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https://www.readbyqxmd.com/read/29342864/mechanical-properties-of-a-newly-additive-manufactured-implant-material-based-on-ti-42nb
#1
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
https://www.readbyqxmd.com/read/29340352/bone-healing-at-functionally-loaded-and-unloaded-screw-shaped-implants-supporting-single-crowns-a-histomorphometric-study-in-humans
#2
Daichi Yonezawa, Adriano Piattelli, Riccardo Favero, Mauro Ferri, Giovanna Iezzi, Daniele Botticelli
PURPOSE: To evaluate histologically and histomorphometrically the effect of a delayed load on healing at implants with a moderately rough surface. MATERIALS AND METHODS: Two solid titanium screw-shaped devices, 5 mm long and 3.5 mm in diameter, were inserted in the distal segments of the alveolar ridge of 16 volunteer patients in a nonsubmerged fashion. After 2 months, one implant was loaded, while the other was left unloaded. After 2 months, the two implants were collected from 10 patients using a sonic instrument, and ground sections were prepared from the biopsy specimens...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29340342/precision-of-the-connection-between-implant-and-standard-or-computer-aided-design-computer-aided-manufacturing-abutments-a-novel-evaluation-method
#3
Diego Lops, Roberto Meneghello, Luca Sbricoli, Gianpaolo Savio, Eriberto Bressan, Edoardo Stellini
PURPOSE: The aim of this in vitro study was to verify whether or not stock and computer-aided design/computer-aided manufacturing (CAD/CAM) abutments show similar precision in the connection with the respective implants. MATERIALS AND METHODS: Ten CAD/CAM titanium abutments were compared with 10 stock titanium abutments. Each abutment fit a regular-platform implant (Institute Straumann). Implants and abutments were measured independently and then connected. During the connection procedure, the torque was measured using a six-axes load cell...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29338177/a-novel-alkali-activation-of-titanium-substrates-to-grow-thick-and-covalently-bound-pmma-layers
#4
Melania Reggente, Patrick Masson, Camille Dollinger, Heinz Palkowski, Spyridon Zafeiratos, Leandro Jacomine, Daniele Passeri, Marco Rossi, Nihal Engin Vrana, Genevieve Pourroy, Adele Carrado
Titanium (Ti) is the most widely used metal in biomedical applications due to its biocompatibility; however, the significant difference of the mechanical properties between Ti and the surrounding tissues results in stress shielding which is detrimental for load bearing tissues. In the current study, to attenuate the stress shielding effect, a new processing route was developed. It aimed at growing thick poly(methyl methacrylate) (PMMA) layers grafted on Ti substrates to incorporate a polymer component on Ti implants...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29337598/comparative-study-of-intramedullary-hammertoe-fixation
#5
Caterina Obrador, Marta Losa, Ricardo Becerro, Christina A Kabbash
BACKGROUND: Temporary Kirschner wire fixation (K-wire) is a widely used, low-cost fixation method for the correction of hammertoe deformity. Reported complications associated with K-wires prompted the development of new implants over the past decade. However, there is a lack of literature on comparative studies analyzing functional outcomes using validated questionnaires. The purpose of this study was to analyze functional outcomes in patients who had undergone proximal interphalangeal joint fusion using 2 types of intramedullary implant, the Smart Toe and the TenFuse, and to compare them with the outcomes in patients treated with standard K-wire fixation...
January 1, 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29336173/genome-analysis-and-clinical-implications-of-the-bacterial-communities-in-early-biofilm-formation-on-dental-implants-restored-with-titanium-or-zirconia-abutments
#6
Flávia Correa Raffaini, Alice Ramos Freitas, Thalisson Saymo Oliveira Silva, Tarsis Cavagioni, Jessica Felix Oliveira, Rubens Ferreira Albuquerque Junior, Vinícius Pedrazzi, Ricardo Faria Ribeiro, Cássio do Nascimento
This cross-sectional study aimed to identify and quantify up to 42 target species colonizing the early biofilm of dental implants restored with titanium or zirconia abutments. A total of 720 samples from 20 healthy individuals were investigated. Biofilm samples were collected from the peri-implant sulci, inner parts of implants, abutment surfaces and prosthetic crowns over a functioning period of 30 days. Checkerboard DNA-DNA hybridization was used for microbial detection and quantitation. Clinical characteristics (probing depth, bleeding on probing, clinical attachment level and marginal bone loss) were also investigated during the monitoring period...
