Evaluation of strain field in microstructures using micro-CT and digital volume correlation

Jiroušek, Ondřej; Jandejsek, Ivan; Vavřı́k, Daniel

doi:10.1088/1748-0221/6/01/c01039

Cited by 39 publications

(25 citation statements)

References 5 publications

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“…In laboratory, mechanical strains in bone-teeth and bone-implant complexes have been investigated using several methods including strain gauges (Akça et al, 2007; Asundi and Kishen, 2000a; Jantarat et al, 2001; Popowics et al, 2004), photoelasticity (Asundi and Kishen, 2001, 2000b), Moiré interferometry (Kishen et al, 2006; Wang and Weiner, 1998; Wood et al, 2003), electronic speckle pattern interferometry (ESPI) (Zaslansky et al, 2006, 2005), finite element method (Baggi et al, 2008; Bozkaya et al, 2004; Van Oosterwyck et al, 1998; Wazen et al, 2013) and digital image correlation (DIC) (Qian et al, 2009; Tiossi et al, 2011; Zhang et al, 2009). Digital volume correlation (DVC) has been used to map strains in trabecular bone, without teeth or an implant (Bay et al, 1999; Jiroušek et al, 2011; Verhulp et al, 2004; Zauel et al, 2006). …”

Section: Introductionmentioning

confidence: 99%

Biomechanics and strain mapping in bone as related to immediately-loaded dental implants

Lee

Jang

et al. 2015

Journal of Biomechanics

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The effects of alveolar bone socket geometry and bone-implant contact on implant biomechanics, and resulting strain distributions in bone were investigated. Following extraction of lateral incisors on a cadaver mandible, immediate implants were placed and bone-implant contact area, stability and bone strain were measured. In situ biomechanical testing coupled with micro X-ray microscope (μ-XRM) illustrated less stiff bone-implant complexes (701-822 N/mm) compared with bone-periodontal ligament (PDL)-tooth complexes (791-913 N/mm). X-ray tomograms illustrated that the cause of reduced stiffness was due to reduced and limited bone-implant contact. Heterogeneous elemental composition of bone was identified by using energy dispersive X-ray spectroscopy (EDS). The novel aspect of this study was the application of a new experimental mechanics method, that is, digital volume correlation, which allowed mapping of strains in volumes of alveolar bone in contact with a loaded implant. The identified surface and subsurface strain concentrations were a manifestation of load transferred to bone through bone-implant contact based on bone-implant geometry, quality of bone, implant placement, and implant design. 3D strain mapping indicated that strain concentrations are not exclusive to the bone-implant contact regions, but also extend into bone not directly in contact with the implant. The implications of the observed strain concentrations are discussed in the context of mechanobiology. Although a plausible explanation of surgical complications for immediate implant treatment is provided, extrapolation of results is only warranted by future systematic studies on more cadaver specimens and/or in vivo small scale animal models.

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Section: Introductionmentioning

confidence: 99%

Biomechanics and strain mapping in bone as related to immediately-loaded dental implants

Lee

Jang

et al. 2015

Journal of Biomechanics

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“…The spatial strain distribution was assessed utilizing DVC, which is an extension of the image-registration techniques to three dimensions. 10 Linearization of the attenuation range (a beamhardening correction) was applied to reduce the noise and improve the contrast of individual projections. 11 Due to a high porosity of the samples and a small thickness of the trabeculae (approximately 200 μm), the cone-beam reconstruction algorithm 12 was used to eliminate the distortion of the reconstructed data caused by the divergent nature of the X-ray beam.…”

Section: Microtomography Measurementmentioning

confidence: 99%

Deformation behaviour of a natural-shaped bone scaffold

Kytýř¹,

Doktor²,

Jiroušek³

et al. 2016

Mater. Tehnol.

