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https://www.readbyqxmd.com/read/29775558/reconstructing-a-traumatic-empty-orbit-principles-difficulties-of-treatment-and-literature-review
#1
REVIEW
Panagiotis Stathopoulos, Philip Ameerally
PURPOSE: This report describes the case of a serious orbital injury in which the globe was completely displaced into the nasal cavity and the orbit was clinically empty. The authors discuss the difficulties encountered in the management of this patient and their principles in the reconstruction of a complex defect. MATERIALS AND METHODS: In this rare case of severe injury, the authors used a combined transconjunctival and ethmoidal approach to retrieve the displaced globe from the nasal cavity...
April 21, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29773278/medial-tibial-periprosthetic-bone-resorption-and-its-effect-on-clinical-outcomes-after-total-knee-arthroplasty-cobalt-chromium-vs-titanium-implants
#2
Chan Yoon, Moon Jong Chang, Chong Bum Chang, Min Kyu Song, Jae Hoon Shin, Seung-Baik Kang
BACKGROUND: Recently, concerns arose over the medial tibial bone resorption of a novel cobalt-chromium implant. This study aimed at investigating the effects of tibial component material, design, and patient factors on periprosthetic bone resorption and at determining its association with clinical outcomes after total knee arthroplasty (TKA). METHODS: A total of 462 primary TKAs using 5 types of implants were included. To evaluate tibial periprosthetic bone resorption, we assessed radiolucent lines and change in bone mineral density at the medial tibial condyle (BMDMT )...
April 23, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29772348/biosafety-stability-and-osteogenic-activity-of-novel-implants-made-of-zr-70-ni-16-cu-6-al-8-bulk-metallic-glass-for-biomedical-application
#3
Hiroto Ida, Masahiro Seiryu, Nobuo Takeshita, Masanari Iwasaki, Yoshihiko Yokoyama, Yusuke Tsutsumi, Etsuko Ikeda, Satoshi Sasaki, Shunro Miyashita, Shutaro Sasaki, Tomohiro Fukunaga, Toru Deguchi, Teruko Takano-Yamamoto
Superior mechanical and chemical properties of Zr70 Ni16 Cu6 Al8 bulk metallic glass (BMG) demonstrate its promise as a novel biomaterial for fabrication of implants. The aim of the present study was to validate mechanical, chemical, and biological properties of Zr70 Ni16 Cu6 Al8 BMG through comparison with titanium (Ti). Our data indicated higher tensile strength, lower Young's modulus, and reduced metal ion release of Zr70 Ni16 Cu6 Al8 BMG compared with Ti. Biosafety of bone marrow mesenchymal cells on Zr70 Ni16 Cu6 Al8 BMG was comparable to that of Ti...
May 14, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29772190/serum-metal-levels-in-maxillofacial-reconstructive-surgery-patients-a-pilot-study
#4
Louis G Mercuri, Michael Miloro, Anastasia K Skipor, Divya Bijukumar, Cortino Sukotjo, Mathew T Mathew
PURPOSE: The aim of this pilot study was to assay metal concentrations in the serum of patients who had undergone dental implant placement, orthognathic surgery using rigid metal fixation plates and screws, and total temporomandibular joint replacement (TMJ TJR). MATERIALS AND METHODS: Thirty patients were identified and included in this pilot study. Sixteen patients (9 men and 8 women), with an average age of 44 years (range, 19 to 79 yr), provided informed consent to participate and were divided into 3 study groups with 4 patients in each (group 1, orthognathic surgery; group 2, TMJ TJR; and group 3, dental implant placement)...
