18,715 results match your criteria metal implant

Prevalence and Outcomes of Unexpected Positive Intraoperative Cultures in Presumed Aseptic Revision Hip Arthroplasty.

J Bone Joint Surg Am 2021 May 11. Epub 2021 May 11.

Division of Orthopaedic Surgery, Department of Surgery, Schulich School of Medicine & Dentistry, Western University and London Health Science Centre, London, Ontario, Canada.

Background: The prevalence and outcomes of unexpected positive cultures (UPCs) of specimens taken during presumed aseptic revision total hip arthroplasty (THA) are unclear. The purpose of this study was to determine the prevalence of UPC and infection-free implant survival in this patient population. Secondary aims included identifying factors associated with subsequent infection-related failure in patients with UPC. Read More

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Mechanical properties and fluid permeability of gyroid and diamond lattice structures for intervertebral devices: functional requirements and comparative analysis.

Sci Technol Adv Mater 2021 Apr 21;22(1):285-300. Epub 2021 Apr 21.

Department of Mechanical Engineering, École de Technologie Supérieure, Montreal, Quebec, Canada.

Current intervertebral fusion devices present multiple complication risks such as a lack of fixation, device migration and subsidence. An emerging solution to these problems is the use of additively manufactured lattice structures that are mechanically compliant and permeable to fluids, thus promoting osseointegration and reducing complication risks. Strut-based diamond and sheet-based gyroid lattice configurations having a pore diameter of 750 µm and levels of porosity of 60, 70 and 80% are designed and manufactured from Ti-6Al-4V alloy using laser powder bed fusion. Read More

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Framework Fracture of Zirconia Supported Full Arch Implant Rehabilitation: A Retrospective Evaluation of Cantilever Length and Distal Cross-Sectional Connection Area in 140 Patients Over an Up-To-7 Year Follow-Up Period.

J Prosthodont 2021 May 8. Epub 2021 May 8.

Freelance statistician, Ferrara, Italy.

Purpose: To evaluate the relationship between different dimensional parameters in implant-supported monolithic zirconia fixed complete dental prostheses (IFCDPs) and the incidence of framework fracture in a large sample of cases in-vivo.

Materials And Methods: This retrospective observational study evaluated all patients rehabilitated with screw-retained zirconia IFCDPs between January 2013 and April 2019 at a private practice. The minimum follow-up period was 1 year after occlusal loading. Read More

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Osseointegration of porous titanium and tantalum implants in ovariectomized rabbits: A biomechanical study.

World J Orthop 2021 Apr 18;12(4):214-222. Epub 2021 Apr 18.

Department of Orthopedic Surgery, NYU Langone Orthopedic Hospital, Hospital for Joint Diseases, New York, NY 10003, United States.

Background: Today, biological fixation of uncemented press-fit acetabular components plays an important role in total hip arthroplasty. Long-term stable fixation of these implants depends on the osseointegration of the acetabular cup bone tissue into the acetabular cup implant, and their ability to withstand functional loads.

Aim: To compare the strength of bone-implant osseointegration of four types of porous metal implants in normal and osteoporotic bone in rabbits. Read More

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Lateral unicompartmental knee arthroplasty: A review.

World J Orthop 2021 Apr 18;12(4):197-206. Epub 2021 Apr 18.

Department of Orthopaedic Surgery, NYU Langone Health, New York, NY 10016, United States.

Isolated lateral compartment osteoarthritis of the knee is a rare condition affecting approximately 1% of the population, which is ten times less common than osteoarthritis affecting only the medial compartment. Unicompartmental knee arthroplasty (UKA) has many potential advantages over total knee arthroplasty. The benefits of UKA include a smaller incision, preservation of more native tissue (including cruciate ligaments and bone), decreased blood loss, and better overall proprioception. Read More

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A Clinical Case Report of a Potential Acute Allergic Reaction with Titanium Dental Implant.

Case Rep Dent 2021 10;2021:5592934. Epub 2021 Apr 10.

Department of Periodontology, College of Dentistry, University of Florida, USA.

Titanium hypersensitivity is rare, but it may exist among patients who need dental implant treatment. It could contribute to mild or severe peri-implant tissue hypersensitivity reactions and affect patients' oral and general health according to some clinical reports. In extreme cases, it may lead to implant failure or extraction. Read More

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Multiacquisition Variable-Resonance Image Combination Selective Can Improve Image Quality and Reproducibility for Metallic Implants in the Lumbar Spine.

Acta Med Okayama 2021 Apr;75(2):187-197

Department of Radiology, Okayama Central Hospital.

