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  • 1.
    Schienle, Stefanie
    et al.
    Albert Ludwigs University, Germany.
    Al-Ahmad, Ali
    Albert Ludwigs University, Germany.
    Kohal, Ralf Joachim
    University of Freiburg, Germany.
    Bernsmann, Falk
    NTTF Coatings GmbH, Germany.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Montanaro, Laura
    Polytechnic University of Turin, Italy.
    Palmero, Paola
    Polytechnic University of Turin, Italy.
    Fürderer, Tobias
    DOCERAM Medical Ceramics GmbH, Germany.
    Chevalier, Jérôme
    University of Lyon, France.
    Hellwig, Elmar
    Albert Ludwigs University, Germany.
    Karygianni, Lamprini
    Albert Ludwigs University, Germany.
    Microbial adhesion on novel yttria-stabilized tetragonal zirconia (Y-TZP) implant surfaces with nitrogen-doped hydrogenated amorphous carbon (a-C:H:N) coatings2016In: Clinical Oral Investigations, ISSN 1432-6981, E-ISSN 1436-3771, Vol. 20, no 7, p. 1719-1732Article in journal (Refereed)
    Abstract [en]

    OBJECTIVES:

    Biomaterial surfaces are at high risk for initial microbial colonization, persistence, and concomitant infection. The rationale of this study was to assess the initial adhesion on novel implant surfaces of Enterococcus faecalis, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Candida albicans upon incubation.

    MATERIALS AND METHODS:

    The tested samples were 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) samples with nitrogen-doped hydrogenated amorphous carbon (a-C:H:N) coating (A) and 3Y-TZP samples coated with ceria-stabilized zirconia-based (Ce-TZP) composite and a-C:H:N (B). Uncoated 3Y-TZP samples (C) and bovine enamel slabs (BES) served as controls. Once the surface was characterized, the adherent microorganisms were quantified by estimating the colony-forming units (CFUs). Microbial vitality was assessed by live/dead staining, and microbial-biomaterial surface topography was visualized by scanning electron microscopy (SEM).

    RESULTS:

    Overall, A and B presented the lowest CFU values for all microorganisms, while C sheltered significantly less E. faecalis, P. aeruginosa, and C. albicans than BES. Compared to the controls, B demonstrated the lowest vitality values for E. coli (54.12 %) and C. albicans (67.99 %). Interestingly, A (29.24 %) exhibited higher eradication rates for S. aureus than B (13.95 %).

    CONCLUSIONS:

    Within the limitations of this study, a-C:H:N-coated 3Y-TZP surfaces tended to harbor less initially adherent microorganisms and selectively interfered with their vitality.

    CLINICAL RELEVANCE:

    This could enable further investigation of the new multi-functional zirconia surfaces to confirm their favorable antimicrobial properties in vivo.

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