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https://www.readbyqxmd.com/read/27925774/influence-of-backscatter-radiation-on-cranial-reconstruction-implants
#1
Yoshiaki Sakamoto, Naoyoshi Koike, Hideyuki Takei, Mari Ohno, Tomoru Miwa, Kazunari Yoshida, Naoyuki Shigematsu, Kazuo Kishi
OBJECTIVES: We aimed to evaluate backscatter dose variations in different cranial bone implant materials in an experimental model designed to simulate postoperative radiotherapy. METHODS: We assessed the radiation backscatter doses associated with sheet and mesh type titanium plates and hydroxyapatite (HAP) samples (porosity, 35%, 50%, and 85%). The samples were irradiated with 6 MV and 10 MV photon beams from a linear accelerator. Measurements were obtained using an ionization chamber and radiochromic films cut from the same batch...
December 7, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27925441/anodized-3d-printed-titanium-implants-with-dual-micro-and-nano-scale-topography-promote-interaction-with-human-osteoblasts-and-osteocyte-like-cells
#2
Karan Gulati, Matthew Prideaux, Masakazu Kogawa, Luis Lima-Marques, Gerald J Atkins, David M Findlay, Dusan Losic
The success of implantation of materials into bone is governed by effective osseointegration, requiring biocompatibility of the material and the attachment and differentiation of osteoblastic cells. To enhance cellular function in response to the implant surface, micro- and nano-scale topography have been suggested as essential. In this study, we present bone implants based on 3D-printed titanium alloy (Ti6Al4V), with a unique dual topography composed of micron-sized spherical particles and vertically aligned titania nanotubes...
December 7, 2016: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/27925308/impact-of-calcified-target-lesions-on-the-outcome-of-percutaneous-coronary-intervention-for-acute-coronary-syndrome-insights-from-the-base-acs-trial
#3
Pasi P Karjalainen, Wail Nammas, Kari Kervinen, Adam de Belder, Fernando Rivero-Crespo, Antti Ylitalo, Juhani K E Airaksinen
OBJECTIVES: We performed a post hoc analysis of outcome in patients with, versus those without, calcified target lesions from the BASE ACS trial. BACKGROUND: The outcome of contemporary stent implantation in patients with calcified lesions presenting with acute coronary syndrome is unknown. METHODS: The BASE ACS trial randomized 827 patients (1:1) presenting with acute coronary syndrome to receive either titanium-nitride-oxide-coated stents or everolimus-eluting stents...
December 7, 2016: Journal of Interventional Cardiology
https://www.readbyqxmd.com/read/27918899/the-effects-of-sost-on-implant-osseointegration-in-ovariectomy-osteoporotic-mice
#4
Rui Shu, Dongqing Ai, Ding Bai, Jinlin Song, Mengyuan Zhao, Xianglong Han
OBJECTIVE: Osteoporosis is a risk factor for implant fixation failure. The inhibition of sclerostin effectively improves bone formation and bone remodeling. Therefore, this study investigated whether SOST deficiency enhances the osseointegration of implants in a mouse model of osteoporosis induced by ovariectomy (OVX). DESIGN: Osteoporosis was induced in female C57BL/6 and SOST deficient mice by OVX. Titanium implants were placed in the bilateral distal aspects of the femurs...
November 21, 2016: Archives of Oral Biology
https://www.readbyqxmd.com/read/27918885/mutant-ccl2-protein-coating-mitigates-wear-particle-induced-bone-loss-in-a-murine-continuous-polyethylene-infusion-model
#5
Akira Nabeshima, Jukka Pajarinen, Tzu-Hua Lin, Xinyi Jiang, Emmanuel Gibon, Luis A Córdova, Florence Loi, Laura Lu, Eemeli Jämsen, Kensuke Egashira, Fan Yang, Zhenyu Yao, Stuart B Goodman
Wear particle-induced osteolysis limits the long-term survivorship of total joint replacement (TJR). Monocyte/macrophages are the key cells of this adverse reaction. Monocyte Chemoattractant Protein-1 (MCP-1/CCL2) is the most important chemokine regulating trafficking of monocyte/macrophages in particle-induced inflammation. 7ND recombinant protein is a mutant of CCL2 that inhibits CCL2 signaling. We have recently developed a layer-by-layer (LBL) coating platform on implant surfaces that can release biologically active 7ND...
