Large-sliding contact elements accurately predict levels of bone–implant micromotion relevant to osseointegration

Viceconti, Marco; Muccini, Roberto; Bernakiewicz, Marek; Baleani, Massimiliano; Cristofolini, Luca

doi:10.1016/s0021-9290(00)00140-8

Cited by 261 publications

(190 citation statements)

References 26 publications

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“…Each part of the assembly was given appropriate material properties as adopted in previous studies 14,15 (Table 1). Homogeneity, isotropy, and linear elasticity were assumed for both the OMI and bone, and a friction coefficient of 0.3 16,17 between the microimplant and both cortical and cancellous parts was assigned, while contact between the latter two parts was assigned as an intimate with no friction.…”

Section: Methodsmentioning

confidence: 99%

Optimal force magnitude loaded to orthodontic microimplants: A finite element analysis

Alrbata

Momani

Al-Tarawneh

et al. 2015

The Angle Orthodontist

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Objective: To find an optimal force that can be loaded onto an orthodontic microimplant to fulfill the biomechanical demands of orthodontic treatment without diminishing the stability of the microimplant. Materials and Methods: Using the finite element analysis method, 3-D computer-aided design models of a microimplant and four cylindrical bone pieces (incorporating cortical bone thicknesses of 0.5, 1.2, 2.0, and 3.0 mm) into which the microimplant was inserted were used. Various force magnitudes of 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, and 4.0 N were then horizontally and separately applied to the microimplant head as inserted into the different bone assemblies. For each bone/ force assembly tested, peak stresses developed at areas of intimate contact with the microimplant along the force direction were then calculated using regression analysis and compared with a threshold value at which pathologic bone resorption might develop. Results: The resulting peak stresses showed that bone pieces with thicker cortical bone tolerated higher force magnitudes better than did thinner ones. For cortical bone thicknesses of 0.5, 1.2, 2.0, and 3.0 mm, the maximum force magnitudes that could be applied safely were 3.75, 4.1, 4.3, and 4.45 N, respectively. Conclusions: For the purpose of diminishing orthodontic microimplant failure, an optimal force that can be safely loaded onto a microimplant should not exceed a value of around 3. 75-4.5 N. (Angle Orthod. 2016;86:221-226.)

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Section: Methodsmentioning

confidence: 99%

Optimal force magnitude loaded to orthodontic microimplants: A finite element analysis

Alrbata

Momani

Al-Tarawneh

et al. 2015

The Angle Orthodontist

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“…This choice significantly decreases the computational cost required for the stability analysis based on a non-linear frictional contact model (Viceconti et al, 2000).…”

Section: D Fem Model Of the Femurmentioning

confidence: 99%

“…Finally, more detailed models on bone resorption (Boyle and Kim, 2011a, b;Weinans et al, 1992a;Weinans et al, 1992b) and implant stability (Abdul-Kadir et al, 2008;Viceconti et al, 2006;Viceconti et al, 2001;Viceconti et al, 2000) could be used to assess both the short and long term performance of the implant.…”

mentioning

confidence: 99%

Fatigue design of a mechanically biocompatible lattice for a proof-of-concept femoral stem

Khanoki

Pasini

2013

Journal of the Mechanical Behavior of Biomedical Materials

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A methodology is proposed to design a spatially periodic microarchitectured material for a twodimensional femoral implant under walking gait conditions. The material is composed of a graded lattice with controlled property distribution that minimizes concurrently bone resorption and interface failure. The periodic microstructure of the material is designed for fatigue fracture caused by cyclic loadings on the hip joint as a result of walking. The bulk material of the lattice is Ti6AL4V and its microstructure is assumed free of defects. The Soderberg diagram is used for the fatigue design under multiaxial loadings. Two cell topologies, square and Kagome, are chosen to obtain optimized property gradients for a two-dimensional implant. Asymptotic homogenization (AH) theory is used to address the multiscale mechanics of the implant as well as to capture the stress and strain distribution at both the macro and the microscale. The microstress distribution found with AH is also compared with that obtained from a detailed finite element analysis. For the maximum value of the von Mises stress, we observe a deviation of 18.6 % in unit cells close to the implant boundary, where the AH assumption of spatial periodicity of the fluctuating fields ceases to hold. In the second part of the paper, the metrics of bone resorption and interface shear stress are used to benchmark the graded cellular implant with existing prostheses made of fully dense titanium implant.The results show that the amount of initial postoperative bone loss for square and kagome lattice implants decreases, respectively, by 53.8% and 58%. In addition, the maximum shear interface failure at the distal end is significantly reduced by about 79%.A set of proof-of-concepts of planar implants have been fabricated via Electron Beam Melting (EBM) to demonstrate the manufacturability of Ti6AL4V into graded lattices with alternative cell size. Optical microscopy has been used to measure the morphological parameters of the cellular microstructure, including cell wall thickness and pore size, and compared them with the nominal values. No sign of fracture or incomplete cell walls was observed, an assessment that shows the satisfactory metallurgical bond of cell walls and the structural integrity of the implants.

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“…Osseointegration refers to the bone healing process. The incapability of the implant surface to bond with the adjoining bone and tissues leads to micro-motions and formation of a fibrous tissue around the implant promoting aseptic loosening process (Viceconti, Muccini et al 2000;Geetha, Singh et al 2008). The biocompatibility for total joint replacements has been defined as; optimizing the rate and quality of bone apposition to the material, minimizing the release rate of corrosion and the tissue response to the released particles, minimizing the release rate of wear debris and the tissue reaction to this debris, and optimizing the biomechanical environment to minimize disturbance to homeostasis in the bone and its surrounding soft tissue (Williams 2008).…”

Section: Biomaterials Requirements For Femoral Componentmentioning

confidence: 99%

NiTi Shape Memory Alloys, Promising Materials in Orthopedic Applications

Bahraminasab¹,

Sahari²

2013

Shape Memory Alloys - Processing, Characterization and Applications

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Large-sliding contact elements accurately predict levels of bone–implant micromotion relevant to osseointegration

Cited by 261 publications

References 26 publications

Optimal force magnitude loaded to orthodontic microimplants: A finite element analysis

Optimal force magnitude loaded to orthodontic microimplants: A finite element analysis

Fatigue design of a mechanically biocompatible lattice for a proof-of-concept femoral stem

NiTi Shape Memory Alloys, Promising Materials in Orthopedic Applications

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