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https://www.readbyqxmd.com/read/28230707/low-cost-3d-printing-orbital-implant-templates-in-secondary-orbital-reconstructions
#1
Alison B Callahan, Ashley A Campbell, Carisa Petris, Michael Kazim
PURPOSE: Despite its increasing use in craniofacial reconstructions, three-dimensional (3D) printing of customized orbital implants has not been widely adopted. Limitations include the cost of 3D printers able to print in a biocompatible material suitable for implantation in the orbit and the breadth of available implant materials. The authors report the technique of low-cost 3D printing of orbital implant templates used in complex, often secondary, orbital reconstructions. METHODS: A retrospective case series of 5 orbital reconstructions utilizing a technique of 3D printed orbital implant templates is presented...
February 22, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28226495/a-pmma-microfluidic-dielectric-sensor-for-blood-coagulation-monitoring-at-the-point-of-care
#2
Debnath Maji, Michael A Suster, Erdem Kucukal, Umut A Gurkan, Evi X Stavrou, Pedram Mohseni, Debnath Maji, Michael A Suster, Erdem Kucukal, Umut A Gurkan, Evi X Stavrou, Pedram Mohseni, Umut A Gurkan, Pedram Mohseni, Debnath Maji, Erdem Kucukal, Evi X Stavrou, Michael A Suster
This paper describes the design and construct of a fully biocompatible, microfluidic, dielectric sensor targeted at monitoring human whole blood coagulation at the point-of-care (POC). The sensor assembly procedure involves using sputtered electrodes in a microfluidic channel with a physiologically relevant height of 50μm to create a three-dimensional (3D), parallel-plate, capacitive sensing area. The sensor is constructed with biocompatible materials of polymethyl methacrylate (PMMA) for the substrate and titanium nitride (TiN) for the sensing and floating electrodes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28220752/putting-3d-modelling-and-3d-printing-into-practice-virtual-surgery-and-preoperative-planning-to-reconstruct-complex-post-traumatic-skeletal-deformities-and-defects
#3
Kevin Tetsworth, Steve Block, Vaida Glatt
3D printing technology has revolutionized and gradually transformed manufacturing across a broad spectrum of industries, including healthcare. Nowhere is this more apparent than in orthopaedics with many surgeons already incorporating aspects of 3D modelling and virtual procedures into their routine clinical practice. As a more extreme application, patient-specific 3D printed titanium truss cages represent a novel approach for managing the challenge of segmental bone defects. This review illustrates the potential indications of this innovative technique using 3D printed titanium truss cages in conjunction with the Masquelet technique...
2017: SICOT-J
https://www.readbyqxmd.com/read/28202996/-surgical-reconstruction-of-maxillary-defects-using-a-computer-assisted-techniques
#4
W B Zhang, Y Yu, Y Wang, X J Liu, C Mao, C B Guo, G Y Yu, X Peng
The maxilla is the most important bony support of the mid-face skeleton and is critical for both esthetics and function. Maxillary defects, resulting from tumor resection, can cause severe functional and cosmetic deformities. Furthermore, maxillary reconstruction presents a great challenge for oral and maxillofacial surgeons. Nowadays, vascularized composite bone flap transfer has been widely used for functional maxillary reconstruction. In the last decade, we have performed a comprehensive research on functional maxillary reconstruction with free fibula flap and reported excellent functional and acceptable esthetic results...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28196619/development-and-verification-of-novel-porous-titanium-metaphyseal-cones-for-revision-total-knee-arthroplasty
#5
Ahmad Faizan, Manoshi Bhowmik-Stoker, Amanda E Kirk, Viktor E Krebs, Steven F Harwin, R Michael Meneghini
BACKGROUND: Porous metaphyseal cones are widely used in revision knee arthroplasty. A new system of porous titanium metaphyseal cones has been designed based on the femoral and tibial morphology derived from a computed tomography-based anatomical database. The purpose of this study is to evaluate the initial mechanical stability of the new porous titanium revision cone system by measuring the micromotion under physiologic loading compared with a widely-used existing porous tantalum metaphyseal cone system...