January 16, 2018: Biofouling
https://www.readbyqxmd.com/read/29335485/electron-beam-melting-in-the-fabrication-of-three-dimensional-mesh-titanium-mandibular-prosthesis-scaffold
#7
Rongzeng Yan, Danmei Luo, Haitao Huang, Runxin Li, Niu Yu, Changkui Liu, Min Hu, Qiguo Rong
The study was designed to fulfill effective work-flow to fabricate three-dimensional mesh titanium scaffold for mandibular reconstruction. The 3D titanium mesh scaffold was designed based on a volunteer with whole mandible defect. (1) acquisition of the CT data; (2) design with computer aided design (CAD) and finite element analysis (FEA). The pore size and intervals with the best mechanic strength was also calculated using FEA. (3) fabrication of the scaffold using electron beam melting (EBM); (4) implantation surgery...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29334989/implantation-of-a-3d-printed-titanium-sternum-in-a-patient-with-a-sternal-tumor
#8
Anton Dzian, Jozef Živčák, Rastislav Penciak, Radovan Hudák
BACKGROUND: Primary malignant or metastatic sternal tumors are uncommon. A subtotal or total sternectomy can offer a radical form of treatment. The issue is to restore the structural integrity of the chest wall. CASE PRESENTATION: We report the implantation of an individualized 3D-printed titanium sternum in a patient with a sternal tumor. CONCLUSIONS: We believe that tridimensional print technologies may also change the strategy of chest wall reconstruction...
January 15, 2018: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/29332500/microstructure-and-mechanical-properties-of-porous-titanium-structures-fabricated-by-electron-beam-melting-for-cranial-implants
#9
Khaja Moiduddin
The traditional methods of metallic bone implants are often dense and suffer from adverse reactions, biomechanical mismatch and lack of adequate space for new bone tissue to grow into the implant. The objective of this study is to evaluate the customized porous cranial implant with mechanical properties closer to that of bone and to improve the aesthetic outcome in cranial surgery with precision fitting for a better quality of life. Two custom cranial implants (bulk and porous) are digitally designed based on the Digital Imaging and Communications in Medicine files and fabricated using additive manufacturing...
January 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29332154/the-influence-of-systemically-or-locally-administered-mesenchymal-stem-cells-on-tissue-repair-in-a-rat-oral-implantation-model
#10
Miya Kanazawa, Ikiru Atsuta, Yasunori Ayukawa, Takayoshi Yamaza, Ryosuke Kondo, Yuri Matsuura, Kiyoshi Koyano
BACKGROUND: Multipotent mesenchymal stem cells (MSCs) are used clinically in regenerative medicine. Our previous report showed systemically injected MSCs improved peri-implant sealing and accelerated tissue healing. However, the risks of systemic MSC administration, including lung embolism, must be considered; therefore, their local application must be assessed for clinical safety and efficacy. We investigated differences in treatment effect between local and systemic MSC application using a rat oral implantation model...
January 13, 2018: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/29331289/titanium-scaffolding-an-innovative-modality-for-salvage-of-failed-first-ray-procedures
#11
Natalie Coriaty, Katherine Pettibone, Nicholas Todd, Shannon Rush, Ryan Carter, Colin Zdenek
Shortening of the first ray is a potential complication associated with first metatarsal procedures. Correction of this deformity conventionally has required the use of a tricortical bone graft to lengthen the bone. Graft complications, including donor site morbidity, poor graft stability, and graft resorption, have revealed a need for an alternative procedure. The present report shows that titanium cage scaffolding has lower extremity applications beyond its previous uses in the ankle and spine. Two patients underwent surgical correction for failed first ray procedures using a titanium cage apparatus with a calcaneal autograft and other biologic agents...
