Download or read book In Vitro Full Field Bone Strain Analysis of Implants Loaded with Axial and Cantilevered Abutments Using Reflection Photoelasticity written by Simon Paul Watson and published by . This book was released on 2014 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Stress Analysis on the Effect of an Implant Alignment Offset and Load Direction in the Posterior Mandible written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Background;Slight offset of the central implant in 3-unit implant-supported prostheses has been recommended to improve biomechanical behavior.However, studies that assessed the effects of an offset implant congfiguration in the posterior mandible are rare.Aim/Hypothesis;The purpose of this 3-dimensional (3D) finite element study was to assess the effects of load direction and number of implant in 3-unitimplant-supported prostheses with varying implant positions (straight-line or offset) on the stress distribution in the implant,prosthesis, and bone tissue.Materials and Methods;Three 3D models were used to simulate a posterior mandible bone block: 2 implants and 3-unit fixed dental prosthesis(FDP) with apontic in the middle (model M1), 2 implants and 3-unit FDP with a cantilever pontic at one end (model M2), FDP supported by 3implant with straight line placement (model M3) and FDP supported by 3 implant with staggered implant configuration (model M4).The applied forces were 120 N axially (L1), or 120 N obliquely(L2). The type of implant platform simulated was an external hexagon.Maximum von Mises stress (VMS) on the fixture, abutment, screws, fixed prosthesis and supporting alveolar bone was measured andanalyzed.Results;Peak VMS in the implants by oblique loading were 10-25 times greater in implant and 6-12 times greater in alveolar bone,respectively than the stresses by axial loading.Compared to the maximum stress value of the implant by oblique loading in model M1, the maximum stress value increased to 116%in M2, but decreased to 74% and 71% in M3 and M4, respectively.In the cantilevered M2 model, the maximum stress values in the FDP were 851.5 and 908.4 MPa, respectively, by the vertical andoblique loadings, which are 5.1 and 7.1 times higher than the other models, respectively.The area of maximum stress in the implant was located around the area where the abutment screw and fixture were connected.Stress concentration was observed at an abutment screw by oblique load and at the top of the implant fixture by axial load.In the supporting bone, the maximum stress value increased to 120% in M2, but decreased to 69% and 63% in M3 and M4,compared to the stress in M1 by oblique load.Conclusions and Clinical Implications;The effect of staggered alignment on implant stress was negligible, but the cantilever design of the prosthesis and the number ofimplants had a greater impact on stress distrubution.
Download or read book Photoelastic Stress Analysis of the Bone Supporting a Dental Endosteal Implant written by Ronald A. Yapp and published by . This book was released on 1977 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In Vitro Bone Strain Analysis of Implant Occlusal Overload written by Janice Kan and published by . This book was released on 2011 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Testing of Orthopaedic Implants written by Elizabeth Friis and published by Woodhead Publishing. This book was released on 2017-05-24 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical Testing of Orthopaedic Implants provides readers with a thorough overview of the fundamentals of orthopedic implants and various methods of mechanical testing. Historical aspects are presented, along with case studies that are particularly useful for readers. - Presents information on a range of implants, from dental to spinal implants - Includes case studies throughout that help the reader understand how the content of the book is applied in practice - Provides coverage and guidance on FDA regulations and requirements - Focuses on application of mechanical testing methods
Download or read book In Vivo Strain Estimates for Medical Implants written by Matthew M. Quest and published by . This book was released on 2013 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anticipating the in vivo loading conditions is a challenging aspect of validating the design and durability of cardiovascular implants. Complex implant geometries, multi-axial displacements, device/tissue interactions, and time-dependent factors can make it difficult or impossible to identify a single loading cycle that is representative of the full range of conditions. Computational modeling is often used to reduce a large number of complex conditions into representative alternating and mean strains at locations of maximum strain. A novel approach for estimating the alternating and mean strains during in vivo loading will be presented. The method determines local strains by deforming a finite-element model of an implant into a three-dimensional geometry reconstructed from two-dimensional images of a physically deformed implant. The method is then extended to in vitro fatigue experiments. Two examples are given of a structural heart implant.
