each topic, and show the newest instruments and equipment. NEW Periodontal Considerations chapter offers a new approach to comprehensive fixed prosthodontics treatment, covering the concepts and clinical modes of periodontal therapy available prior to the development of an appropriate diagnosis and treatment plan. NEW section on digital impression techniques describes how to create a virtual, computer-generated replica of the hard and soft tissues in the mouth using lasers and other optical scanning devices. NEW section on virtual articulators addresses the new software tool providing dynamic visualization of the occlusal surface, eliminating the need for a mechanical articulator, with modules discussing the contact of the occlusal surface of the maxilla and mandible and the relation to the condylar movement. NEW section on cone beam imaging allows clear visualization of osseous contours and bone volume, facilitating better decisions about the size of implant fixtures that realistically can be accommodated. NEW section on digital interim fixed restorations covers the fabrication of large multi-unit composite or polymethyl methacrylate external surface forms in advance for use with indirect/direct restorative techniques.
Download or read book An Assessment of Slow Crack Growth in Leucite reinforced Ceramics written by Pakawat Chatriyanuyoke and published by . This book was released on 2009 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Purpose: To assess the slow crack growth parameters of a leucite-reinforced dental ceramic under constant stress rate condition and determine the influence of the environment and surface finish on the resulting parameters. Materials & methods: 130 ceramic plates (Pro-CAD, Ivoclar Vivadent, Schaan, Liechtenstein) of 0.7 mm thick were prepared and one surface finished with 600 grit SiC slurry. Ten specimens were used to evaluate the inert strength and serve as the control group (Control). The remaining specimens were arbitrarily divided into 3 groups: In air @ ambient temperature (SCA), in water @ ambient temperature (SCW), and etched tensile surface in air @ambient temperature (HFA). All specimens were tested under constant stress-rate biaxial flexural strength in a manner similar to that described in ASTM C 1368. The specimens from each of the 3 experimental group were tested at four different cross head speed of: 0.01, 0.05, 0.1, and 1 mm/min, respectively using a displacement controlled universal testing machine. The inert group was tested in silicone oil at 1 mm/min. The flexural strength and stress rate were determined for each speciman and the SCG parameters n and D were calculated for each of the experimental groups. Results: The resulting SCG parameters for each experimental group were n = 38.19 and D = 143.34 for group SCA, n = -59.32 and D = 145.97 for group SCW, and n = 40.21 and D = 148.65 for group HFA. Group SCW showed the lowest resistance to stress corrosion (n = -59.32) compared to the other groups. The inert strength of the leucite ceramic resulted in the highest mean strength 180.4 MPa. Conclusions: There is no different in SCG parameter (n) from constant stress-rate test between group SCA and HFA for the ProCAD material tested. ProCAD more susceptible to subcritical crack growth when compared to ambient air.
Download or read book Contemporary Fixed Prosthodontics written by Stephen F. Rosenstiel and published by Elsevier Health Sciences. This book was released on 2006-01-01 with total page 1141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Find practical step-by-step guidelines to hundreds of fixed prosthodontics procedures! Contemporary Fixed Prosthodontics, 5th Edition provides a strong foundation in basic science along with clear descriptions of clinical applications. Using more than 3,000 high-quality drawings and photographs, this reference covers everything from tooth preparation to prostheses and restorations to follow-up care. New to this edition is a chapter on periodontal considerations plus new sections on topics such as cone beam imaging and virtual articulators. From respected prosthodontics educators and clinicians Stephen Rosenstiel, Martin Land, and Junhei Fujimoto, Contemporary Fixed Prosthodontics includes separate sections covering planning and preparation, clinical procedures, and laboratory procedures, making it easier to look up the information you need. Illustrated, full-color step-by-step procedures walk you through all the steps of treatment from the beginning to the final treatment result. Summary charts provide a quick, at-glance review of specific procedures (such as Class II inlay preparation and all-ceramic crown preparation), highlighting the indications, contraindications, advantages, disadvantages, preparation steps, recommended armamentarium, and criteria. Prosthodontic Diagnostic Index helps you determine the appropriate treatments for completely edentulous, partially edentulous, and dentate patients, using guidelines and illustrations from the American College of Prosthodontists. Text boxes accompany selected illustrations, presenting quick facts and tips relating to techniques or concepts. Study questions offer an opportunity to test your knowledge and comprehension at the end of each chapter. Useful appendices list dental materials, equipment, and manufacturers. NEW full-color photos and drawings enhance your understanding and comprehension of each topic, and show the newest instruments and equipment. NEW Periodontal Considerations chapter offers a new approach to comprehensive fixed prosthodontics treatment, covering the concepts and clinical modes of periodontal therapy available prior to the development of an appropriate diagnosis and treatment plan. NEW section on digital impression techniques describes how to create a virtual, computer-generated replica of the hard and soft tissues in the mouth using lasers and other optical scanning devices. NEW section on virtual articulators addresses the new software tool providing dynamic visualization of the occlusal surface, eliminating the need for a mechanical articulator, with modules discussing the contact of the occlusal surface of the maxilla and mandible and the relation to the condylar movement. NEW section on cone beam imaging allows clear visualization of osseous contours and bone volume, facilitating better decisions about the size of implant fixtures that realistically can be accommodated. NEW section on digital interim fixed restorations covers the fabrication of large multi-unit composite or polymethyl methacrylate external surface forms in advance for use with indirect/direct restorative techniques.
Download or read book Textbook of Operative Dentistry written by Nisha Garg and published by Boydell & Brewer Ltd. This book was released on 2010-08 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition is a complete guide to operative dentistry. Beginning with an introduction, physiology, dental caries and tooth preparation, the text also discusses pain and infection control. The following sections examine different operative procedures. New techniques such as minimal intervention dentistry, nanotechnology and lasers; and advances in dental materials are discussed in detail. More than 1200 colour images, illustrations, flow charts and tables are included. Key points Complete guide to operative dentistry Discusses numerous different procedures, and pain and infection control New techniques and advances in materials described in detail More than 1200 colour images, illustrations, flow charts and tables Previous edition published in 2010
Download or read book Annual Review of Materials Science written by Elton N. Kaufmann and published by . This book was released on 1997-08 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Craig s Restorative Dental Materials written by John M. Powers and published by Mosby. This book was released on 2006 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a comprehensive exploration of restorative dental materials, this book provides the information readers need to know to correctly use dental materials in the clinic and dental laboratory. Ranging from fundamental concepts to advanced skills, it also provides the scientific basis for technical procedures and manipulation of materials.
Download or read book Glasses and Glass Ceramics for Medical Applications written by Emad El-Meliegy and published by Springer Science & Business Media. This book was released on 2011-12-02 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glass ceramics are a special group of materials in which a base glass can be crystallized under carefully controlled conditions, which in turn determine the properties of the material. These materials offer a wide range of physical and mechanical properties combining the distinctive characteristics of sintered ceramics and glasses. This book provides readers with an interest in medical ceramics with the ability to start making their own glasses and glass ceramics, together with an understanding of the various factors that control the final properties of these medical and dental materials. In addition, the authors describe various industrial problems with current, clinically-used medical glass ceramics and discuss appropriate scientific solutions. Glasses and Glass Ceramics for Medical Applications will appeal to a broad audience of biomaterials scientists, ceramists, and bioengineers, particularly those with an interest in orthopedic and dental applications, as well as scientists and engineers involved in the manufacture of glasses, glazes, enamels, and other glass coatings for the medical materials industry. The book will also be of interest to undergraduate and graduate students in materials engineering and dentistry, and is suitable for use in courses on medical and dental materials.