January 11, 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29327779/locally-delivered-ethyl-2-5-dihydroxybenzoate-using-3d-printed-bone-implant-for-promotion-of-bone-regeneration-in-a-osteoporotic-animal-model
#12
B-J Kwon, G M Seon, M H Lee, M-A Koo, M S Kim, D Kim, J-J Han, D Kim, J Kim, J-C Park
Osteoporosis is a disease characterized by low bone mass, most commonly caused by an increase in bone resorption that is not matched by sufficient bone formation. The most common complications of postmenopausal osteoporosis are bone-related defects and fractures. Fracture healing is a multifactorial bone regeneration process, influenced by both biological and mechanical factors related to age, osteoporosis and stability of the osteosynthesis. During the treatment of bone defects in osteoporotic conditions, imbalanced bone remodeling is the leading cause for implant failure...
January 12, 2018: European Cells & Materials
https://www.readbyqxmd.com/read/29326537/total-ossicular-replacement-prosthesis-a-new-fat-interposition-technique
#13
Issam Saliba, Valérie Sabbah, Jackie Bibeau Poirier
Objective: To compare audiometric results between the standard total ossicular replacement prosthesis (TORP-S) and a new fat interposition total ossicular replacement prosthesis (TORP-F) in pediatric and adult patients and to assess the complication and the undesirable outcome. Study design: This is a retrospective study. Methods: This study included 104 patients who had undergone titanium implants with TORP-F and 54 patients who had undergone the procedure with TORP-S between 2008 and 2013 in our tertiary care centers...
2018: Clinical Medicine Insights. Ear, Nose and Throat
https://www.readbyqxmd.com/read/29326508/effect-of-ultraviolet-irradiation-on-the-osseointegration-of-a-titanium-alloy-with-bone
#14
Ashish Yadav, Ranjana Yadav, Aratee Gupta, Akash Baranwal, Atul Bhatnagar, Vakil Singh
Introduction: Attempt has been made to analyze the potential of titanium (Ti) alloy for osteointegration by the effect of surface photo functionalization in different aspects as follows: in Ringer's solution, in vitro cell growth, and in vivo study on rabbit. The present study was aimed to investigate the influence of ultraviolet (UV) light on surface topography, corrosion behavior, and bioactivity of indigenously manufactured samples of Ti alloy mini-implant. Materials and Methods: The study includes surface modification of Ti samples by UV treatment, corrosion testing of the specimens using Potentiostat (GAMRY System), qualitative examination of modified surface topography using scanning electron microscope, and cellular viability test on Ti alloy surface (3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide ASSAY)...
October 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29325889/early-cell-response-of-osteogenic-cells-on-differently-modified-implant-surfaces-sequences-of-cell-proliferation-adherence-and-differentiation
#15
Sebastian Blatt, Andreas Max Pabst, Eik Schiegnitz, Marco Hosang, Thomas Ziebart, Christian Walter, Bilal Al-Nawas, Marcus Oliver Klein
OBJECTIVES: Osseointegration of dental implants is a crucial prerequisite for long-term survival. Therefore, surface modifications are needed to interact with the extracellular environment and to trigger osteogenic cell responses such as cell proliferation, adherence, and differentiation. The purpose of this study was to investigate different surface modifications in vitro over 2 weeks. MATERIALS AND METHODS: Commercially available cells from a human osteogenic cell line (HHOB-c) were cultivated on the following surfaces: titanium with smooth surfaces (polished titanium (P), machined titanium (M), polyetheretherketone (Peek)), titanium with rough and hydrophilised surfaces (acid etched titanium (A), sandblasted acid etched titanium (SA and SA2), sandblasted acid etched hydrophilised (SAH), titanium plasma painted titanium (TPS)), titanium with calcium phosphate-containing surfaces (titanium plasma painted calcium phosphate modified titanium (TPS-CaP), sandblasted calcium phosphate modified titanium (S-CaP), sandblasted acid etched calcium phosphate modified titanium (SA-CaP)), and zirconium-oxide (yttrium amplified zirconium (Z), yttrium amplified Ca2+ delivering zirconium (Z-Ca))...
