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William Papaioannou

Associate Professor

Phone: 210-746-1210
Email: vpapaio[at]otenet[dot]gr

Mailing Address:
2 Thivon Str, 115 27, Goudi, Athens, Greece

Ελληνική Έκδοση English Version

Education / Qualifications

  • 1992 Doctor of Dental Surgery (DDS).  Dental Section of the School of Health Sciences in the Aristotle University of Thessaloniki, Greece.
  • 1994 "Master of Dental Sciences” (MScD) in periodontology from the Catholic University Leuven, Belgium.
  • 1998 "Diploma of Specialization in Periodontology" (Gediplomeerde in de Gespecialiseerde Studies van Parodontologie) from the Catholic University of Leuven, Belgium.
  • 1998 "Doctor in the Medical Sciences" (PhD) from the Catholic University of Leuven, Belgium.

Academic and professional positions held

  • 2005 Lecturer, Dept. of Preventive and Community Dentistry, National and Kapodistrian University of Athens.
  • 2009 Assistant Professor Dept. of Preventive and Community Dentistry, National and Kapodistrian University of Athens.
  • 2018 Associate Professor Dept. of Preventive and Community Dentistry, National and Kapodistrian University of Athens.

Administrative and organizational experience

  • Member of the Board of the Continental European Division of the International Association for Dental Research (CED-IADR) (since 2016).
  • Representative in the General Assembly of the NKUA School of Dentistry (Academic years 2007-2010, 2011-2015).
  • Member of the Self – Assessment Committee (SAC) of the NKUA
  • School of Dentistry (2008-2016).
  • Organizing Committee of the 28th and 32nd PanHellenic Dental Congresses.
  • Member of the Curriculum Committee (2009 – 2010).
  • Member of the Board of the Hellenic Society of Periodontology (since
  • 2015). Secretary General since 2017.
  • Ambassador of Greece for the European Federation’s EuroPerio 9 Conference committee. Amsterdam: June 20-23, 2018.
  • Head of the Section of Community Dentistry, NKUA School of Dentistry (2017-2019).
  • Ad hoc reviewer in peer reviewed scientific journals
    • American Journal of Orthodontics & Dentofacial Orthopedics
    • Angle Orthodontists
    • Journal of Oral Rehabilitation
    • Archives of Oral Biology
    • Journal of Dentistry
    • International Journal of Paediatric Dentistry
    • Journal of Dental Education
    • Oral Diseases
    • Orthodontics and Craniofacial Research
    • European Archives of Paediatric Dentistry
    • European Journal of Dental Education
    • PLOS ONE


  • Continental European Division of the International Association for Dental Research (CED-IADR)
  • American Academy of Periodontology (AAP)
  • European Association for Osseointegration (EAO).
  • Foundation for Oral Rehabilitation (FOR)
  • Hellenic Society of Odontostomatological Research
  • Hellenic Society of Periodontology  

Grants and Awards

  • NKUA research program “Kapodistria”, twice.
  • The Procter & Gamble “Koulourides Research Grant” was awarded in 2014.
  • 2018 International Align Research Award