Download or read book Biomechanical Behavior Of Implants With Sloped Marginal Configuration written by M. Baris Guncu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Aims: Available data indicates that following the tooth loss; the alveolar buccal bone is more prone to resorption than lingual bone. Thus, the discrepancy occurs between buccal and lingual bone levels of the alveolar ridge that calls for the attention during the implant placement procedure. In order to avoid resective correction procedures, implants with altered neck design matching with the modified bone morphology were introduced. However, the biomechanical behavior of these implants remains unreported. In this study the effects of implant neck alteration on stress distribution of virtually placed implants, abutments and peri-implant bone using finite element methods were evaluated.Material and Methods: Three-dimensional mandibular model representing sloped alveolar ridge morphology with 2mm cortical bone thickness was created. Implants with two different neck designs (OsseoSpeed EV and OsseoSpeed Profile EV) (4.2mm diameter and 13mm length) were scanned using a high resolution Computed Tomography System. Finite element models were generated using these x-ray images. While no osteoplasty was applied to the Profile implant finite element model, bone-flattening procedure with 1.5mm osteoplasty was simulated for virtual standard implant placement in order to eliminate the discrepancy of bone levels in buccolingual aspects. Implants with abutments were subjected to 200 N both lingual and buccal static oblique occlusal loads. Results: Highest minimum principal stress value (91.9 MPa) in the cortical bone was detected around the standard implants when loaded oblique from buccal aspect. Profile implant model under oblique load with 30u00b0 buccal angulation showed higher Von Misses stress value (342 MPa) whereas minimum principal force was calculated as lower comparing to the standard implant model (-91.9 MPa)Conclusions: The results suggested that Profile implants placed in the alveolar ridges with buccolingual bone height discrepancy showed similar stress distribution and stress value outcomes compared with standard implants.
Download or read book A Device for Imposing Uniform Cyclic Strain to Cells Growing on Implant Alloys written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Since bone tissues grow in intimate contact with implant surfaces in vivo, there is a need to investigate how bone cells respond to mechanical loads adjacent to implants under well characterized loading conditions that stimulate the bone-implant surface. Thus, the objective of this study was to demonstrate an effective means for applying known, uniform, cyclic strain to cells growing on implant materials in vitro. A cell culture strain plate device was developed based on the application of the four-point bending principle. The device uses a small electric motor to drive belts attached to shafts which turn a set of cams. The cams are attached to pins which connect to a titanium plate which rests over arched supports. When deflected and depending on which set of cams are used, strains generated range from around 200 to 1000 ìstrain. UMR-106 osteoblast-like cells were cultured on the titanium plate, and the plate was deflected at three strain magnitudes at 1.5 Hz for durations of 4 and 24 hours. Strain gages recorded average maximum strain levels of 182 " 3, 366 " 9, and 984 " 7æstrain. The strain device, with attached cells, was tested in an amiable bioenvironment. Results from strain gages indicated a uniform strain field existed within the center region of the plate and culture area. Cells in the test plates stained viable, exhibited similar morphology to controls, and were assayed for alkaline phosphatase (ALP) activity, total protein production, and calcium deposition. Results also indicated that stretched cells exhibited increases in proliferation, as well as changes in ALP activity vs. unstrained controls. Thus, the device was successful in distinguishing differences in cell response to mechanical perturbations and may be used to investigate how cells respond to strains at implant-bone interfaces.
Download or read book A Device for Imposing Uniform Cyclic Strain to Cells Growing on Implant Alloys written by Larry Chad Winter and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Since bone tissues grow in intimate contact with implant surfaces in vivo, there is a need to investigate how bone cells respond to mechanical loads adjacent to implants under well characterized loading conditions that stimulate the bone-implant surface. Thus, the objective of this study was to demonstrate an effective means for applying known, uniform, cyclic strain to cells growing on implant materials in vitro. A cell culture strain plate device was developed based on the application of the four-point bending principle. The device uses a small electric motor to drive belts attached to shafts which turn a set of cams. The cams are attached to pins which connect to a titanium plate which rests over arched supports. When deflected and depending on which set of cams are used, strains generated range from around 200 to 1000 ìstrain. UMR-106 osteoblast-like cells were cultured on the titanium plate, and the plate was deflected at three strain magnitudes at 1.5 Hz for durations of 4 and 24 hours. Strain gages recorded average maximum strain levels of 182 ± 3, 366 ± 9, and 984 ± 7æstrain. The strain device, with attached cells, was tested in an amiable bioenvironment. Results from strain gages indicated a uniform strain field existed within the center region of the plate and culture area. Cells in the test plates stained viable, exhibited similar morphology to controls, and were assayed for alkaline phosphatase (ALP) activity, total protein production, and calcium deposition. Results also indicated that stretched cells exhibited increases in proliferation, as well as changes in ALP activity vs. unstrained controls. Thus, the device was successful in distinguishing differences in cell response to mechanical perturbations and may be used to investigate how cells respond to strains at implant-bone interfaces.