April 21, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29771925/in-vitro-and-in-vivo-biological-performance-of-porous-ti-alloys-prepared-by-powder-metallurgy
#5
Renata Falchete do Prado, Gabriela Campos Esteves, Evelyn Luzia De Souza Santos, Daiane Acácia Griti Bueno, Carlos Alberto Alves Cairo, Luis Gustavo Oliveira De Vasconcellos, Renata Silveira Sagnori, Fernanda Bastos Pereira Tessarin, Felipe Eduardo Oliveira, Luciane Dias De Oliveira, Maria Fernanda Lima Villaça-Carvalho, Vinicius André Rodrigues Henriques, Yasmin Rodarte Carvalho, Luana Marotta Reis De Vasconcellos
Titanium (Ti) and Ti-6 Aluminium-4 Vanadium alloys are the most common materials in implants composition but β type alloys are promising biomaterials because they present better mechanical properties. Besides the composition of biomaterial, many factors influence the performance of the biomaterial. For example, porous surface may modify the functional cellular response and accelerate osseointegration. This paper presents in vitro and in vivo evaluations of powder metallurgy-processed porous samples composed by different titanium alloys and pure Ti, aiming to show their potential for biomedical applications...
2018: PloS One
https://www.readbyqxmd.com/read/29771856/vitamin-e-phosphate-coating-stimulates-bone-deposition-in-implant-related-infections-in-a-rat-model
#6
Arianna B Lovati, Marta Bottagisio, Susanna Maraldi, Martina B Violatto, Monica Bortolin, Elena De Vecchi, Paolo Bigini, Lorenzo Drago, Carlo L Romanò
BACKGROUND: Implant-related infections are associated with impaired bone healing and osseointegration. In vitro antiadhesive and antibacterial properties and in vivo antiinflammatory effects protecting against bone loss of various formulations of vitamin E have been demonstrated in animal models. However, to the best of our knowledge, no in vivo studies have demonstrated the synergistic activity of vitamin E in preventing bacterial adhesion to orthopaedic implants, thus supporting the bone-implant integration...
June 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29771829/repairing-a-facial-cleft-by-polyether-ether-ketone-implant-combined-with-titanium-mesh
#7
Yuan Deng, Weiwei Tang, Zhengkang Li
The Tessier Number 4 cleft is one of the rarest, most complex craniofacial anomalies that presents difficulties in surgical treatment. In this article, we report a case of simultaneous facial depression, eye displacement, and medial canthus deformity. In this case, the maxillary bony defect was reconstructed using computer-assisted design computer-assisted manufacturing (CAD-CAM) polyether-ether-ketone (PEEK) material, and the orbital floor defect was repaired with AO prefabricated titanium mesh. Additionally, the medial canthus was modified with canthopexy and a single Z-plasty flap...
May 15, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29768185/a-simple-inexpensive-method-for-subcortical-stereotactic-targeting-in-nonhuman-primates
#8
J Nicole Bentley, Siri S S Khalsa, Michael Kobylarek, Karen E Schroeder, Kevin Chen, Ingrid L Bergin, Derek M Tat, Cynthia A Chestek, Parag G Patil
BACKGROUND: Many current neuroscience studies in large animal models have focused on recordings from cortical structures. While sufficient for analyzing sensorimotor systems, many processes are modulated by subcortical nuclei. Large animal models, such as nonhuman primates (NHP), provide an optimal model for studying these circuits, but the ability to target subcortical structures has been hampered by lack of a straightforward approach to targeting. NEW METHOD: Here we present a method of subcortical targeting in NHP that uses MRI-compatible titanium screws as fiducials...
May 13, 2018: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29766675/interactions-between-monocytes-mesenchymal-stem-cells-and-implants-evaluated-using-flow-cytometry-and-gene-expression
#9
Maria Lennerås, Karin Ekström, Forugh Vazirisani, Furqan A Shah, Katarina Junevik, Peter Thomsen, Omar Omar
Monocytes and mesenchymal stem cells (MSC) are evident at the implants during early healing. However, when coexisting, their interactions at different implants have not been determined. This study uses an in vitro system, consisting of mono- and direct co-cultures of monocytes and MSC on screw-shaped machined and oxidized titanium implants in combination with scanning electron microscopy, ELISA, flow cytometry, cell sorting, and qPCR. The cell-specific adhesion and gene expression of monocytes and MSC was determined...