November 24, 2016: Biomaterials
https://www.readbyqxmd.com/read/27916400/the-therapeutic-effect-of-patient-specific-implants-in-cranioplasty
#6
Thomas Zegers, Mariel Ter Laak-Poort, David Koper, Bernd Lethaus, Peter Kessler
OBJECTIVE: Patient specific implants have been used for the reconstruction of large skull bone defects. Several therapeutic effects have been suggested in current literature but were never objectified. The aim of the current study was to evaluate the change in quality of life, pain, aesthetics, and the surgical and medical outcomes after reconstruction of large skull bone defects with titanium or polyetheretherketone (PEEK) implants. METHODS: We retrospectively evaluated 29 consecutive patients receiving a patient specific skull implant between November 2004 and December 2015...
November 2, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/27915444/outcomes-of-proximal-humeral-fracture-fixation-with-locked-cfr-peek-plating
#7
Jan Christoph Katthagen, Alexander Ellwein, Olga Lutz, Christine Voigt, Helmut Lill
PURPOSE: To investigate the outcomes of proximal humeral fracture (PHF) fixation with a novel carbon-fiber-reinforced (CFR)-PEEK plate and to compare results with outcomes after conventional locked titanium plating. METHODS: Twenty-one patients (7 male, 14 female) with operative treatment of unilateral displaced PHFs (mean age, 66.8 ± 9.9 years) with a novel CRF-PEEK plate were prospectively enrolled. Patients were followed up clinically (Constant Score, Simple Shoulder Test and Simple Shoulder Value) and radiologically 3 months postoperative and again clinically 12 months postoperative...
December 3, 2016: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/27915417/retrospective-analysis-of-10-000-implants-from-insertion-up-to-20%C3%A2-years-analysis-of-implantations-using-augmentative-procedures
#8
Wolfram Knöfler, Thomas Barth, Reinhard Graul, Dietmar Krampe
BACKGROUND: A sufficient amount of bone is essential to ensure long-term stability of dental implants. To support the bone regeneration process, different techniques and materials are available. It has been questioned whether these techniques and materials may compromise implant survival compared to pristine bone. To properly answer this question, long-term stability up to 20.2 years after insertion of implants placed in augmented or non-augmented sites was retrospectively analysed. METHODS: Retrospective analysis included 10,158 implants from 3095 patients in three private practices who underwent implant therapy with or without bone augmentation procedures...
December 2016: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/27915156/fracture-resistance-of-zirconia-based-implant-abutments-after-artificial-long-term-aging
#9
Abdulaziz Alsahhaf, Benedikt Christopher Spies, Kirstin Vach, Ralf-Joachim Kohal
OBJECTIVE: To investigate the survival rate, fracture strength, bending moments, loading to fracture and fracture modes of different designs of zirconia abutments after dynamic loading with thermocycling, and compare these values to titanium abutments. METHODS: A total of 80 abutment samples were divided into 5 test groups of 16 samples in each group. The study included the following groups, "Group 1" CAD/CAM produced all-zirconia abutments, "Group 2" titanium abutments, "Group 3" zirconia-abutments adhesively luted to a titanium base, "Group 4" prefabricated all-zirconia abutments and "Group 5" zirconia-abutments glass soldered to a titanium base...
November 21, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27915020/multifunctions-of-dual-zn-mg-ion-co-implanted-titanium-on-osteogenesis-angiogenesis-and-bacteria-inhibition-for-dental-implants
#10
Yiqiang Yu, Guodong Jin, Yang Xue, Donghui Wang, Xuanyong Liu, Jiao Sun
In order to improve the osseointegration and long-term survival of dental implants, it is urgent to develop a multifunctional titanium surface which would simultaneously have osteogeneic, angiogeneic and antibacterial properties. In this study, a potential dental implant material-dual Zn/Mg ion co-implanted titanium (Zn/Mg-PIII) was developed via plasma immersion ion implantation (PIII). The Zn/Mg-PIII surfaces were found to promote initial adhesion and spreading of rat bone marrow mesenchymal stem cells (rBMSCs) via the upregulation of the gene expression of integrin α1 and integrin β1...
