<i>In situ</i>microradioscopy and microtomography of fatigue-loaded dental two-piece implants

Wiest, Wolfram; Zabler, Simon; Rack, Alexander; Fella, Christian; Balles, Andreas; Nelson, Katja; Schmelzeisen, Rainer; Hanke, Randolf

doi:10.1107/s1600577515015763

Cited by 20 publications

(9 citation statements)

References 25 publications

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“…Similar results regarding the favorable sealing capacity of conical connections were shown previously using real‐time radioscopy with synchrotron light sources and using a finite element study, which showed that no microgap occurred in the case of a conical IAC …”

Section: Discussionsupporting

confidence: 87%

The micromechanical behavior of implant‐abutment connections under a dynamic load protocol

Schlee

Weigl

Ratka

et al. 2018

Clin Implant Dent Rel Res

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Section: Discussionsupporting

confidence: 87%

The micromechanical behavior of implant‐abutment connections under a dynamic load protocol

Schlee

Weigl

Ratka

et al. 2018

Clin Implant Dent Rel Res

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“…The experimental results support the use of FE modeling which is already widely used to assess the biomechanical behavior of dental implants [ 21 , 22 ]. So far, the results only consider static off-axis loading of virgin implant systems, and can thus not predict cyclic damage caused by fatigue loading.…”

Section: Discussionsupporting

confidence: 61%

“…Hence, the FE model is a useful approach. More sophisticated methods for high resolution spatial measurements, such as the recently developed stroboscopic 4D microtomography of dental implants, are only required in a final stage of the implant development [22] .…”

Section: Discussionmentioning

confidence: 99%

Validation of finite-element simulations with synchrotron radiography – A descriptive study of micromechanics in two-piece dental implants

Wiest

Rack

Zabler

et al. 2018

Heliyon

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State-of-the art, two-piece dental implants made from titanium alloys exhibit a complex micromechanical behavior under dynamical load. Its understanding, especially the formation of microgaps, is of crucial importance in order to predict and improve the long-term performance of such implants. Microgap formation in a loaded dental implant with a conical implant-abutment connection can be studied and quantified by synchrotron radiography with micrometer accuracy. Due to the high costs and limited access to synchrotron radiation sources, alternative approaches are needed in order to depict the microgap formation. Therefore, synchrotron radiography is used in this article to validate a simple finite element model of an experimental conical implant design. Once validated, the model is in turn employed to systematically study the microgap formation developed in a variety of static load scenarios and the influence of the preload of abutment screw on the microgap formation. The size of the microgap in finite element analysis (FEA) simulations is consistent with that found in in-vitro experiments. Furthermore, the FE approach gives access to more information such as the von-Mises stresses. It is found that the influence of the abutment screw preload has only a minor effect on the microgap formation and local stress distribution. The congruence between FE simulations and in-vitro measurements at the micrometer scale underlines the validity and relevance of the simple FE method applied to study the micromovement of the abutment and the abutment screw preload in conical implant-abutment connections under load.

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“…Commonly, highly specialised equipment is required in order to target one specific type of investigation. Selected highlights available in the literature are for example the study of dental implants under periodic load (chewing simulator) [26], tensile fatigue tests with tomographic acquisition rates of up to 20 Hz [27] or dedicated rigs to create conditions similar to those subsurface or at 10 km depth inside the earth crust (pressure, temperature and flow) [28,29]. This article sets its focus on axial load (up to 500 N) and high spatial resolution in the range of a few micrometer or less.…”

Section: Introductionmentioning

confidence: 99%

TomoPress—In Situ Synchrotron-Based Microtomography under Axial Load

et al. 2020

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Computed tomography (CT) with hard X-rays is a mature technique that is in regular use to depict the interior of opaque specimens with spatial resolutions up to the micrometre range (microtomography or µCT). Short acquisition times and sophisticated contrast modes are accessible when synchrotron light sources are combined with microtomography—SR-µCT. Both features render SR-µCT as excellent probe to study delicate samples in situ, for example under mechanical load by deploying corresponding sample environments. The so-called TomoPress is such a device available within the public user programme of tomography beamline ID19 of the European Synchrotron Radiation Facility (ESRF). It allows one to study samples under high axial load (up to 500 N) with high spatial resolution up to the micrometer range. Different gauges are installed to allow online monitoring of the applied force. Constant humidity, temperature and wetting are routinely available as well. The article shall outline basic design principles of the press as well as parameters for its utilisation in a descriptive manner. Selected examples underline the potential of the device for such diverse fields as biomedical research, life sciences and materials research.

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In situmicroradioscopy and microtomography of fatigue-loaded dental two-piece implants

Abstract: Results of a novel in situ microradiography and microtomography setup for the study of fatigue processes are presented. This setup is optimized for the requirements of dental implants and use at synchrotron imaging beamlines.

Cited by 20 publications

References 25 publications

The micromechanical behavior of implant‐abutment connections under a dynamic load protocol

The micromechanical behavior of implant‐abutment connections under a dynamic load protocol

Validation of finite-element simulations with synchrotron radiography – A descriptive study of micromechanics in two-piece dental implants

TomoPress—In Situ Synchrotron-Based Microtomography under Axial Load

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