The aim of this study is to evaluate how metallic artifacts in the lumbar spine can affect images obtained from magnetic resonance (MR) sequences. We performed a phantom experiment by scanning an agar containing an orthopedic metallic implant using 64-channel multidetector row computed tomography (CT) and a 3-tesla MR unit. We compared the reproducibility in each measurement, enlargement or reduction ratio of the CT and MR measurements, and signal deviation in each voxel from the control. Read More

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The Potential of Calcium/Phosphate Containing MAO Implanted in Bone Tissue Regeneration and Biological Characteristics.

Int J Mol Sci 2021 Apr 29;22(9). Epub 2021 Apr 29.

Combination Medical Device Technology Division, Medical Devices R&D Service Department, Metal Industries Research & Development Centre, Kaohsiung 802, Taiwan.

Micro arc oxidation (MAO) is a prominent surface treatment to form bioceramic coating layers with beneficial physical, chemical, and biological properties on the metal substrates for biomaterial applications. In this study, MAO treatment has been performed to modify the surface characteristics of AZ31 Mg alloy to enhance the biocompatibility and corrosion resistance for implant applications by using an electrolytic mixture of Ca(PO) and CHNO (EDTA) in the solutions. For this purpose, the calcium phosphate (Ca-P) containing thin film was successfully fabricated on the surface of the implant material. Read More

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Matched retrospective analysis of three different fixation devices for chevron osteotomy.

Foot (Edinb) 2021 Jan 21;47:101779. Epub 2021 Jan 21.

Department of Orthopaedics of Herz Jesu Krankenhaus Vienna, Baumgasse 20A, 1030 Wien, Austria.

Chevron osteotomy with consecutive fixation is a commonly performed operative treatment option for hallux valgus deformities. The present retrospective study aims to compare the clinical and radiological outcome of novel bioabsorbable magnesium screw fixation with metal screw and Kirschner wire fixation. Eighteen matched triplets were assembled according to the following criteria: female gender, age difference less than 5 years, date of operation within 4 months, difference in preoperative intermetatarsal angle less than 5°, and equal experience of the first and second surgeon. Read More

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January 2021

Despite higher revision rate, MoM large-head THA offers better clinical scores than HR: 14-year results from a randomized controlled trial involving 48 patients.

BMC Musculoskelet Disord 2021 Apr 30;22(1):400. Epub 2021 Apr 30.

Surgery Department, Hôpital Maisonneuve-Rosemont, Montreal University, 5415 Boulevard de l'Assomption, Montréal, Québec, H1T 2M4, Canada.

Background: The high failure rates of metal on metal (MoM) large diameter head total hip arthroplasty (LDH THA) and hip resurfacing (HR) prevented their long-term comparisons with regards to clinical outcome. Such knowledge would be important as ceramic LDH bearing is now available. With long-term follow-up, we investigated the difference in 1) patient-reported outcome measures (PROMs); 2) revision and adverse events rates, and 3) metal ion levels between MoM LDH THA and HR. Read More

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Metal-On-Metal versus Metal-On-Plastic Artificial Discs in Two-Level Anterior Cervical Disc Replacement: A Meta-Analysis with Follow-Up of 5 Years or More.

Spine J 2021 Apr 30. Epub 2021 Apr 30.

St. Joseph's University Medical Center, Department of Orthopaedic Surgery, 703 Main Street, Paterson, NJ 07503. Electronic address:

Background Context: Although highlighted in joint arthroplasty studies, long-term outcomes between differing biomaterial composites, such as metal-on-metal (MoM) and metal-on-plastic (MoP) in anterior cervical disc replacement (ACDR) have not been thoroughly investigated.

Purpose: The purpose of this study was to evaluate the patient-reported clinical outcomes, overall reoperation rates, complications, and rates of ASD of MoM versus MoP artificial discs in two-level ACDR for the treatment of cervical DDD.

Study Design/setting: Meta-analysis and systematic review PATIENT SAMPLE: 980 patients (442 MoM, 538 MoP) across 7 studies OUTCOME MEASURES: Patient reported clinical outcomes (NDI, VAS-n, VAS-a), overall reoperation rates, complications and rates of ASD METHODS: A systematic search strategy of three electronic databases (PubMed, CINAHL Plus, and SCOPUS) was conducted utilizing terms related to two-level ACDR. Read More

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Digital Workflow for Full-Arch Immediate Implant Placement Using a Stackable Surgical Guide Fabricated Using SLM Technology.

J Prosthodont 2021 May 2. Epub 2021 May 2.