November 30, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27914255/immobilizing-bacitracin-on-titanium-for-prophylaxis-of-infections-and-for-improving-osteoinductivity-an-in-vivo-study
#11
Bin'en Nie, Haiyong Ao, Teng Long, Jianliang Zhou, Tingting Tang, Bing Yue
Bacitracin immobilized on the titanium (Ti) surface significantly improves anti-bacterial activity and biocompatibility in vitro. In the current study, we investigated the biologic performance (bactericidal effect and bone-implant integration) of bacitracin-modified Ti in vivo. A rat osteomyelitis model with femoral medullary cavity placement of Ti rods was employed to analyze the prophylactic effect of bacitracin-modified Ti (Ti-BC). Thirty-six female Sprague Dawley (SD) rats were used to establish the Ti implant-associated infection...
November 27, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27914012/biomechanical-investigation-of-titanium-elastic-nail-prebending-for-treating-diaphyseal-long-bone-fractures
#12
Yen-Nien Chen, Pei-Yuan Lee, Chih-Wei Chang, Yi-Hung Ho, Yao-Te Peng, Chih-Han Chang, Chun-Ting Li
This study numerically investigated the deformation of titanium elastic nails prebent at various degrees during implantation into the intramedullary canal of fractured bones and the mechanism by which this prebending influenced the stability of the fractured bone. Three degrees of prebending the implanted portions of the nails were used: equal to, two times, and three times the diameter of the intramedullary canal. Furthermore, a simulated diaphyseal fracture with a 5-mm gap was created in the middle shaft portion of the bone fixed with two elastic nails in a double C-type configuration...
December 2, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27913177/effect-of-trunnion-roughness-and-length-on-the-modular-taper-junction-strength-under-typical-intraoperative-assembly-forces
#13
S Y Jauch-Matt, A W Miles, H S Gill
Modular hip implants are at risk of fretting-induced postoperative complications most likely initiated by micromotion between adjacent implant components. A stable fixation between ball head and stem-neck taper is critical to avoid excessive interface motions. Therefore, the aim of this study was to identify the effect of trunnion roughness and length on the modular taper strength under typical intraoperative assembly forces. Custom-made Titanium trunnions (standard/mini taper, smooth/grooved surface finish) were assembled with modular Cobalt-chromium heads by impaction with peak forces ranging from 2kN to 6kN...
November 29, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27910719/artifacts-in-multimodal-imaging-of-titanium-zirconium-and-binary-titanium-zirconium-alloy-dental-implants-an-in-vitro-study
#14
Ralf Smeets, Maximilian Schöllchen, Tobias Gauer, Gahzal Aarabi, Alexandre T Assaf, Carsten Rendenbach, Benedicta Beck-Broichsitter, Jan Semmusch, Jan Sedlacik, Max Heiland, Jens Fiehler, Susanne Siemonsen
OBJECTIVES: To analyze and evaluate imaging artifacts induced by zirconium, titanium and titanium-zirconium alloy dental implants. METHODS: Zirconium, titanium and titanium-zirconium alloy implants were embedded in gelatin and MRI, CT and CBCT were performed. Standard-protocols were used for each modality. For MRI, line-distance-profiles were plotted to quantify the accuracy of size-determination. For CT and CBCT, six shells surrounding the implant were defined every 0...
