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On the material dependency of peri-implant morphology and stability in healing bone

Bioactive Materials 2023年第10期28卷 155-166页

作者： Stefan Bruns Diana Krüger Silvia Galli D.C.Florian Wieland Jorg U.Hammel felix beckmann Ann Wennerberg Regine Willumeit-Romer Berit Zeller-Plumhoff Julian Moosmann Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Str.121502GeesthachtGermany University of Malmo Faculty of OdontologyDepartment of ProsthodonticsCarl Gustafs Vag 34Klerken20506MalmoSweden Institute of Materials Physics Helmholtz-Zentrum HereonMax-Planck-Str.121502GeesthachtGermany University of Gothenburg Institute of OdontologyDepartment of ProsthodonticsMedicinaregatan 12 f41390GoteborgSweden

The microstructural architecture of remodeled bone in the peri-implant region of screw implants plays a vital role in the distribution of strain energy and implant *** present a study in which screw implants made from titanium,polyetheretherketone and biodegradable magnesium-gadolinium alloys were implanted into rat tibia and subjected to a push-out test four,eight and twelve weeks after *** were 4 mm in length and with an M2 *** loading experiment was accompanied by simultaneous three-dimensional imaging using synchrotron-radiation microcomputed tomography at 5μm *** deformation and strains were tracked by applying optical flow-based digital volume correlation to the recorded image *** stabilities measured for screws of biodegradable alloys were comparable to pins whereas non-degradable biomaterials experienced additional mechanical ***-implant bone morphology and strain transfer from the loaded implant site depended heavily on the biomaterial *** implants stimulated rapid callus formation displaying a consistent monomodal strain profile whereas the bone volume fraction in the vicinity of magnesium-gadolinium alloys exhibited a minimum close to the interface of the implant and less ordered strain *** in our data suggest that implant stability benefits from disparate bone morphological properties depending on the biomaterial *** leaves the choice of biomaterial as situational depending on local tissue properties.

关键词： Biodegradable implant materials Bone mechanical testing Implant stability Synchrotron micro-computed tomography imaging Digital volume correlation

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Degradation behavior and osseointegration of Mg-Zn-Ca screws in different bone regions of growing sheep:a pilot study

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Regenerative Biomaterials 2023年第1期10卷 1-14页

作者： Romy Marek Hanna C´wieka Nicholas Donohue Patrick Holweg Julian Moosmann felix beckmann Iva Brcic Uwe Yacine Schwarze Kamila Iskhakova Marwa Chaabane Sandra Sefa Berit Zeller-Plumhoff Annelie-Martina Weinberg Regine Willumeit-Ro¨mer Nicole Gabriele Sommer Department of Orthopaedics and Traumatology Medical University of Graz8010 GrazAustria Institute of Metallic Biomaterials Helmholtz-Zentrum Hereon GmbH21502 GeesthachtGermany National Institute for Bioprocessing Research and Training University College DublinDublin 4Ireland Institute of Materials Physics Helmholtz-Zentrum Hereon GmbH21502 GeesthachtGermany D&R Institute of Pathology Medical University of Graz8010 GrazAustria Department of Dental Medicine and Oral Health Medical University of Graz8010 GrazAustria SCANCO Medical AG 8306 Wangen-BruttisellenSwitzerland

Magnesium(Mg)-based implants are highly attractive for the orthopedic field and may replace titanium(Ti)as support for fracture *** determine the implant-bone interaction in different bony regions,we implanted Mg-based alloy ZX00(Mg<0.5 Zn<0.5 Ca,in wt%)and Ti-screws into the distal epiphysis and distal metaphysis of sheep *** implant degradation and osseointegration were assessed in vivo and ex vivo after 4,6 and 12weeks,using a combination of clinical computed tomography,medium-resolution micro computed tomography(mCT)and high-resolution synchrotron radiation mCT(SRmCT).Implant volume loss,gas formation and bone growth were evaluated for both implantation sites and each bone region ***,histological analysis of bone growth was performed on embedded hard-tissue *** demonstrate that in all cases,the degradation rate of ZX00-implants ranges between 0.23 and 0.75mm/*** highest degradation rates were found in the ***-to-implant contact varied between the time points and bone types for both ***,bone-volume-to-total-volume was higher around ***,we found an increased cortical thickness around the ZX00-screws when compared with the *** results showed the suitability of ZX00-screws for implantation into the distalmeta-and epiphysis.

关键词： biodegradable implants magnesium-based alloys computed tomography Mg-Zn-Ca sheep histology

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