Division of Restorative Dental Sciences, Department of Clinical Sciences, College of Dentistry, Ajman University, Ajman City, UAE.

The failing dentition of partially edentulous individuals may be used as an initial reference for stackable restrictive surgical guides during full-arch immediate implant placement. The stackable guide option derived from a digital workflow increases the predictability of the performance of bone reduction, immediate implant placement, and immediate loading of provisional implant-supported fixed dental prostheses. The present paper aims to report a practical approach to design and produce a metal framework with occlusal rests to facilitate the use of a tooth-supported surgical guide when full-arch immediate implant placement is indicated in patients with failing dentition. Read More

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Anatomical pelvic loading of a monoblock polyethylene acetabular component.

Bone Joint J 2021 May;103-B(5):872-880

Department of Orthopaedics, Queen Elizabeth University Hospital, Glasgow, UK.

Aims: Uncemented metal acetabular components show good osseointegration, but material stiffness causes stress shielding and retroacetabular bone loss. Cemented monoblock polyethylene components load more physiologically; however, the cement bone interface can suffer fibrous encapsulation and loosening. It was hypothesized that an uncemented titanium-sintered monoblock polyethylene component may offer the optimum combination of osseointegration and anatomical loading. Read More

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Allergy Testing Has No Correlation with Intraoperative Histopathology from Revision Total Knee Arthroplasty for Implant-Related Metal Allergy.

J Knee Surg 2021 May 1. Epub 2021 May 1.

Stavros Niarchos Foundation Complex Joint Reconstruction Center, Hospital for Special Surgery, New York, New York.

Lymphocyte transformation testing (LTT) is often used in the workup for possible metal allergy after total knee arthroplasty (TKA) but the correlation of this test with other diagnostic metal-allergy findings in patients undergoing revision TKA for suspected metal allergy has not been established. A single-center, single-surgeon cohort of 19 TKAs in which both components were revised for presumed implant-related metal allergy based on history, physical, and LTT testing, to nonnickel-containing implants were retrospectively identified. Histopathologic samples obtained intraoperatively were semiquantitatively analyzed using both the Hospital for Special Surgery (HSS) synovial pathology score and the Campbell aseptic lymphocyte-dominant vasculitis-associated lesion (ALVAL) score. Read More

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Drug diffusivities in nanofibrillar cellulose hydrogel by combined time-resolved Raman and fluorescence spectroscopy.

J Control Release 2021 Apr 28;334:367-375. Epub 2021 Apr 28.

Circuits and Systems Research Unit, University of Oulu, 90014 Oulu, Finland. Electronic address:

Hydrogels, natural and synthetic origin, are actively studied for their use for implants and payload carriers. These biomaterials for delivery systems have enormous potential in basic biomedical research, drug development, and long-term delivery of biologics. Nanofibrillated cellulose (NFC) hydrogels, both natural and anionic (ANFC) ones, allow drug loading for immediate and controlled release via the slow drug dissolution of solid drug crystals into hydrogel and its subsequent release. Read More

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Implant removal of osteosynthesis. Results of a survey among Spanish orthopaedic surgeons.

Rev Esp Cir Ortop Traumatol 2021 Apr 26. Epub 2021 Apr 26.

Servicio de Cirugía Ortopédica y Traumatología, Hospital Universitario Marqués de Valdecilla, Santander, España.

Introduction: The indications on extraction of osteosynthesis material are not well defined in the current literature deriving in relative indications, depending on experiences, customs or patient's request. The aim of this article is to assess the beliefs, indications, usual practice and perceived complications of surgeons in Spain regarding on extraction of osteosynthesis material.

Methods: We conducted a questionnaire of 44 questions covering general demographics, general and subjective opinion on implant removal, specific attitudes by implant type and anatomical location, and personal habits. Read More

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Inorganic Nanoparticles and Composite Films for Antimicrobial Therapies.

Int J Mol Sci 2021 Apr 27;22(9). Epub 2021 Apr 27.

Department of Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 011061 Bucharest, Romania.

The development of drug-resistant microorganisms has become a critical issue for modern medicine and drug discovery and development with severe socio-economic and ecological implications. Since standard and conventional treatment options are generally inefficient, leading to infection persistence and spreading, novel strategies are fundamentally necessary in order to avoid serious global health problems. In this regard, both metal and metal oxide nanoparticles (NPs) demonstrated increased effectiveness as nanobiocides due to intrinsic antimicrobial properties and as nanocarriers for antimicrobial drugs. Read More

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Polyoxymethylene as Material for Removable Partial Dentures-A Literature Review and Illustrating Case Report.