December 2, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27909129/metallosis-following-implantation-of-magnetically-controlled-growing-rods-in-the-treatment-of-scoliosis-a-case-series
#15
K H Teoh, C von Ruhland, S L Evans, S H James, A Jones, J Howes, P R Davies, S Ahuja
AIMS: We present a case series of five patients who had revision surgery following magnetic controlled growing rods (MGCR) for early onset scoliosis. Metallosis was found during revision in four out of five patients and we postulated a mechanism for rod failure based on retrieval analysis. PATIENTS AND METHODS: Retrieval analysis was performed on the seven explanted rods. The mean duration of MCGR from implantation to revision was 35 months (17 to 46). The mean age at revision was 12 years (7 to 15; four boys, one girl)...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27904753/skin-flap-complications-after-decompressive-craniectomy-and-cranioplasty-proposal-of-classification-and-treatment-options
#16
Alessandro Di Rienzo, Pier Paol Pangrazi, Michele Riccio, Roberto Colasanti, Ilaria Ghetti, Maurizio Iacoangeli
BACKGROUND: The list of complications reported after decompressive craniectomy (DC) and cranioplasty is progressively increasing. Nonetheless, the exact incidence of these events is still ill-defined. Problems affecting skin flaps after DC and cranioplasty have never been accurately analyzed in papers and their impact on patients' prognosis is largely underestimated. METHODS: In a 10-year time, we treated by DC 450 patients, 344 of whom underwent cranioplasty, either with autologous bone or artificial implants (hydroxyapatite, polyetheretherketone, titanium, polymethylmethacrylate)...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/27902850/biomechanical-comparison-of-2-veterinary-locking-plates-to-monocortical-screw-polymethylmethacrylate-fixation-in-canine-cadaveric-cervical-vertebral-column
#17
Bianca F Hettlich, Geoffrey T Fosgate, Alan S Litsky
OBJECTIVE: To compare the biomechanical properties of 2 veterinary locking plates and monocortical screws/polymethylmethacrylate (PMMA) fixation in canine cadaveric cervical vertebral columns. STUDY DESIGN: Biomechanical cadaveric study. MATERIALS: Nineteen cervical vertebral columns (C2-C7) from large breed, skeletally mature, canine cadavers were used. A cortical ring was placed as a disk spacer at C4-C5 in all specimens. Seven vertebral columns were plated at C4-C5 with two 4-hole, 3...
November 30, 2016: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/27899950/bone-anchored-titanium-implants-in-patients-with-auricular-defects-three-years-and-27-patients-experience
#18
Emilio Mevio, Luca Facca, Stefano Schettini, Mauro Mullace
Different surgical solutions have been proposed for reconstruction of the auricle following loss of the pinna through traumatic injury or neoplastic disease or in patients with congenital defects. Surgical treatment may involve the insertion of an autogenous rib cartilage framework or the use of a porous polymer material inserted into an expanded postauricular flap. Reconstruction with rib cartilage has yielded good results but requires more than one surgical step, and adverse events can occur both at the donor and at the acceptor site; cases of prosthesis rejection have also been described following application of the polymeric prosthesis...
2016: International Journal of Otolaryngology
https://www.readbyqxmd.com/read/27896599/inflammatory-cell-response-to-ultra-thin-amorphous-and-crystalline-hydroxyapatite-surfaces
#19
Louise Rydén, Omar Omar, Anna Johansson, Ryo Jimbo, Anders Palmquist, Peter Thomsen
It has been suggested that surface modification with a thin hydroxyapatite (HA) coating enhances the osseointegration of titanium implants. However, there is insufficient information about the biological processes involved in the HA-induced response. This study aimed to investigate the inflammatory cell response to titanium implants with either amorphous or crystalline thin HA. Human mononuclear cells were cultured on titanium discs with a machined surface or with a thin, 0.1 μm, amorphous or crystalline HA coating...
January 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/27894544/effect-of-longitudinal-flutes-on-miniscrew-implant-stability-and-3-dimensional-bone-formation
#20
Peter An V Truong, Phillip M Campbell, Elias D Kontogiorgos, Reginald W Taylor, Hee-Moon Kyung, Peter H Buschang
INTRODUCTION: The purpose of this study was to evaluate the effects of longitudinal flutes on miniscrew implant (MSI) stability and bone healing. METHODS: Using 11 skeletally mature New Zealand white rabbits, we placed 31 longitudinally fluted and 31 nonfluted, 3-mm-long MSIs in standardized positions in their calvaria and immediately loaded them with 100 g using nickel-titanium coil springs. Insertion torque values were obtained for each MSI placed; removal torque values were obtained for 28 MSIs that had been in place for 6 weeks and 20 MSIs that had been in place for 2 weeks...
December 2016: American Journal of Orthodontics and Dentofacial Orthopedics
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