Download or read book Mechanistic Aspects of Fracture and Fatigue in Resin Based Dental Restorative Composites written by Minalben B. Shah and published by . This book was released on 2009 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: For resin based dental restorative composites, one of the major challenges is to optimize the balance between mechanical and optical properties. Although fracture is the second leading cause of dental restorative failures, very limited mechanistic understanding exists on a microscopic level. In the present study, the fracture properties and mechanisms of two commercial dental resin composites with different microstructures are examined using double notched four point beam bending and pre-cracked compact-tension, C(T), specimens. Four point bend flexural strength was also measured using un-notched beam samples. The first material is a microhybrid composite that combines a range of nano and micro scale filler particles to give an average particle size of 0.6 [mu]m, while the second is a nanofill composite reinforced entirely with nano particles and their agglomerates. The influences of 60 days water hydration and a post-cure heat treatment were also examined. Fracture resistance curve (R-curve) experiments have demonstrated the microhybrid composite to be more fracture resistant than the nanofill composite in both as-processed and hydrated conditions. Rising fracture resistance with crack extension was observed in all specimens, independent of the environmental conditions. Compared to the as-processed condition, a significant reduction in the peak toughness was observed for the nanofill composite after 60 days of water aging. Hydration lowered flexural strength of both composites which was attributed to hydrolytic matrix degradation with additional interfacial debonding causing larger strength decrease in the nanofill. Optical and SEM observations revealed an interparticle matrix crack path promoting crack deflection as a toughening mechanism in all cases except the hydrated nanofill which showed particle-matrix debonding. Crack bridging was another observed extrinsic toughening mechanism that was believed to be responsible for the rising fracture resistance curve (R-curve) behavior. Post-curing heat treatment changed the R-curve shape which was attributed to matrix toughening. Fatigue crack growth resistance was also measured after water aging for 60 days and testing in wet conditions. The da/dN-[Delta]K curve showed sigmoidal behavior with three different fatigue crack growth regions. The nanofill composite had a lower fatigue threshold, [Delta]K[subscript th], by ~ 0.13 MPa/m compared to the microhybrid composite, with an observed plateau in the fatigue crack growth curve suggestive of environmental attack. Toughening mechanisms of crack deflection and crack bridging were identified with evidence of cluster-matrix debonding in the nanofill composite. In general, fatigue crack growth ranged from ~10−9 to 10−5 m/cycle over [Delta]K of 0.54 to 0.63 MPa/m for the microhybrid composite and [Delta]K of 0.41 to 0.67 MPa/m for the nanofill composite.

Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1978 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of the National Institute of Standards and Technology Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1981 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of the National Bureau of Standards Catalog written by United States. National Bureau of Standards and published by . This book was released on 1980 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Bioceramics and Biocomposites written by Iulian Vasile Antoniac and published by Springer. This book was released on 2016-05-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook describes several current trends in the development of bioceramics and biocomposites for clinical use in the repair, remodelling, and regeneration of bone tissue. Comprehensive coverage of these materials allows fundamental aspects of the science and engineering to be seen in close relation to the clinical performance of dental and orthopaedic implants. Bioceramics and biocomposites appear to be the most dynamic area of materials development for both tissue engineering and implantable medical devices. Almost all medical specialties will continue to benefit from these developments, but especially dentistry and orthopaedics. In this Handbook, leading researchers describe the use of bionanomaterials to create new functionalities when interfaced with biological molecules or structures. Also described are technologies for bioceramics and biocomposites processing in order to fabricate medical devices for clinical use. Another important section of the book is dedicated to tissue regeneration with development of new matrices. A targeted or personalized treatment device reduces drug consumption and treatment expenses, resulting in benefits to the patient and cost reductions for public health systems. This authoritative reference on the state-of-the-art in the development and use of bioceramics and biocomposites can also serve as the basis of instructional course lectures for audiences ranging from advanced undergraduate students to post-graduates in materials science and engineering and biomedical engineering.

Download or read book Fracture and Fatigue written by Lawrence J. Broutman and published by . This book was released on 1974 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dental Composite Materials for Direct Restorations written by Vesna Miletic and published by Springer. This book was released on 2017-11-25 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers both basic scientific and clinically relevant aspects of dental composite materials with a view to meeting the needs of researchers and practitioners. Following an introduction on their development, the composition of contemporary composites is analyzed. A chapter on polymerization explains the setting reactions and light sources available for light-cured composites. The quality of monomer-to-polymer conversion is a key factor for material properties. Polymerization shrinkage along with the associated stress remains among the most challenging issues regarding composite restorations. A new classification of dental composites is proposed to offer more clinically relevant ways of differentiating between commercially available materials. A review of specific types of composites provides an insight into their key issues. The potential biological issues of dental composites are reviewed in chapters on elution of leachable substances and cariogenicity of resin monomers. Clinical sections focus on material placement, finishing procedures, and the esthetics and clinical longevity of composite restorations. Bonding to tooth tissues is addressed in a separate chapter, as is the efficiency of various composite repair methods. The final chapter discusses future perspectives on dental composite materials.

