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3D titanium implants

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https://www.readbyqxmd.com/read/29761982/-study-on-the-geometric-characteristics-and-distribution-of-porosities-in-three-dimensional-printed-ti-6al-4v-titanium-alloy
#1
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/29705965/evaluation-of-implant-screw-loosening-by-resonance-frequency-analysis-with-triaxial-piezoelectric-pick-up-in-vitro-model-and-in-vivo-animal-study
#2
Makiko Miyashita, Toru Ogawa, Hideki Naito, Aya Shibamoto, Angelina Shuhua Wang, Kenta Shobara, Keiichi Sasaki
OBJECTIVE: The aim of this study was to evaluate implant screw loosening using resonance frequency (RF) analysis with triaxial piezoelectric pick-up in vitro and in vivo. METHODS: For the in vitro experiment, a titanium implant was inserted into a mandibular model. The abutment screws were tightened to 10 N torque and loosened from 0 to 90° for RF measurement using 13 different screw conditions. In the in vivo experiment, three titanium implants were installed in each tibia of a New Zealand white rabbit, and the RF values were recorded after 8 weeks...
April 28, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29697648/-the-interdisciplinary-approach-to-the-rehabilitation-of-the-patients-presenting-with-congenital-atresia-of-the-external-auditory-canal-and-the-concomitant-microtia
#3
Kh M Diab, D N Nazaryan, N A Daikhes, A E Kharazyan, D S Kondratchikov, S V Yarantsev, O A Pashchinina, M M Cherninkiy
The objective of the present study was to develop and introduce into the clinical practice the method for the combined aesthetic and functional rehabilitation of the patients presenting with congenital atresia of the external auditory canal (CAEAC) and the concomitant microtia. A total of 8 patients at the age from 6 to 21 years with unilateral CAEAC and microtia were given the surgical treatment. During the intervention, atresia was resolved using the trans-mastoid approach, tympanoplasty of autofasciae and ossiculoplasty making use of the partial titanium prosthesis and the placement of cranial osteointegratable titanium implants...
2018: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/29697440/three-dimensionally-printed-personalized-implant-design-and-reconstructive-surgery-for-a-bone-tumor-of-the-calcaneus-a-case-report
#4
Jong Woong Park, Hyun Guy Kang, Kwun Mook Lim, June Hyuk Kim, Han Soo Kim
CASE: A 23-year-old soldier was diagnosed with a calcaneal desmoplastic fibroma. Limb-salvage surgery using a 3-dimensionally (3D) printed personalized implant made from a titanium alloy was planned. The implant had a mesh-style surface for free tendon suture, and the joint surface was smooth to preserve the subtalar joint. The implant had 3 hollow posts in case of future transarticular immobilization. At the last follow-up, the implant was painless and stable, and the patient could walk normally without support...
April 25, 2018: JBJS Case Connector
https://www.readbyqxmd.com/read/29682523/biocompatibility-of-bespoke-3d-printed-titanium-alloy-plates-for-treating-acetabular-fractures
#5
Xuezhi Lin, Xingling Xiao, Yimeng Wang, Cheng Gu, Canbin Wang, Jiahui Chen, Han Liu, Juan Luo, Tao Li, Di Wang, Shicai Fan
Treatment of acetabular fractures is challenging, not only because of its complicated anatomy but also because of the lack of fitting plates. Personalized titanium alloy plates can be fabricated by selective laser melting (SLM) but the biocompatibility of these three-dimensional printing (3D-printed) plates remains unknown. Plates were manufactured by SLM and their cytocompatibility was assessed by observing the metabolism of L929 fibroblasts incubated with culture medium extracts using a CCK-8 assay and their morphology by light microscopy...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29668300/magnitude-of-cone-beam-computed-tomography-image-artifacts-related-to-zirconium-and-titanium-implants-impact-on-image-quality
#6
Rocharles C Fontenele, Eduarda Hl Nascimento, Taruska V Vasconcelos, Marcel Noujeim, Deborah Q Freitas
OBJECTIVES: To evaluate the magnitude of artifacts related to titanium and zirconium implants at different distances and angulations and their impact on cone beam computed tomography (CBCT) image quality. METHODS: CBCT images were obtained before and after the insertion of titanium and zirconium implants in a mandible on different CBCT units: Picasso Trio, ProMax 3D and 3D Accuitomo 80. Artefact was assessed by measuring the standard deviation of gray values (SD) and contrast-to-noise ratio (CNR) of 11 regions of interest (ROI) at different distances (1...
April 18, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29648876/use-of-patient-specific-3d-printed-titanium-implants-for-complex-foot-and-ankle-limb-salvage-deformity-correction-and-arthrodesis-procedures
#7
Travis J Dekker, John R Steele, Andrew E Federer, Kamran S Hamid, Samuel B Adams
BACKGROUND: The advancement of 3D printing technology has allowed for the use of custom-designed implants for difficult-to-treat foot and ankle pathologies. This study reports on the radiographic and functional outcomes of a case series of patients treated with patient-specific 3D-printed titanium implants. METHODS: Fifteen consecutive patients treated with custom-designed 3D-printed implant cages for severe bone loss, deformity correction, and/or arthrodesis procedures were included in this study...
