Volume 31, Issue 11 pp. 1078-1086
ORIGINAL RESEARCH

Biofilm formation on metal alloys, zirconia and polyetherketoneketone as implant materials in vivo

Barbara Zeller

Barbara Zeller

Department of Reconstructive Dentistry, University Center for Dental Medicine, University of Basel, Basel, Switzerland

Contribution: Data curation (equal), ​Investigation (equal)

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Simone Stöckli

Simone Stöckli

Department of Oral Health and Medicine, University Center for Dental Medicine, University of Basel, Basel, Switzerland

Contribution: Data curation (equal), ​Investigation (equal)

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Lucia K. Zaugg

Lucia K. Zaugg

Department of Reconstructive Dentistry, University Center for Dental Medicine, University of Basel, Basel, Switzerland

Contribution: Methodology (equal), Writing - original draft (equal)

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Monika Astasov-Frauenhoffer

Monika Astasov-Frauenhoffer

Department Research, University Center for Dental Medicine, University of Basel, Basel, Switzerland

Contribution: ​Investigation (supporting), Methodology (supporting)

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Irmgard Hauser-Gerspach

Irmgard Hauser-Gerspach

Department Research, University Center for Dental Medicine, University of Basel, Basel, Switzerland

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Tuomas Waltimo

Tuomas Waltimo

Department of Oral Health and Medicine, University Center for Dental Medicine, University of Basel, Basel, Switzerland

Contribution: Conceptualization (equal), Project administration (equal), Supervision (lead)

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Nicola U. Zitzmann

Corresponding Author

Nicola U. Zitzmann

Department of Reconstructive Dentistry, University Center for Dental Medicine, University of Basel, Basel, Switzerland

Correspondence

Nicola U. Zitzmann, Department of Reconstructive Dentistry, University Center for Dental Medicine, University of Basel, Mattentrasse 40, CH-4058 Basel, Switzerland.

Email: [email protected]

Contribution: Conceptualization, Project administration, Resources (equal), Supervision (lead), Writing - review & editing (equal)

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First published: 01 September 2020
Citations: 22

Barbara Zeller and Simone Stöckli should be considered joint first authorship.

Tuomas Waltimo and Nicola U. Zitzmann should be considered joint senior author.

[Correction added on 06 October 2020 after first online publication: The electron microscopy image for PEKK in Figure 4 has been corrected in this current version.]

Abstract

Objectives

This study investigated biofilm formation on discs of metal alloys, zirconia and polyetherketoneketone in vivo.

Material and Methods

Sixteen healthy volunteers conducted two runs of 24 hr each wearing an intraoral splint with 15 discs representing five different materials (gold-based [EL] and silver-based [PA] noble metal alloys; zirconia [ZR]; polyetherketoneketone [PEKK]; titanium zirconium alloy [TiZr]). Safranin staining assays and colony-forming unit (CFU) counts were conducted. Linear mixed-effects models were used to compare materials, and geometric mean ratios with 95% confidence interval were calculated with the level of significance set at α = 0.05.

Results

Less biofilm mass and lower CFU counts were found on PA and EL, while ZR and PEKK developed similar levels as the reference material TiZr alloy. Compared with PA, biofilm mass was 1.5 times higher for EL (p = .004), 1.7 times higher for PEKK (p < .001), 2.2 times higher for TiZr (p < .001) and 2.4 times higher for ZR (p < .001). The culturing method confirmed these results for EL and PA with lower CFU compared to TiZr. The biomass staining technique and cell culturing correlated for EL and PA.

Conclusion

Silver-based noble alloy and gold-based high noble alloy demonstrated the least biofilm formation indicating a potential clinical use as material for implant components in the transmucosal compartment. Zirconia and Polyetherketoneketone revealed similar results as the reference material titanium zirconium alloy used in commercially available titanium dental implant.

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