December 26, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29325887/stiffness-and-strength-of-cranioplastic-implant-systems-in-comparison-to-cranial-bone
#16
Johan Persson, Benedikt Helgason, Håkan Engqvist, Stephen J Ferguson, Cecilia Persson
PURPOSE: The aim of this study was to evaluate skull replacement options after decompressive craniectomy by systematically investigating which combination of geometrical properties and material selection would result in a mechanical response comparable in stiffness to that of native skull bone and a strength as high or higher than the same. MATERIALS AND METHODS: The study was conducted using a Finite Element Model of the top part of a human skull. Native skull bone, autografts and commercial implants made of PEEK, solid titanium, two titanium meshes and a titanium-ceramic composite were modeled under a set load to evaluate deformation and maximum stress...
December 13, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29324528/titanium-elastic-nailing-has-superior-value-to-plate-fixation-of-midshaft-femur-fractures-in-children-5-to-11-years
#17
Jerad D Allen, Kevin Murr, Ferras Albitar, Cale Jacobs, Eric S Moghadamian, Ryan Muchow
BACKGROUND: American Academy of Orthopaedic Surgeons (AAOS) Clinical Practice Guidelines for pediatric femoral shaft fractures indicate titanium elastic nails (TENs) for children 5 to 11 years old. Growing evidence suggests these fractures may also be treated with open or submuscular plating. The purpose of this study was to compare estimated blood loss (EBL), operative time, fluoroscopy time, cost, and subjective and objective pain scores between TENs and plating techniques used in 5- to 11-year-old children with midshaft femur fractures based on length stability...
January 10, 2018: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/29324511/evolutionary-improvements-in-the-jarvik-2000-left-ventricular-assist-device
#18
Craig H Selzman, Antigone Koliopoulou, Jason P Glotzbach, Stephen H McKellar
Mechanical circulatory support devices experience a wide range of operating conditions during patient use. Since its first implant in June 2000, the Jarvik 2000 left ventricular assist device has witnessed systematic stepwise modifications to reduce the risk of serious adverse events and improve patient outcomes. Over time, clinical experience revealed a number of low-incidence failure modes that presented opportunities for improvement. Design changes have included, but are not limited to, a Y cable to permit battery changes without pump stoppage, increased pull strength of external cables from 35 to 200 lbs, an intermittent low-speed controller to improve aortic root washout, sintered titanium microsphere surface on the pump housing to prevent apical thrombus, and novel cone bearings to reduce thrombus formation...
January 10, 2018: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29322629/material-dependent-fretting-corrosion-in-spinal-fusion-devices-evaluation-of-onset-and-long-term-response
#19
Vaneet Singh, Jacob P Shorez, Sachin A Mali, Nadim J Hallab, Jeremy L Gilbert
Posterior spinal fusion implants include number of interconnecting components, which are subjected to micromotion under physiological loading conditions inducing a potential for fretting corrosion. There is very little known about the fretting corrosion in these devices in terms of the minimum angular displacement (threshold) necessary to induce fretting corrosion or the amount of fretting corrosion that can arise during the life of the implant. Therefore, the first goal was to evaluate the threshold fretting corrosion in three anatomical orientations and second the long-term fretting corrosion for the three different material types of spinal implants under physiological loading conditions...
January 10, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29319546/influence-of-the-presence-of-alveolar-mucosa-at-implants-a-histological-study-in-humans
#20
Yasushi Nakajima, Adriano Piattelli, Giovanna Iezzi, Natalia Fortich Mesa, Mauro Ferri, Daniele Botticelli
OBJECTIVE: To evaluate the influence of the presence or absence of keratinized mucosa on hard and soft tissues around implants. MATERIAL AND METHODS: Sixteen volunteers with edentulous regions in the distal aspect of the mandible participated in the study. In each patient, 2 solid titanium screw-shaped devices, 3.5 mm in diameter and 5 mm long, were installed. The incision of the mucosa was performed in such a way to allow that, after the suture of the flaps, only the alveolar mucosa surround the test sites and the keratinized mucosa surround the control implants...
January 9, 2018: Implant Dentistry
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