April 1, 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29548880/the-advantages-of-advanced-computer-assisted-diagnostics-and-three-dimensional-preoperative-planning-on-implant-position-in-orbital-reconstruction
#8
Jesper Jansen, Ruud Schreurs, Leander Dubois, Thomas J J Maal, Peter J J Gooris, Alfred G Becking
OBJECTIVE: Advanced three-dimensional (3D) diagnostics and preoperative planning are the first steps in computer-assisted surgery (CAS). They are an integral part of the workflow, and allow the surgeon to adequately assess the fracture and to perform virtual surgery to find the optimal implant position. The goal of this study was to evaluate the accuracy and predictability of 3D diagnostics and preoperative virtual planning without intraoperative navigation in orbital reconstruction. METHODS: In 10 cadaveric heads, 19 complex orbital fractures were created...
February 26, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29526301/digital-design-of-patient-specific-abutments-for-the-retention-of-implant-retained-facial-prostheses
#9
Carolyn Kincade, Lindsay McHutchion, Johan Wolfaardt
The present report describes the digital design of patient-specific milled abutments for the retention of osseointegrated facial prostheses by using digital technology. Patient imaging including surface scans of the patient's head, scans of the patient's definitive cast, and digitally designed prosthesis prototypes were combined to create a digital simulation of the patient. Using this simulation, patient-specific abutments were digitally designed, printed in 3-dimensions (3D), and finally copy-milled in titanium...
March 8, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29496624/bony-ingrowth-potential-of-3d-printed-porous-titanium-alloy-a-direct-comparison-of-interbody-cage-materials-in-an-in-vivo-ovine-lumbar-fusion-model
#10
Kirk McGilvray, Jeremiah Easley, Howard B Seim, Daniel Regan, Sigurd H Berven, Wellington K Hsu, Thomas E Mroz, Christian M Puttlitz
BACKGROUND CONTEXT: There is significant variability in the materials commonly used for interbody cages in spine surgery. It is theorized that 3-D printed interbody cages utilizing porous titanium material can provide more consistent bone ingrowth and biological fixation. PURPOSE: The purpose of this study was to provide an evidence-based approach to decision making regarding interbody materials for spinal fusion. STUDY DESIGN: Comparative animal study...
February 26, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29486449/in-vitro-characterization-of-3d-printed-scaffolds-aimed-at-bone-tissue-regeneration
#11
João C Boga, Sónia P Miguel, Duarte de Melo-Diogo, António G Mendonça, Ricardo O Louro, Ilídio J Correia
The incidence of fractures and bone-related diseases like osteoporosis has been increasing due to aging of the world's population. Up to now, grafts and titanium implants have been the principal therapeutic approaches used for bone repair/regeneration. However, these types of treatment have several shortcomings, like limited availability, risk of donor-to-recipient infection and tissue morbidity. To overcome these handicaps, new 3D templates, capable of replicating the features of the native tissue, are currently being developed by researchers from the area of tissue engineering...
May 1, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29481493/contour-restoration-of-over-resected-mandibular-angle-and-lower-border-by-reduction-mandibuloplasty-using-three-dimensional-planning-and-computer-aided-design-and-manufacturing-custom-made-titanium-implants
#12
Jae Man Woo, Seung-Hak Baek, Jong-Cheol Kim, Jin-Young Choi
OBJECTIVE: The purpose of this clinical report was to introduce a new methodology for contour restoration of the over-resected mandible by reduction mandibuloplasty using 3-dimensional (3D) planning and computer-assisted design and manufacturing (CAD-CAM) custom-made titanium implants. PATIENT AND METHOD: A 20-year-old male patient had undergone reduction of the zygoma and mandibular angle and lower border for esthetic reason 1 year ago at a private clinic. However, he was not satisfied with surgical outcome and wanted to restore his original facial volume and contour...
February 23, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29475755/marginal-discrepancy-of-cad-cam-complete-arch-fixed-implant-supported-frameworks
#13
Burak Yilmaz, Ediz Kale, William M Johnston
STATEMENT OF PROBLEM: Computer-aided design and computer-aided manufacturing (CAD-CAM) high-density polymers (HDPs) have recently been marketed for the fabrication of long-term interim implant-supported fixed prostheses. However, information regarding the precision of fit of CAD-CAM HDP implant-supported complete-arch screw-retained prostheses is scarce. PURPOSE: The purpose of this in vitro study was to evaluate the marginal discrepancy of CAD-CAM HDP complete-arch implant-supported screw-retained fixed prosthesis frameworks and compare them with conventional titanium (Ti) and zirconia (Zir) frameworks...
February 21, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29464784/total-nasal-reconstruction-with-3d-custom-made-porous-titanium-prosthesis-and-free-thoracodorsal-artery-perforator-flap-a-case-report
#14
Quentin Qassemyar, Nathaniel Assouly, Yoni Madar, Stéphane Temam, Frédéric Kolb
Total nasal reconstruction is a challenging surgical procedure which usually involves a free flap, forehead flap, and cartilage grafts. In certain failure situations where patients do not accept the idea of anaplastology, possibilities become very limited. We report the case of a patient who underwent several reconstruction steps with multiple failures including free and local flaps and cartilage harvests which showed recurrent episodes of necrosis and infection leading to melting and collapse of reconstructed structures...
