Global biomechanical model for dental implants

Hansson, Stig; Löberg, Johanna; Mattisson, Ingela; Ahlberg, Elisabet

doi:10.1016/j.jbiomech.2011.02.002

Cited by 23 publications

(10 citation statements)

References 18 publications

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“…The calculated results showed a trend similar to the interfacial shear strength results reported in vivo but the absolute values calculated are too high compared with the experimentally measured interfacial shear strengths (Hansson et al 2010). More compatible values can be obtained by also including the design of the implant, the bone anatomy and the bone quality (Hansson et al 2011). However, surface topography is not the only way of enhancing bone‐to‐implant contact (BIC) as chemical surface modifications have also resulted in faster osseointegration (Sul et al 2006) despite a less rough surface than considered optimal for bone ingrowth (Sul et al 2009; Wennerberg & Albrektsson 2010).…”

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confidence: 99%

Enhanced implant integration with hierarchically structured implants: a pilot study in rabbits

Johansson

Gretzer²,

Jimbo

et al. 2011

Clin. Oral. Implants. Res.

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confidence: 99%

Enhanced implant integration with hierarchically structured implants: a pilot study in rabbits

Johansson

Gretzer²,

Jimbo

et al. 2011

Clin. Oral. Implants. Res.

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“…There is only a slight difference between the S a values for the TS + 8 nm and TS + 22 nm surfaces, but the lower value obtained for the smaller particles indicates that the curvature of the particles are reflected in the surface roughness. The root mean square of the slope ( S dq ) has been shown to correlate with the interface shear strength and is thus an important parameter to investigate for dental implant applications [28, 29]. From a biomechanical point of view, a large S dq value is desired giving the TS + P25 surface an advantage.…”

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confidence: 99%

Electronic Properties ofTiO2Nanoparticles Films and the Effect on Apatite-Forming Ability

Löberg

Holmberg

Mattisson

et al. 2013

International Journal of Dentistry

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Nanoparticle-covered electrodes have altered properties as compared to conventional electrodes with same chemical composition. The changes originate from the large surface area and enhanced conduction. To test the mineralization capacity of such materials, TiO2 nanoparticles were deposited on titanium and gold substrates. The electrochemical properties were investigated using cyclic voltammetry and impedance spectroscopy while the mineralization was tested by immersion in simulated body fluid. Two types of nucleation and growth behaviours were observed. For smooth nanoparticle surfaces, the initial nucleation is fast with the formation of few small nuclei of hydroxyapatite. With time, an amorphous 2D film develops with a Ca/P ratio close to 1.5. For the rougher surfaces, the nucleation is delayed but once it starts, thick layers are formed. Also the electronic properties of the oxides were shown to be important. Both density of states (DOS) in the bandgap of TiO2 and the active area were determined. The maximum in DOS was found to correlate with the donor density (N d) and the active surface area. The results clearly show that a rough surface with high conductivity is beneficial for formation of thick apatite layers, while the nanoparticle covered electrodes show early nucleation but limited apatite formation.

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“…The anodized surfaces also show higher S dq values compared with the reference. According to the biomechanical model recently developed, a higher S dq value indicates larger interfacial retentions strength with the bone and in consequence better osseointegration.…”

Section: Resultsmentioning

confidence: 99%

Electronic properties of anodized TiO₂ electrodes and the effect on in vitro response

et al. 2013

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For dental implants, improved osseointegration is obtained by modifying the surface roughness as well as oxide morphology and composition. A combination of different effects contributes to enhanced performance, but with surface roughness as the dominant factor. To single out the effect of oxide conductivity on biological response, oxide films with similar thickness and surface roughness but different electronic properties were formed using galvanostatic anodization. Three different current densities were used, 2.4, 4.8, and 11.9 mA cm(-2) , which resulted in growth rates ranging from 0.2 to 2.5 V s(-1) . The electronic properties were evaluated using cyclic voltammetry and impedance spectroscopy, while the biological response was studied by cell activity and apatite formation. The number of charge carrier in the oxide film close to the oxide/solution interface decreased from 5.8 × 10(-19) to 3.2 × 10(-19) cm(-2) with increasing growth rate, that is, the conductivity decreased correspondingly. Cell response of the different surfaces was tested in vitro using human osteoblast-like cells (MG-63). The results clearly show decreased osteoblast proliferation and adhesion but higher mineralization activity for the oxide with lower conductivity at the oxide/solution interface. The apatite-forming ability was examined by immersion in simulated body fluid. At short times the apatite coverage was ∼26% for the anodized surfaces, significantly larger than for the reference with only 3% coverage. After 1 week of immersion the apatite coverage ranged from 73 to 56% and a slight differentiation between the anodized surfaces was obtained with less apatite formation on the surface with lower conductivity, in line with the cell culture results.

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Global biomechanical model for dental implants

Cited by 23 publications

References 18 publications

Enhanced implant integration with hierarchically structured implants: a pilot study in rabbits

Enhanced implant integration with hierarchically structured implants: a pilot study in rabbits

Electronic Properties ofTiO2Nanoparticles Films and the Effect on Apatite-Forming Ability

Electronic properties of anodized TiO₂ electrodes and the effect on in vitro response

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Global biomechanical model for dental implants

Cited by 23 publications

References 18 publications

Enhanced implant integration with hierarchically structured implants: a pilot study in rabbits

Enhanced implant integration with hierarchically structured implants: a pilot study in rabbits

Electronic Properties ofTiO2Nanoparticles Films and the Effect on Apatite-Forming Ability

Electronic properties of anodized TiO2 electrodes and the effect on in vitro response

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Product

Resources

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Electronic properties of anodized TiO₂ electrodes and the effect on in vitro response