Selected publications in scientific journals

  • Papaioannou W, Quirynen M, Nys M, van Steenberghe D. The effect of periodontal parameters on the subgingival microbiota around implants. Clinical Oral Implant Research 1995, 6: 197-204.
  • Bollen CML, Vandekerckhove BNA, Papaioannou W, Van Eldere J, Quirynen M. Full- versus partial-mouth disinfection in the treatment of periodontal infections. A pilot study: Long-term microbiological observations. Journal of Clinical Periodontology 1996, 23: 960-970.
  • Papaioannou W, Quirynen M, van Steenberghe D. The influence of periodontitis on the subgingival flora around implants in partially edentulous patients. Clinical Oral Implant Research 1996, 7: 405-409.
  • Papaioannou W, van Steenberghe D, Cassiman J-J, Van Eldere J, Quirynen M. Comparison of fluorescence microscopy and culture assays to quantitate adhesion of Porphyromonas gingivalis to mono- and multi-layered pocket epithelium cultures. Journal of Periodontology 1999, 70: 618-625.
  • Quirynen M, Papaioannou W, Van Steenbergen TJM, Dierickx K, Cassiman JJ, van Steenberghe D .Adhesion of Porphyromonas gingivalis strains to cultured epithelial cells from patients with a history of chronic adult periodontitis or from patients less susceptible to periodontitis. Journal of Periodontology 2001, 72: 626-633.
  • Efstratiou M, Papaioannou W, Nakou M, Ktenas E, Vrotsos IA, Panis V. Contamination of a toothbrush with antibacterial properties by oral microorganisms. Journal of Dentistry 2007, 35: 331-337.
  • Papaioannou W, Gizani S, Nassika M, Kontou E, Nakou M. Adhesion of Streptococcus mutans to different types of brackets. Angle Orthodontists 2007, 77: 1090-1095.
  • Perdikogianni H, Papaioannou W, Nakou M, Oulis K, Papagiannoulis L. Periodontal and microbiological parameter in children and adolescents with cleft lip and/or palate. International Journal of Paediatric Dentistry 2009; 19: 455–467.
  • Papaioannou W, Gizani S, Haffajee AD, Quirynen M, Mamai-Homata E, Papagiannoulis L. The microbiota on different oral surfaces in healthy children. Oral Microbiology Immunology 2009; 24: 183-189
  • Gizani S, Papaioannou W, Haffajee AD, Kavvadia K, Quirynen M, Papagiannoulis L. Distribution of selected cariogenic bacteria in 5 different intra-oral habitats in young children. International Journal Paediatric Dentistry 2009; 19: 193-200.
  • Pandis N, Papaioannou W, Kontou E, Nakou M, Makou M, Eliades T. Salivary Streptococcus mutans levels in patients with conventional and self-ligating brackets. European Journal of Orthodontics 2010; 32: 94-99
  • Papaioannou W, Oulis CJ, Latsou D, Yfantopoulos J. Oral health related quality of life of Greek adolescents: a cross-sectional study. European Archives of Paediatric Dentistry 2011; 12: 146-150
  • Koletsi-Kounari H, Papaioannou W, Stefaniotis T. Greece's high dentist to population ratio: comparisons, causes, and effects. Journal Dental Education 2011; 75: 1507-1515.
  • Papaioannou W, Panagopoulos A, Koletsi-Kounari H, Kontou E, Makou M.  Adhesion of Porphyromonas gingivalis and biofilm formation on different types of orthodontic brackets. International Journal of Dentistry 2012; 2012: 471380. Epub 2012 Jan 18.
  • Papaioannou W, Oulis CJ, Yfantopoulos J.  The oral health related quality of life in different groups of senior citizens as measured by the OHIP-14 questionnaire. Oral Biology and Dentistry 2015; 3: 1-7.
  • Madianos P, Papaioannou W, Herrera D, Sanz M, et al. EFP Delphi study on the tendencies in Periodontology and Periodontics in Europe for the year 2025. Journal of Clinical Periodontology 2016; 43: 472-481.
  • Mantonanaki M, Hatzichristos T, Koletsi-Kounari H, Papaioannou W. Socio-Demographic and Area-Related Factors Affecting the Prevalence of Caries among Preschool Children in Greece. Community Dental Health 2017; 34: 112-117.
  • Damaskinos P, Koletsi-Kounari H, Mamai-Homata E, Margaritis V, Papaioannou W. Tooth Loss, Cognitive Ability and Socio-Economic Indicators in Older Adults Visiting Day Centers, in Athens and Piraeus, Greece. EC Dental Science 17.6 (2018): 921-931

Areas of scientific interest

Oral microbiology focusing on a) the pathogenesis and microbiology of periodontal disease and caries, b) the microbiota of young individuals and changes according to age as well as during orthodontic therapy, and c) the adhesion of select microorganisms to orthodontic materials. Other interests include oral halitosis and oral health related quality of life.

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