February 21, 2018: Microsurgery
https://www.readbyqxmd.com/read/29457442/-development-and-application-of-artificial-vertebral-body
#15
REVIEW
Jian-Tao Liu, Feng Zhang, Zheng-Chao Gao, Bin-Bin Niu, Yu-Huan Li, Xi-Jing He
Artificial vertebral body has achieved good results in treating spinal tumors, tuberculosis, fracture and other diseases. Currently, artificial vertebral body with variety of kinds and pros and cons, is generally divided into two types: fusion type and movable type. The former according to whether the height could be adjusted and strength of self-stability is divided into three types: support-fixed type, adjust-fixed type and self-fixed type. Whether the height of self-fixed type could be adjusted is dependent on structure of collar thread rotation...
December 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29426786/effect-of-feldspathic-porcelain-layering-on-the-marginal-fit-of-zirconia-and-titanium-complete-arch-fixed-implant-supported-frameworks
#16
Burak Yilmaz, Faris A Alshahrani, Ediz Kale, William M Johnston
STATEMENT OF PROBLEM: Veneering with porcelain may adversely affect the marginal fit of long-span computer-aided design and computer-aided manufacturing (CAD-CAM) implant-supported fixed prostheses. Moreover, data regarding the precision of fit of CAD-CAM-fabricated implant-supported complete zirconia fixed dental prostheses (FDPs) before and after porcelain layering are limited. PURPOSE: The purpose of this in vitro study was to evaluate the effect of porcelain layering on the marginal fit of CAD-CAM-fabricated complete-arch implant-supported, screw-retained FDPs with presintered zirconia frameworks compared with titanium...
February 6, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29414477/effect-of-porous-orthopaedic-implant-material-and-structure-on-load-sharing-with-simulated-bone-ingrowth-a-finite-element-analysis-comparing-titanium-and-peek
#17
R Dana Carpenter, Brett S Klosterhoff, F Brennan Torstrick, Kevin T Foley, J Kenneth Burkus, Christopher S D Lee, Ken Gall, Robert E Guldberg, David L Safranski
Osseointegration of load-bearing orthopaedic implants, including interbody fusion devices, is critical to long-term biomechanical functionality. Mechanical loads are a key regulator of bone tissue remodeling and maintenance, and stress-shielding due to metal orthopaedic implants being much stiffer than bone has been implicated in clinical observations of long-term bone loss in tissue adjacent to implants. Porous features that accommodate bone ingrowth have improved implant fixation in the short term, but long-term retrieval studies have sometimes demonstrated limited, superficial ingrowth into the pore layer of metal implants and aseptic loosening remains a problem for a subset of patients...
April 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29398110/surface-characteristics-and-biocompatibility-of-cranioplasty-titanium-implants-following-different-surface-treatments
#18
Muhanad M Hatamleh, Xiaohong Wu, Ahmad Alnazzawi, Jason Watson, David Watts
OBJECTIVE: Surface and mechanical properties of titanium alloys are integral for their use in restoring bone defects of skull and face regions. These properties are affected by the method of constructing and surface treatment of the titanium implant. This study aimed to investigate the effects of titanium finishing protocols on the surface morphology, hardness and biocompatibility of TiAl6V4. METHODS: Square shaped TiAl6V4 specimens (ASTM F68) (10×10×0.5mm) were divided into seven groups of different surface treatments (n=10)...
April 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29353526/using-3-dimensional-modeling-to-customize-titanium-plates-for-repair-of-chest-wall-trauma
#19
Justin A Smith, Vanessa P Ho, Christopher W Towe
BACKGROUND: Open reduction and internal fixation of rib fractures is recommended to decrease mortality, shorten the duration of mechanical ventilation, and lower hospital length of stay. Prosthetic titanium plates are frequently used to repair chest wall trauma, and are typically contoured to the patient's anatomy at the time of implant in the operating room. We describe the use of 3-dimensional (3D) digitally corrected rapid prototyping to generate a model of a patient's skeletal anatomy for the purposes of preoperative customization of standard titanium plates for fixation of rib fractures...
January 1, 2018: Surgical Innovation
https://www.readbyqxmd.com/read/29342864/mechanical-properties-of-a-newly-additive-manufactured-implant-material-based-on-ti-42nb
#20
Christian Schulze, Markus Weinmann, Christoph Schweigel, Olaf Keßler, Rainer Bader
The application of Ti-6Al-4V alloy or commercially pure titanium for additive manufacturing enables the fabrication of complex structural implants and patient-specific implant geometries. However, the difference in Young's modulus of α + β-phase Ti alloys compared to the human bone promotes stress-shielding effects in the implant-bone interphase. The aim of the present study is the mechanical characterization of a new pre-alloyed β-phase Ti-42Nb alloy for application in additive manufacturing. The present investigation focuses on the mechanical properties of SLM-printed Ti-42Nb alloy in tensile and compression tests...
January 13, 2018: Materials
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