Enhancing bone regeneration by calcium phosphates with surface topography: A translational evaluation of synthetic bone graft substitutes

Lukas A. van Dijk

    Research output: ThesisDoctoral thesis 1 (Research UU / Graduation UU)

    2 Downloads (Pure)

    Abstract

    The overall aim of this thesis was to determine if and how topography of calcium phosphates can be improved for increased efficacy as bone graft materials for maxillofacial and orthopedic surgery.
    To achieve this objective, we manufactured calcium phosphate bone grafts with different surface designs, i.e. topographies with different surface crystal morphology (needle-shaped vs. grain-shaped) in the micron- and submicron range, and evaluated their ability to induce ectopic bone formation in a canine intramuscular pouch model. The material with the highest osteoinductive potential, attributed to its needle-shaped submicron topography, was selected for further evaluation in pre-clinical models of orthopedic surgery (i.e. spinal fusion) and maxillofacial surgery (i.e. maxillary sinus floor augmentation). In these studies, the material was compared to the gold standard autograft and/or other synthetic bone graft substitute materials. In addition to these pre-clinical studies, the bone graft material with needle-shaped topography was evaluated in a retrospective cohort study of interbody spinal fusion and a preliminary prospective, randomized controlled trial (RCT) of maxillary sinus floor augmentation. Furthermore, to gain insight into the biological effects of calcium phosphate topography, polarization of primary human macrophages in response to calcium phosphates with submicron needle-shaped topography and conventional topography was assessed in vitro, which included an evaluation of downstream regenerative effects of macrophages on osteogenesis and angiogenesis. These findings were placed in perspective of the available literature, in a review of M2 macrophage upregulation by biomaterials with specific structural and topographical features.
    Original languageEnglish
    Awarding Institution
    • University Medical Center (UMC) Utrecht
    Supervisors/Advisors
    • Rosenberg, Toine, Primary supervisor
    • de Bruijn, J.D., Supervisor, External person
    • Gawlitta, Debby, Co-supervisor
    • de Groot, F.., Co-supervisor, External person
    Award date6 Jul 2022
    Place of PublicationUtrecht
    Publisher
    Print ISBNs9789464238815
    DOIs
    Publication statusPublished - 6 Jul 2022

    Keywords

    • calcium phosphates
    • biomaterials
    • bone graft
    • surface topogrpahy
    • bone regeneration
    • immune response
    • spinal fusion

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