January 18, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28196474/biodegradable-magnesium-herbert-screw-image-quality-and-artifacts-with-radiography-ct-and-mri
#6
Lena Sonnow, Sören Könneker, Peter M Vogt, Frank Wacker, Christian von Falck
BACKGROUND: Magnesium alloys have recently been rediscovered as biodegradable implants in musculoskeletal surgery. This study is an ex-vivo trial to evaluate the imaging characteristics of magnesium implants in different imaging modalities as compared to conventional metallic implants. METHODS: A CE-approved magnesium Herbert screw (MAGNEZIX®) and a titanium screw of the same dimensions (3.2x20 mm) were imaged using different modalities: digital radiography (DX), multidetector computed tomography (MDCT), high resolution flat panel CT (FPCT) and magnetic resonance imaging (MRI)...
February 14, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28192239/super-silac-mix-coupled-with-sim-aims-assays-for-targeted-verification-of-phosphopeptides-discovered-in-a-large-scale-phosphoproteome-analysis-of-hepatocellular-carcinoma
#7
Yu-Tsun Lin, Kun-Yi Chien, Chia-Chun Wu, Wen-Yu Chang, Lichieh Julie Chu, Min-Chi Chen, Chau-Ting Yeh, Jau-Song Yu
: Plentiful studies have established a close association between aberrant phosphorylation and hepatocellular carcinoma (HCC). Here, we applied a quantitative phosphoproteomics platform combining dimethylation labeling and online 3D strong cation exchange chromatography (SCX)-titanium oxide (TiO2)/RP-LTQ-Orbitrap to compare phosphoproteomes between three pairs of HCC tissues and non-tumor counterparts. This analysis yielded 7868 quantifiable phosphopeptides and numerous up- or down-regulated candidates...
February 10, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28190843/application-of-internal-standard-method-for-several-3d-transition-metallic-elements-in-flame-atomic-absorption-spectrometry-using-a-multi-wavelength-high-resolution-spectrometer
#8
Yusuke Toya, Toshiko Itagaki, Kazuaki Wagatsuma
We investigated a simultaneous internal standard method in flame atomic absorption spectrometry (FAAS), in order to better the analytical precision of 3d-transition metals contained in steel materials. For this purpose, a new spectrometer system for FAAS, comprising a bright xenon lamp as the primary radiation source and a high-resolution Echelle monochromator, was employed to measure several absorption lines at a wavelength width of ca. 0.3 nm at the same time, which enables the absorbances of an analytical line and also an internal standard line to be estimated...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28183670/influence-of-different-grained-powders-and-pellets-made-of-niobium-and-ti-42nb-on-human-cell-viability
#9
Jana Markhoff, Markus Weinmann, Christian Schulze, Rainer Bader
Nowadays, biomaterials can be used to maintain or replace several functions of the human body if necessary. Titanium and its alloys, i.e. Ti6Al4V are the most common materials (70 to 80%) used for structural orthopedic implants due to their unique combination of good mechanical properties, corrosion resistance and biocompatibility. Addition of β-stabilizers, e.g. niobium, can improve the mechanical properties of such titanium alloys further, simultaneously offering excellent biocompatibility. In this in vitro study, human osteoblasts and fibroblasts were cultured on different niobium specimens (Nb Amperit, Nb Ampertec), Nb sheets and Ti-42Nb (sintered and 3D-printed by selective laser melting, SLM) and compared with forged Ti6Al4V specimens...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28167822/accelerating-corrosion-of-pure-magnesium-co-implanted-with-titanium-in-vivo
#10
Peng Hou, Pei Han, Changli Zhao, Hongliu Wu, Jiahua Ni, Shaoxiang Zhang, Jingyi Liu, Yuanzhuang Zhang, Haidong Xu, Pengfei Cheng, Shen Liu, Yufeng Zheng, Xiaonong Zhang, Yimin Chai
Magnesium is a type of reactive metal, and is susceptible to galvanic corrosion. In the present study, the impact of coexistence of Ti on the corrosion behavior of high purity Mg (HP Mg) was investigated both in vitro and in vivo. Increased corrosion rate of HP Mg was demonstrated when Mg and Ti discs were not in contact. The in vivo experiments further confirmed accelerating corrosion of HP Mg screws when they were co-implanted with Ti screws into Sprague-Dawley rats' femur, spacing 5 and 10 mm. Micro CT scan and 3D reconstruction revealed severe corrosion morphology of HP Mg screws...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28137635/in-silico-analysis-of-the-biomechanical-stability-of-commercially-pure-ti-and-ti-15mo-plates-for-the-treatment-of-mandibular-angle-fracture
#11
Satoshi Yamaguchi, Rodolfo B Anchieta, Fernando P S Guastaldi, Nick Tovar, Daisuke Tawara, Satoshi Imazato, Paulo G Coelho
PURPOSE: To investigate the influence of different materials and fixation methods on maximum principal stress (MPS) and displacement in reconstruction plates using in silico 3-dimensional finite element analysis (3D-FEA). MATERIALS AND METHODS: Computer-assisted designed (CAD) models of the mandible and teeth were constructed. Champy and AO/ASIF plates and fixation screws were designed with CAD software. 3D-FEA was performed by image-based CAE software. Maximum and minimum values of biomechanical stability, MPS, and displacement distribution were compared in Champy and AO/ASIF plates made from commercially pure titanium grade 2 (cp-Ti) and a titanium-and-molybdenum (14...