May 15, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29765680/the-relationship-between-substrate-morphology-and-biological-performances-of-nano-silver-loaded-dopamine-coatings-on-titanium-surfaces
#10
Weibo Zhang, Shuang Wang, Shaohua Ge, Jialong Chen, Ping Ji
Biomedical device-associated infection (BAI) and lack of osseointegration are the main causes of implant failure. Therefore, it is imperative for implants not only to depress microbial activity and biofilm colonization but also to prompt osteoblast functions and osseointegration. As part of the coating development for implants, the interest of in vitro studies on the interaction between implant substrate morphology and the coating's biological performances is growing. In this study, by harnessing the adhesion and reactivity of bioinspired polydopamine, nano-silver was successfully anchored onto micro/nanoporous as well as smooth titanium surfaces to analyse the effect of substrate morphology on biological performances of the coatings...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29764301/bioinspired-biocompatible-and-peptide-decorated-silk-fibroin-coatings-for-enhanced-osteogenesis-of-bioinert-implant
#11
Chunyan Wang, Shengnan Wang, Yuanyi Yang, Zhuo Jiang, Yi Deng, Shaoli Song, Weizhong Yang, Zhi-Gang Chen
In this study, we develop an osteopromotive polyetheretherketone (PEEK) implant decorated with silk fibroin and bone forming peptide, in which the surface of bioinert PEEK implant is firstly sulfonated to form a three-dimensional, porous topography and then is functionalized with silk fibroin via spin-coating process and peptide decoration. The bio-test results show that cells on the functional bioinert implants exhibit better cell adhesion, proliferation and spreading, when compared with the uncoated ones...
May 15, 2018: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/29763505/influence-of-alveolar-bone-defects-on-the-stress-distribution-in-quad-zygomatic-implant-supported-maxillary-prosthesis
#12
Yuanyuan Duan, Ravi Chandran, Denise Cherry
PURPOSE: The purpose of this study was to create three-dimensional composite models of quad zygomatic implant-supported maxillary prostheses with a variety of alveolar bone defects around implant sites, and to investigate the stress distribution in the surrounding bone using the finite element analysis (FEA) method. MATERIALS AND METHODS: Three-dimensional models of titanium zygomatic implants, maxillary prostheses, and human skulls were created and assembled using Mimics based on microcomputed tomography and cone beam computed tomography images...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29763497/additively-manufactured-titanium-and-cobalt-chromium-implant-frameworks-fit-and-effect-of-ceramic-veneering
#13
Per Svanborg, Alf Eliasson, Victoria Stenport
PURPOSE: The purpose of this study was to evaluate the fit of additively manufactured cobalt-chromium and titanium and CNC-milled titanium frameworks before and after ceramic veneering. MATERIALS AND METHODS: Ten stone casts simulating an edentulous maxilla provided with six abutment analogs were produced. For each stone cast, one additively manufactured cobalt-chromium framework (AM CoCr) and one titanium framework (AM Ti) were fabricated. The fit was analyzed with a coordinate measuring machine in three dimensions (x, y, and z axes) using best-fit virtual matching of center point coordinates, before and after ceramic veneering...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29763495/early-response-of-fibroblasts-and-epithelial-cells-to-pink-shaded-anodized-dental-implant-abutments-an-in-vitro-study
#14
Federico Mussano, Tullio Genova, Marco Laurenti, Elisa Zicola, Luca Munaron, Paola Rivolo, Pietro Mandracci, Stefano Carossa
PURPOSE: This research aimed to assess whether pink-shaded anodized surfaces could enhance the adhesion of soft tissue cells compared with untreated machined titanium surfaces. MATERIALS AND METHODS: Two types of Ti-Al-V titanium samples were prepared: machined titanium (Ti) and anodized titanium (AnoTi). The microstructure was studied by means of a scanning electron microscope. X-ray photoelectron spectroscopy (XPS) was carried out as well. The wetting properties were investigated by the sessile drop technique with water and diiodomethane...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29763362/fracture-strength-and-precision-of-fit-of-implant-retained-monolithic-zirconia-crowns
#15
Pauliina Moilanen, Jenni Hjerppe, Lippo Lassila, Timo Närhi
OBJECTIVES: To examine fracture strength and precision of fit of screw-retained anterior monolithic zirconia crowns made directly on implants or by cementing on prefabricated titanium bases, and to compare these to industrially produced Procera crowns. . MATERIALS AND METHODS: Monolithic screw-retained implant crowns were produced by CAD/CAM method (Zirkonzahn, Italy) using either partially (PSZ, Prettau, Zirconzahn, Italy) or fully stabilized (FSZ, Prettau Anterior, Zirkonzahn) zirconia...
