Friction properties of the interface between porous-surfaced metals and tibial cancellous bone (original) (raw)
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Interface between titanium 6,4 alloy implants and bone
International journal of oral and maxillofacial surgery, 1987
This paper presents the results of animal studies on the interface between 6 aluminum, 4 vanadium, titanium alloy and bone. 7 New Zealand white rabbits were anaesthetised and a new design of threaded implant inserted into the tibial metaphysis of each leg. 3 further animals had fine lathe turnings inserted in the same site. The animals were sacrificed 7 weeks later and the implants removed together with the surrounding bone. After suitable processing of the specimens, they were subjected to scanning and transmission electron microscope studies. Compact bone was found in close proximity to the surface of the metal. With higher magnifications, the bone was found to be in intimate contact with the metal. There was no suggestion of the presence of cells or uncalcified collagen fibres between the bone and the implant. At the highest magnification, there was the appearance of a homogenous transition from the bone to the metal, suggesting a biological adhesion.
Materials science & engineering. C, Materials for biological applications, 2018
The purpose of this study was to analyze the stress distribution of bone tissue around implants with different implant-abutment interfaces: platform switching (PSW); external hexagon (EH) and Morse taper (MT) with different diameters (regular: Ø 4 mm and wide: Ø 5 mm), bone types (I-IV) and subjected to axial and oblique load conditions using three-dimensional finite element analysis (3D-FEA). Sixteen 3D models of various configurations were simulated using InVesalius, Rhinoceros 3D 4.0, and SolidWorks 2011 software, and processed using Femap 11.2 and NeiNastran 11.0 programs. Axial and oblique forces of 200 N and 100 N, respectively, applied at the occlusal surface of prostheses. Maximum principal stress values were obtained from the peri-implant cortical bone of each model. Statistical analyses were performed using ANOVA and Tukey's test for maximum principal stress values. Oblique loading showed higher tensile stress than axial loading (P < 0.001). Wide-diameter implants s...
Achieving a stable bone-implant interface is an important factor in the long-term outcome of joint arthroplasty. In this study, we employed an ovine bicortical model to compare the bone-healing response to five different surfaces on titanium alloy implants: grit blasted (GB), grit blasted plus hydroxyapatite (50 m thick) coating (GBHA), Porocoat (PC), Porocoat with HA (PCHA) and smooth (S). Push-out testing, histology, and backscatter scanning electron microscope (SEM) imaging were employed to assess the healing response at 4, 8, and 12 weeks. Push-out testing revealed PC and PCHA surfaces resulted in significantly greater mechanical fixation over all other implant types at all time points (p < .05). HA coating on the grit-blasted surface significantly improved fixation at 8 and 12 weeks (p < .05). The addition of HA onto the porous coating did not significantly improve fixation in this model. Quantification of ingrowth/ongrowth from SEM images revealed that HA coating of the grit-blasted surfaces resulted in significantly more ongrowth at 4 weeks (p < .05).
A finite element model for evaluation of tibial prosthesis-bone interface in total knee replacement
Journal of Biomechanics, 1992
A numerical model based on the finite element method was developed for the load transfer analysis at the tibia1 bone-implant interfaces in total knee replacement. A transverse isotropic material model, based on a quadratic elastic potential and on Hill's quadratic yield criterion, was next developed for bone constitutive laws. The bone-cement and bone-prosthesis interfaces were both assumed to be discontinuous. A dry friction model based on Coulombs criterion was adopted for the interfaces friction. The model was shown to be able to give compressive and shear stresses distributions and distractive and relative shear micromotions at these interfaces. A preliminary application was conducted for cemented metal tray total condylar (MTTC) and for cemented and uncemented porous coated anatomic (PCA) tibia1 plateaus. The PCA plateaus were found to be more deformable and had greater global displacements than the MTTC one. Debonding of the bone-peg interface was observed for the uncemented PCA. Correspondingly, the stress peaks at the interface beneath the tray were lower for the PCA than for the MTTC. Shear micromotions appeared under the tray for both the two prostheses. We observed that bone anisotropy and interface discontinuity affected the results sensibly.
Workshop on the bone-joint implant interface
Journal of Orthopaedic Research, 1985
A workshop on the bone-implant interface, as related to loosening of total joint implants, was held in Chicago on September [14][15][16] 1983. More than 60 orthopaedic clinicians and researchers and basic connective tissue biologists met to review problems and potential solutions to joint implant loosening. The following is a synopsis of the presentations and discussions.
Biomechanical factors affecting the bone-dental implant interface
Clinical materials, 1992
as the differences in bone density make differences in bone to implant contact. b) Available remaining bone after extraction, which has a direct influence in choosing the width and the length of the implant, affecting the surface area and the bone to implant contact. c) Parafunctional habits, which increase time, magnitude, direction, and distribution of the forces affecting bone to implant contact. Forces and loading conditions applied on the implant Implant-related factors: a) Implant macro design (implant body, length and diameter, threads shape, pitch, lead, depth and width, and crest module), implant design is mainly responsible for 1-increase the surface area of the implant, 2-decrease the stress in addition to 3-distributing the forces on the bone and convert the stresses into favorable compressive stresses. b) Chemical composition and biomaterial of the implant and its relation to biocompatibility, enhancing healing, modulus of elasticity. c) Implant surface treatment and coatings (surface topography), responsible for increase the surface area of the BIC, decrease the stresses, enhance adhesion qualities to the bone-implant interface at initial healing.
Bone-Implant Interface in Orthopedic Surgery
2014
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