January 4, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28126354/strain-analysis-of-9-different-abutments-for-cement-retained-crowns-on-an-internal-hexagonal-implant
#12
Louai G Salaita, Burak Yilmaz, Jeremy D Seidt, Nancy L Clelland, Hua-Hong Chien, Edwin A McGlumphy
STATEMENT OF PROBLEM: Many aftermarket abutments for cement-retained crowns are available for the tapered screw-vent implant. Aftermarket abutments vary widely, from stock to custom abutments and in materials such as zirconia, titanium, or a combination of the two. How these aftermarket abutments perform under occlusal loads with regard to strain distribution is not clear. PURPOSE: The purpose of this in vitro study was to measure and compare the different strains placed upon the bone around implants by 9 different abutments for cement-retained crowns on an implant with an internal hexagonal platform...
January 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28120579/sacral-reconstruction-with-a-3d-printed-implant-after-hemisacrectomy-in-a-patient-with-sacral-osteosarcoma-1-year-follow-up-result
#13
Doyoung Kim, Jun Young Lim, Kyu Won Shim, Jung Woo Han, Seong Yi, Do Heum Yoon, Keung Nyun Kim, Yoon Ha, Gyu Yeul Ji, Dong Ah Shin
Pelvic reconstruction after sacral resection is challenging in terms of anatomical complexity, excessive loadbearing, and wide defects. Nevertheless, the technological development of 3D-printed implants enables us to overcome these difficulties. Here, we present a case of sacral osteosarcoma surgically treated with hemisacrectomy and sacral reconstruction using a 3D-printed implant. The implant was printed as a customized titanium prosthesis from a 3D real-sized reconstruction of a patient's CT images. It consisted mostly of a porous mesh and incorporated a dense strut...
March 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/28120065/skull-bone-defects-reconstruction-with-custom-made-titanium-graft-shaped-with-electron-beam-melting-technology-preliminary-experience-in-a-series-of-ten-patients
#14
Natale Francaviglia, Rosario Maugeri, Antonino Odierna Contino, Francesco Meli, Vito Fiorenza, Gabriele Costantino, Roberto Giuseppe Giammalva, Domenico Gerardo Iacopino
BACKGROUND: Cranioplasty represents a challenge in neurosurgery. Its goal is not only plastic reconstruction of the skull but also to restore and preserve cranial function, to improve cerebral hemodynamics, and to provide mechanical protection of the neural structures. The ideal material for the reconstructive procedures and the surgical timing are still controversial. Many alloplastic materials are available for performing cranioplasty and among these, titanium still represents a widely proven and accepted choice...
2017: Acta Neurochirurgica. Supplement
https://www.readbyqxmd.com/read/28106524/the-utility-of-3d-printing-for-surgical-planning-and-patient-specific-implant-design-for-complex-spinal-pathologies-case-report
#15
Ralph J Mobbs, Marc Coughlan, Robert Thompson, Chester E Sutterlin, Kevin Phan
OBJECTIVE There has been a recent renewed interest in the use and potential applications of 3D printing in the assistance of surgical planning and the development of personalized prostheses. There have been few reports on the use of 3D printing for implants designed to be used in complex spinal surgery. METHODS The authors report 2 cases in which 3D printing was used for surgical planning as a preoperative mold, and for a custom-designed titanium prosthesis: one patient with a C-1/C-2 chordoma who underwent tumor resection and vertebral reconstruction, and another patient with a custom-designed titanium anterior fusion cage for an unusual congenital spinal deformity...