May 15, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29763360/three-dimensional-finite-element-analisys-of-stress-distribution-in-zirconia-and-titanium-dental-implants
#16
Camilo Andres Villabona, Marco Antônio Amorin Vasco, Edwin Ruales, Karin Apaza Bedoya, Cesar Magalhães Benfatti, Osvaldo Luis Bezzon, Tatiana Miranda Deliberador
Zirconia has been presented as an alternative biomaterial to titanium, commercially presented as a single body implant and / or as an abutment, demonstrating clinically biocompatible favorable results in white and rose aesthetics, However, the amount of long-term in-vivo studies and mechanical tests evaluating the response of stress distribution compared with titanium implants are still limited. The aim of the study was to compare by the finite element method, the principal stresses peaks in the peri implantar bone around titanium and zirconia implants...
May 15, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29762818/titanium-alloy-vs-stainless-steel-miniscrews-an-in-vivo-split-mouth-study
#17
P Bollero, V Di Fazio, C Pavoni, M Cordaro, P Cozza, R Lione
OBJECTIVE: To compare in vivo Titanium Alloy (TiA) with Stainless Steel (SS) miniscrews Temporary Anchorage Devices (TADs) using removal torque and Scanning Electron Microscopic (SEM) analysis. PATIENTS AND METHODS: 15 subjects (6 males and 9 females) who required maximum anchorage were recruited. For each patient, a TiA TAD and a SS TAD with same length and width were implanted following a randomized split-mouth study design. Retraction was carried out with nickel-titanium spring ligated directly from the anterior hooks of the archwire to the TADs to produce 90 to 100 g of force...
April 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29761982/-study-on-the-geometric-characteristics-and-distribution-of-porosities-in-three-dimensional-printed-ti-6al-4v-titanium-alloy
#18
Zhipeng Wan, Wentao Jiang, Chong Wang, Qingyuan Wang, Yalan Li
Three dimensional (3D) printing is considered as an advanced manufacturing technology because of its additive nature. Electron beam melting (EBM) is a widely used 3D printing processes for the manufacturing of metal components. However, the products printed via this process generally contain micro porosities which affect mechanical properties, especially the fatigue property. In this paper, two types of EBM printed samples of the Ti-6Al-4V alloy, one with a round cross section and the other with a triangle cross section, were employed to investigate the existence of porosities using computed tomography (CT)...
October 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29756511/surface-integrity-of-polyethylene-liners-following-trunnionosis-of-a-dual-modular-neck-total-hip-implant
#19
Ben Gi Spiegelberg, Brent A Lanting, James L Howard, Matthew G Teeter, Douglas Dr Naudie
BACKGROUND: There has been a trend in the evolution of total hip arthroplasty towards increased modularity; with this increase in modularity come some potentially harmful consequences. Modularity at the neck shaft junction has been linked to corrosion, adverse reaction to metal debris and pseudotumour formation. AIM: The aim of this retrieval study is to assess whether the surface integrity of the polyethylene (PE) liner is affected by metal wear debris in a single implant design series of THA revised for trunnionosis...
May 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29756501/unrecoverable-bi-products-of-drilling-titanium-alloy-and-tantalum-metal-implants-a-pilot-study
#20
Paweł Skowronek, Paweł Olszewski, Wojciech Święszkowski, Marek Synder, Marcin Sibiński, Jacek Mazek
BACKGROUND: Trabecular metal implants with a porous architecture that allows for the incorporation of bone into the implant during healing are gaining popularity in alloplastic revision procedures. The bi-products of drilling titanium alloy (Ti) and tantalum (Ta) implants have not been previously assessed. METHODS: Four holes were drilled in each of two spatially porous trabecular implants, one Ta and the other Ti alloy (Ti-6Al-7Nb), for this pilot in vitro study...
May 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
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