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The study aims at mechanical testing of an artificial bone structure in the form of a scaffold for the application in the repairs of trabecular bones after wounds or degenerative diseases. Such artificial construct has to conform to many requirements including biocompatibility, permeability properties and bone-integration characteristics. Recently, self-degradable bone scaffolds suitable for natural-bone-tissue ingrowth optimized with respect to mechanical properties and body-fluid flow have been considered as an alternative to allografts and autografts. Here, an analysis of deformation behaviour of a scaffold with a morphology identical to the natural bone is the first step in this task. In this work, the geometry and morphology of scaffold specimens produced with direct 3D printing were based on a 3D model derived from the X-ray-computed micro-tomography measurement of a real trabecular bone. The geometrical model was upscaled four times in order to achieve the optimum ratio between its resolution and the resolution of the 3D printer. For its biocompatibility and self-degradability, polylactic acid was used as the printing material. The mechanical characteristics were obtained from a series of uniaxial compression tests, with an optical evaluation of the strain field on the surfaces of the specimens. The acquired stress-strain curves were compared with the characteristics of a real trabecular bone obtained with time-lapse microtomography measurements, evaluated with the digital volumetric correlation method. The results show good correspondence of the stiffness values for both the natural and artificial bone specimens. Keywords: bone scaffold, polylactic acid, additive manufacturing, compression loading, microtomography Namen {tudije je mehansko preizku{anje umetnega ogrodja kosti za obnovo trabekularnih kosti po po{kodbah ali degenerativnih boleznih. Tako umetno ogrodje mora ustrezati mnogim zahtevam, kot so biokompatibilnost, prepustnost in mo`nost vra{~anja kostnega tkiva. Samo razgradljivo ogrodje kosti, primerno za naravno vra{~anje kostnega tkiva, optimirano glede na mehanske lastnosti in toka telesnih teko~in, je bilo prou~evano kot nadomestek za presajanje tujega ali lastnega tkiva. Prvi korak pri tej nalogi je analiza obna{anja ogrodja, z morfologijo podobno naravni kosti. V tem delu je bila geometrija in morfologija vzor~nega ogrodja izdelana z neposrednim tridimenzionalnim tiskanjem, na osnovi tridimenzionalnega modela, dobljenega z meritvami s pomo~jo rentgenske tomografije realne trabekularne kosti. Geometrijski model je bil pove~an {tirikrat, da bi dobili optimalno razmerje med njegovo resolucijo in resolucijo tridimenzionalnega tiskalnika. Za biokompatibilnost in sâmo razgradljivost, je bila za tiskanje uporabljena polilakti~na kislina. Mehanske zna~ilnosti so bile dobljene z vrsto enoosnih tla~nih preizkusov in z opti~no oceno napetostnega polja na povr{ini vzorcev. Pridobljene krivulje napetost-raztezek so bile primerjane z zna~ilnostmi realne trabekularne kosti, ki so bile dobljene z zaporedn...

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“…The experimental setup used in the present study has successfully been applied to a number of material systems including bones 10,11 and carbon-carbon textile composites. 6 It consists of large-area flat panel sensor and microfocus X-ray source.…”

Section: X-ray Microtomographymentioning

confidence: 99%

Multi‐Scale Modeling of Textile Reinforced Ceramic Composites

Vorel

Urbanová

Grippon³

et al. 2013

Ceramic Engineering and Science Proceedings

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The present paper describes a two-step homogenization for the evaluation of effective elastic properties of textile reinforced ceramic composites. Attention is devoted to polysiloxane matrix based composites reinforced by plain weave textile fabrics. Basalt and carbon reinforcements are considered. X-ray microtomography as well as standard image analysis is utilized to estimate the volume fraction, shape and distribution of major porosity which considerably influences the resulting macroscopic response. The numerical procedure effectively combines the Mori-Tanaka averaging scheme and finite element simulation carried out on a suitable statistically equivalent periodic unit cell. The computational strategy employs the popular extended finite element method to avoid difficulties associated with meshing relatively complex geometries on the meso-scale. Comparison with the results obtained directly from the finite element simulations of available /iCT projections together with experimental data derived from measurements of phase velocities of ultrasonic waves is also provided.

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Evaluation of strain field in microstructures using micro-CT and digital volume correlation

Cited by 39 publications

References 5 publications

Biomechanics and strain mapping in bone as related to immediately-loaded dental implants

Biomechanics and strain mapping in bone as related to immediately-loaded dental implants

Deformation behaviour of a natural-shaped bone scaffold

Multi‐Scale Modeling of Textile Reinforced Ceramic Composites

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