January 20, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28090442/can-mri-accurately-detect-pilon-articular-malreduction-a-quantitative-comparison-between-ct-and-3t-mri-bone-models
#16
Shairah Radzi, Constantin Edmond Dlaska, Gary Cowin, Mark Robinson, Jit Pratap, Michael Andreas Schuetz, Sanjay Mishra, Beat Schmutz
BACKGROUND: Pilon fracture reduction is a challenging surgery. Radiographs are commonly used to assess the quality of reduction, but are limited in revealing the remaining bone incongruities. The study aimed to develop a method in quantifying articular malreductions using 3D computed tomography (CT) and magnetic resonance imaging (MRI) models. METHODS: CT and MRI data were acquired using three pairs of human cadaveric ankle specimens. Common tibial pilon fractures were simulated by performing osteotomies to the ankle specimens...
December 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28071596/3d-bioprinting-of-gelma-scaffolds-triggers-mineral-deposition-by-primary-human-osteoblasts
#17
Christine McBeth, Jasmin Lauer, Michael Ottersbach, Jennifer Campbell, Andre Sharon, Alexis F Sauer-Budge
Due to its relatively low level of antigenicity and high durability, titanium has successfully been used as the major material for biological implants. However, because the typical interface between titanium and tissue precludes adequate transmission of load into the surrounding bone, over time, load-bearing implants tend to loosen and revision surgeries are required. Osseointegration of titanium implants requires presentation of both biological and mechanical cues that promote attachment of and trigger mineral deposition by osteoblasts...
January 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28068971/a-comparison-of-the-shaping-ability-of-three-nickel-titanium-rotary-instruments-a-micro-computed-tomography-study-via-a-contrast-radiopaque-technique-in-vitro
#18
Zhao Wei, Zhi Cui, Ping Yan, Han Jiang
BACKGROUND: Micro-CT (μCT) studies that combine simulated canals with meglucamine diatrizoate to evaluate the shaping ability of nickel-titanium (NiTi) rotary instruments are lacking in the literature. The purpose of this study was to evaluate the shaping ability of three new different nickel-titanium rotary instruments in simulated root canals using μCT. METHODS: Thirty simulated root canals with a curvature of 60° were randomly allocated into the following 3 groups (n = 10): Group 1, ProTaper Universal (PTU) rotary system; Group 2, Reciproc single-file system; and Group 3, K3XF rotary system...
January 9, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28046340/su-g-tep2-10-feasibility-of-newly-designed-applicator-for-high-dose-rate-brachytherapy-treatment-of-patients-with-vaginal-vault-recurrence
#19
V Lee, X Huang, M Wong, M Chan, E Chui, S Cheung, R Leung, K Lee, G Law, K Leung, S Tung, D Kwong
PURPOSE: To compare the dose of an in-house 3D-printed gynecology applicator (TMHGA) for vaginal vault recurrence of corpus cancer patients after operation for high dose rate brachytherapy treatment with commercially available applicators. METHODS: A newly designed applicator is made from 3D-printing methods using ABSM30i. The isodose of the applicator is compared with Elekta multi-channel (MC) applicator and titanium Rotterdam applicator with coupling central tube and vaginal cylinder (RC)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28018068/customized-iliac-prosthesis-for-reconstruction-in-giant-cell-tumour-a-unique-treatment-approach
#20
Tarun Verma, Ankur Sharma, Amit Sharma, Lalit Maini
Giant cell tumour (GCT) of flat bones of pelvis is extremely rare. GCT of the ilium and ischium represent less than 0.05% of all GCT. Iliac bone GCT has been treated traditionally by intra-lesion curettage with bone grafting, wide resection with or without reconstruction and hemi-pelvectomy in very aggressive tumours. None of the above treatments were without morbidities. Reconstruction using bone grafts and bone cement has also been inadequate. In GCT, where life expectancy is not decreased significantly, surgical treatment should be aimed at giving optimum functional outcome...
October 2016: Journal of Clinical Orthopaedics and Trauma
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