J Clin Med 2021 Apr 2;10(7). Epub 2021 Apr 2.

Department of Prosthodontics and Materials Science, University of Leipzig, Liebigstr. 12, 04103 Leipzig, Germany.

Compared to thermoplastic manufacturing techniques, computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies make it easier to process modern restorative and prosthetic materials with improved material properties. In dentistry, tooth-colored alternatives to metal-based frameworks for application in removable dental prostheses (RDP) emerged. With regard to this aspect, the current article provides an overview of the specific material properties of polyoxymethylene (POM). Read More

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Electrocautery-induced molten metal particle generation from total joint replacements: Morphology and chemistry.

J Biomed Mater Res B Appl Biomater 2021 Apr 29. Epub 2021 Apr 29.

Department of Bioengineering, Clemson University, Clemson, South Carolina, USA.

Electrosurgical techniques are used during surgery to cauterize, and their damaging effects have primarily been documented in terms of tissue necrosis, charring, and localized heat accumulation. Metallic implants as well as the surgical blade can experience incidental electrosurgical current arcing that results in the generation and transfer of melted metallic particles. This work examines the composition, particle size distribution, and chemical state of the melted alloy surfaces and particles produced in vitro. Read More

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Fracture Resistance of Zirconia, Polyetheretherketone, and Polyetherketoneketone Implant Abutments After Aging.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):332-340

Purpose: This study aimed to assess the fracture resistance of zirconia (Zr), reinforced polyetheretherketone (PEEK), and polyetherketoneketone (PEKK) implant abutments restored with glass-ceramic crowns after thermomechanical aging.

Materials And Methods: Zr, reinforced PEEK, and PEKK titanium base abutments were divided into three groups (n = 10). CAD/CAM maxillary central incisor crowns were fabricated using monolithic lithium disilicate and luted to the abutments using resin cement. Read More

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Mechanical Stability of Restorations Supported by Titanium Base, Zirconia, and Polyetherketoneketone Abutments on One- and Two-Piece Zirconia Implants.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):313-321

Purpose: To evaluate survival, complication rates, and bending moments of one- and two-piece zirconia implants restored with different abutment materials and lithium disilicate crowns after aging, compared to titanium implants restored with titanium base-supported lithium disilicate crowns.

Materials And Methods: Sixty anterior crowns were either screwretained on two-piece titanium implants (C) and two-piece zirconia implants (T1, T2, T3) or cemented on one-piece zirconia implants (T4), resulting in 5 groups with 12 specimens each. For the screw-retained crowns, different abutment materials and implant connections were tested: titanium base with internal conical connection and horizontal joint component (C and T2), zirconia with internal hexagonal connection and horizontal joint component (T1), and polyetherketoneketone with internal hexagonal connection and horizontal joint component (T3). Read More

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In Vitro Efficacy of Three Different Nonsurgical Implant Surface Decontamination Methods in Three Different Defect Configurations.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):271-280

Purpose: Assessment of in vitro efficacy of three different nonsurgical implant surface decontamination methods in three peri-implant bone defect simulation models.

Materials And Methods: A total of 180 implants were allocated to differently angulated (30, 60, and 90 degrees) peri-implant bone defect resin models, each covered by a mucosa mask. All implants were stained with indelible red color and assigned to one of the three defect models. Read More

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[The effect of low-magnitude high-frequency loading on peri-implant bone healing and implant osseointegration in Beagle dogs].

Shanghai Kou Qiang Yi Xue 2021 Feb;30(1):17-22

School of Stomatology, Zhejiang Chinese Medical University. Hangzhou 310053, Zhejiang Province, China.

Purpose: Low-magnitude, high-frequency(LMHF) loading has been confirmed to play an important role in bone healing. The present study aimed to evaluate the effect of LMHF loading applied directly to titanium dental implants on peri-implant bone healing and implant.

Methods: The mandibular premolars and molars were extracted from six male Beagle dogs. Read More

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February 2021

A Novel Digital Implant Planning Workflow in Patients with Pre-existing Metal Restorations: A Technical Report.

J Prosthodont 2021 Apr 26. Epub 2021 Apr 26.

Paul Ro Dental Laboratory, Burnaby, BC, Canada.