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 Removable Partial Dentures written by Olcay Şakar and published by Springer. This book was released on 2015-11-20 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: This clinical guide describes the latest developments in planning, materials, and techniques for successful fabrication of removable partial dentures (RPDs). The fabrication of RPDs is demonstrated in a simple and easy-to-understand format, with the aid of numerous color figures and video clips and scientific support on each page. Care has been taken to provide reliable guidance on all aspects of clinical practice relating to RPDs. Readers will find information on decision-making regarding treatment options, clasp-retained RPDs and esthetic solutions, attachments and double crown systems in RPDs, implant-assisted RPDs, maintenance and post-insertion problems for all types of RPDs, the role of RPDs in the management of temporomandibular disorders, re-establishing occlusal vertical dimension and maximal intercuspation.
Download or read book Endodontic Prognosis written by Nadia Chugal and published by Springer. This book was released on 2016-12-24 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book serves as a clinical guide to help the practitioner improve endodontic treatment outcomes. It focuses on the various factors affecting the prognosis of endodontic treatments and on their impact on short-term and long-term results. The text incorporates up-to-date knowledge, techniques and treatment protocols. Each chapter has been carefully chosen to address either foundational knowledge or a select aspect of endodontic treatment. The authors analyze the knowledge accumulated from a large number of outcome studies and provide the reader with a critical appraisal indicating the strengths and weaknesses of those studies. This information is then used to make recommendations on how to predict the outcome of the intended treatment. The authors emphasize that the endodontic prognosis is a multifactorial phenomenon, underscoring how various factors, singularly and in combination, influence the treatment outcome. Readers are provided with tools to successfully assess the prognosis of the proposed treatment at the outset and to execute the planned treatment focused on optimal outcome.
Download or read book Elements of Strength of Materials written by Stephen Timoshenko and published by . This book was released on 1962 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Basal Implantology written by Gérard M. Scortecci and published by Springer. This book was released on 2019-06-25 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual will help oral implantologists to understand the principles that underlie the use of basal implants as a means to provide simple solutions to complex and highly demanding clinical situations without the need for prior bone grafting. It will also serve as a richly illustrated practical guide to application of the technique. The book is in three parts, the first of which discusses basic principles and related themes, including osteogenesis, osseointegration, cortical anchorage stability, biomechanics, surgical techniques, and basal implant prosthodontics. Step-by-step guidance is then offered on the application of these principles, focusing on operating techniques, 3D treatment planning, transitional and final screw-secured prostheses, and postoperative follow-up. The third part of the book addresses a wide range of clinical situations that can be treated by basal implantology, with particular attention to the treatment of high, thin alveolar ridges and the atrophic maxilla and mandible and to the correction of previous implant failures, as well as complications and postimplantation neuropathies.
Download or read book A Clinical Guide to Removable Partial Denture Design written by John C. Davenport and published by . This book was released on 2000 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: All stages in the care of patients requiring removable partial dentures are important and the design of the prostheses needs as much skill and application as the others. This book looks at the process of design and includes a self-assessment section in which the reader can test his or her knowledge and understanding against an international team of expert prothosdontists. A companion volume to A Clinical Guide to Removable Partial Dentures by the same authors, this guide acts as a colour atlas to partial denture design, incorporating excellent artwork to illustrate the fine points of this skilful and vitally important aspect of patient dental care.
Download or read book Dental Implant Prosthetics E Book written by Carl E. Misch and published by Elsevier Health Sciences. This book was released on 2014-04-01 with total page 1009 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the foremost authority in the field, Dental Implants Prosthetics, 2nd Edition helps you advance your skills and understanding of implant prosthetics. Comprehensive coverage includes both simple and complicated clinical cases, with practical guidance on how to apply the latest research, diagnostic tools, treatment planning, implant designs, materials, and techniques to provide superior patient outcomes. - Treatment supported by clinical evidence equips students with a more targeted evidence-based approach to patient procedures. - NEW! Emphasis on treatment planning helps decrease the number of visits while providing effective, long-term results for the patient. - NEW! Focus on the patient presentation offers the latest treatment options for bone harvesting, restoration and recovery. - NEW! Original illustrations and photos highlight and clarify key clinical concepts and techniques.
Download or read book Innovative Perspectives in Oral and Maxillofacial Surgery written by Mark R. Stevens and published by Springer Nature. This book was released on 2021-07-30 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the latest technologies and developments in oral and maxillofacial surgery. It presents information in an easy-to-read format and meticulously details each surgical technique. Thorough and accurate chapters comprehensively present procedures and treatments step-by-step procedures objectively. Each chapter follows a consistent format of which includes the scientific documentation of the procedure through clinical studies, objective benefits for the patient, detailed explanations of the procedure, levels of treatment complexity according to the SAC (simple -advanced complex) classification, and cost-effectiveness of the procedure for the patient and clinician. Extensive images, figures, and tables supplement select chapters to aid in visual learning. Extensive and unique, Innovative Perspectives in Oral and Maxillofacial Surgery is a vital tool for all dental specialists ranging from undergraduate students to established oral maxillofacial surgeons.