Download or read book Fracture Toughness of Aged Composite Resin Restorative Materials written by Decky J. Indrani and published by . This book was released on 1994 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the IEEE Annual Northeast Bioengineering Conference written by and published by . This book was released on 2002 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue and Fracture of Adhesively Bonded Composite Joints written by Anastasios P. Vassilopoulos and published by Woodhead Publishing. This book was released on 2017-11-13 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is commonly accepted that the majority of engineering failures happen due to fatigue or fracture phenomena. Adhesive bonding is a prevailing joining technique, widely used for critical connections in composite structures. However, the lack of knowledge regarding fatigue and fracture behaviour, and the shortage of tools for credible fatigue design, hinders the potential benefits of adhesively bonded joints. The demand for reliable and safe structures necessitates deep knowledge in this area in order to avoid catastrophic structural failures. This book reviews recent research in the field of fatigue and fracture of adhesively-bonded composite joints. The first part of the book discusses the experimental investigation of the reliability of adhesively-bonded composite joints, current research on understanding damage mechanisms, fatigue and fracture, durability and ageing as well as implications for design. The second part of the book covers the modelling of bond performance and failure mechanisms in different loading conditions. A detailed reference work for researchers in aerospace and engineeringExpert coverage of different adhesively bonded composite joint structuresAn overview of joint failure

Download or read book Dental Biomaterials written by R V Curtis and published by Elsevier. This book was released on 2014-01-23 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dental Biomaterials: Imaging, Testing and Modelling reviews the materials used in this important area, their performance and how such performance can be measured and optimised. Chapters review optical and electron microscopy imaging techniques for dental biomaterial interfaces. Specific materials such as dental cements, fibre-reinforced composites, metals and alloys are discussed. There is an analysis of stresses, fracture, wear and ageing in dental biomaterials as well as an evaluation of the performance of dental adhesives and resin-dentin bonds. Chapters also review ways of assessing the performance of dental handpieces, crowns, implants and prosthesies. The book also reviews the use of computer models in such areas as bond strength and shape optimisation of dental restorations.With its distinguished editors and team of experienced contributors DDental Biomaterials: Imaging, Testing and Modelling researchers, materials scientists, engineers and dental practitioners with an essential guide to the use and performance of dental biomaterials. - An essential guide to the use and performance of dental biomaterials - Reviews optical and electron microscopy imaging techniques for dental biomaterial interfaces - Analyses stresses, fracture, wear and ageing in dental biomaterials and evaluates the performance of dental adhesives and resin-dentin bonds

Download or read book Mechanics of Composite and Multi functional Materials Volume 6 written by Piyush R Thakre and published by Springer. This book was released on 2017-11-08 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanics of Composite, Hybrid, and Multifunctional Materials, Volume 6 of the Proceedings of the 2017 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, the sixth volume of nine from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on a wide range of areas, including: Nano & Particulate Composites Recycled Constituent Composites Hybrid Composites Multifunctional Materials Fracture & Fatigue of Composites Novel Developments in Composites Mechanics of Composites

Download or read book Effect of Varying the Filler Content on Diametral Tensile Strength and Fracture Toughness of a Dental Composite Resin written by William Walter Johnson and published by . This book was released on 1989 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Dental Materials and Their Selection written by William Joseph O'Brien and published by Quintessence Publishing (IL). This book was released on 1997 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1. A Comparison of Metals, Ceramics, and Polymers. -- 2. Physical Properties. -- 3. Color and Appearance. -- 4. Surface Phenomena and Adhesion to Tooth Structure. -- 5. Gypsum Products. -- 6. Polymers and Polymerizations: Denture Base Polymers. -- 7. Polymeric Restorative Materials: Composites and Sealants. -- 8. Abrasion, Polishing, and Bleaching. -- 9. Impression Materials. -- 10. Waxes. -- 11. Dental Cements. -- 12. Structure and Properties of Metals and Alloys. -- 13. Dental Amalgams. -- 14. Direct Gold Filling Materials. -- 15. Precious Metal Casting Alloys. -- 16. Alloys for Porcelain-Fused-to-Metal Restorations. -- 17. Casting. -- 18. High-Temperature Investments. -- 19. Base Metal Casting Alloys. -- 20. Orthodontic Wires. -- 21. Dental Porcelain. -- 22. Soldering, Welding, and Electroplating. -- 23. Dental Implant Materials.

Download or read book Applied Fracture Mechanics written by Alexander Belov and published by BoD – Books on Demand. This book was released on 2012-12-12 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book "Applied Fracture Mechanics" presents a collection of articles on application of fracture mechanics methods to materials science, medicine, and engineering. In thirteen chapters, a wide range of topics is discussed, including strength of biological tissues, safety of nuclear reactor components, fatigue effects in pipelines, environmental effects on fracture among others. In addition, the book presents mathematical and computational methods underlying the fracture mechanics applications, and also developments in statistical modeling of fatigue. The work presented in this book will be useful, effective, and beneficial to mechanical engineers, civil engineers, and material scientists from industry, research, and education.