A prosthetic-driven virtual implant plan is considered a challenging procedure depending on accurate registration of the three-dimensional optical surface scan and 3D volumetric rendering reconstructed from cone-beam computed tomography (CBCT) images. However, the presence of pre-existing metal restorations may significantly negatively influence the registration process. This technical report describes a novel digital workflow to optimize the implant planning outcome for the partially edentulous patient with pre-existing metal restorations by accurately aligning the standard triangle language data of the intraoral scanner with the CBCT rendering using a dual-scan technique and an appliance with radiographic markers. Read More

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Three-dimensional-printed individualized porous implants: A new "implant-bone" interface fusion concept for large bone defect treatment.

Bioact Mater 2021 Nov 6;6(11):3659-3670. Epub 2021 Apr 6.

Department of Orthopedics, Peking University Third Hospital, Beijing, 100191, People's Republic of China.

Bone defect repairs are based on bone graft fusion or replacement. Current large bone defect treatments are inadequate and lack of reliable technology. Therefore, we aimed to investigate a simple technique using three-dimensional (3D)-printed individualized porous implants without any bone grafts, osteoinductive agents, or surface biofunctionalization to treat large bone defects, and systematically study its long-term therapeutic effects and osseointegration characteristics. Read More

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November 2021

The occurrence of osteosarcoma after tibial fracture repair in a dog.

Open Vet J 2021 Jan-Mar;11(1):11-13. Epub 2021 Jan 8.

Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Japan.

Background: There are few detailed reports on implant-associated sarcoma in dogs; however, loose implants, metal type, and infection have not been shown as specific risk factors for this condition.

Case Description: A 14-year-old spayed female Labrador retriever was referred to our hospital with a main complaint of chronic right hind lameness after previous tibial fracture repair. On radiographs, rupture of the bone plate and screws with swelling of the surrounding soft tissue was observed, and osteosarcoma (OSA) was diagnosed after histopathological examinations. Read More

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January 2021

Metallic-nanoparticle release systems for biomedical implant surfaces: effectiveness and safety.

Nanotoxicology 2021 Apr 24:1-19. Epub 2021 Apr 24.

Programa de Pós-Graduação em Odontologia, Escola de Ciências da Saúde e da Vida, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil.

The current focus of bioengineering for implant devices involves the development of functionalized surfaces, bioactive coatings, and metallic nanoparticles (mNPs) with a controlled release, together with strategies for the application of drugs , aiming at reducing infection rates, with an improvement of clinical outcomes. Controversially, negative aspects, such as cytotoxicity, mNP incorporation, bioaccumulation, acquired autoimmunity, and systemic toxicity have gained attention at the same status of importance, concerning the release of mNPs from these surface systems. The balance between the promising prospects of system releasing mNPs and the undesirable long-term adverse reactions require further investigation. Read More

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Catastrophic wear in uncemented acetabular cups after Total Hip Arthroplasty. A case series.

Int J Surg Case Rep 2021 Apr 30;81:105846. Epub 2021 Mar 30.

Unidad Médica De Alta Especialidad Hospital De Traumatología Y Ortopedia "Lomas Verdes", Mexico City, Mexico.

Introduction: Catastrophic wear is a rare outcome following Total Hip Arthroplasty (THA), documented to happen in less than 0.5% of THA. We present 5 cases of revision THA performed successfully on 5 patients presenting Catastrophic wear, following Total Hip Arthroplasty (THA). Read More

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Carotid Artery Atherosclerotic Profile as Risk Predictor for Restenosis After Coronary Stenting.

Arq Bras Cardiol 2021 Apr;116(4):727-733

Universidade Estadual Paulista Julio de Mesquita Filho - Faculdade de Medicina Campus de Botucatu, Botucatu, SP - Brasil.

Background: The incidence of restenosis of the coronary artery after a bare-metal stent implant has been lower than in simple balloon angioplasty; however, it still shows relatively high rates.

Objective: The aim of this study was to find new risk indicators for in-stent restenosis using carotid ultrasonography, that, in addition to the already existing indicators, would help in decision-making for stent selection.

Methods: We carried out a cross-sectional prospective study including 121 consecutive patients with chronic coronary artery disease who had undergone percutaneous coronary intervention with repeat angiography in the previous 12 months. Read More

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Controlled biodegradation of magnesium alloy in physiological environment by metal organic framework nanocomposite coatings.

Sci Rep 2021 Apr 21;11(1):8645. Epub 2021 Apr 21.

Department of Nanobiotechnology, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-154, Tehran, Iran.

Magnesium-based implants (MBIs) have recently attracted great attention in bone regeneration due to elastic modulus similar to bone. Nevertheless, the degradation rate and hydrogen release of MBIs in the body have to be tackled for practical applications. In the present study, we present a metal-organic framework (MOF) nanoplates to reduce the degradation rate of AZ91 magnesium alloy. Read More

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