Prof. Dr. Curd Bollen

DDS, PhD, MSc, PGCert3

Prof. Dr. Curd Bollen obtained his dental degree, Master’s degree in  eriodontology and Implantology, and PhD at the Catholic University of Leuven (Belgium). He subsequently completed three postgraduate certificates at internationally renowned institutions: the University of the Pacific (USA), Harvard University (USA), and Cardiff University – Bond Solon (UK).

He currently serves part-time as Professor of Periodontology at Yerevan State Medical University (Armenia) and as Senior Lecturer at the Tipton Training Academy (United Kingdom).

Prof. Bollen is a Specialist Periodontist and Implantologist, licensed in both Belgium and the United Kingdom.

Since 2026, he has also been officially recognised as an Expert Witness in the UK., where I acts as legal expert in the fields of periodontology and implant dentistry. He is member of the British Medical Experts and the Expert Witness Institute.

He has authored or co-authored more than 70 scientific publications in international peer-reviewed dental journals and over 25 publications in national journals. He is Editor-in-Chief of the Journal of Dental Health, Oral Disorders & Therapy, the Journal of Dental Reports, and the Journal of Clinical Practice & Medical Case Reports.

Internationally recognised as a speaker and researcher, Prof. Bollen lectures extensively on ceramic dental implants, ultra-short dental implants, and concentrated growth factors and the impact of periodontitis on systemic health. He is ambassador fort he CleanImplant Foundation.

• Implant Dentistry
• Regenerative Oral Surgery
• Periodontology

• Quirynen M., van der Mei H.C., Bollen C.M., Schotte A., Marechal M., Doornbusch G.I., Naert I., Busscher H.J., van Steenberghe D., In vivo study of implant surface roughness influence on supra- and subgingival plaque microbiology, Journal of Dental Research, 72: 1304–1309, 1993.
• Quirynen M., van der Mei H.C., Bollen C.M., Van den Bossche L.H., Doornbusch G.I., van Steenberghe D., Busscher H.J., Influence of surface-free energy on supra- and subgingival plaque microbiology: In vivo study on implants, Journal of Periodontology, 65: 162–167, 1994.
• Quirynen M., Bollen C.M., Willems G., van Steenberghe D., Comparison of surface characteristics of six commercially pure titanium abutments, International Journal of Oral & Maxillofacial Implants, 9: 71–76, 1994.
• Quirynen M., Bollen C.M., Papaioannou W., Chairside microbiological tests in periodontics, Revue Belge de Médecine Dentaire, 49: 26–43, 1994. [French]
• Bollen C.M., Quirynen M., Specimen collection in dental plaque and oral microbiology, Revue Belge de Médecine Dentaire, 49: 44–51, 1994. [French]
• Quirynen M., Bollen C.M., Eyssen H., van Steenberghe D., Microbial penetration along implant components of the Brånemark system: An in vitro study, Clinical Oral Implants Research, 5: 239–244, 1994.
• Quirynen M., van der Mei H.C., Bollen C.M.L., Geertsma-Doornbusch G.I., Busscher H.J., van Steenberghe D., Clinical relevance of surface free energy and roughness on plaque formation, Colloids and Surfaces B: Biointerfaces, 2: 25–31, 1994.
• Quirynen M., Bollen C.M., Vandekerckhove B.N., Dekeyser C., Papaioannou W., Eyssen H., Full- vs. partial-mouth disinfection in periodontal infections: Short-term clinical and microbiological observations, Journal of Dental Research, 74: 1459–1467, 1995.
• Quirynen M., Bollen C.M., Influence of surface roughness and surface-free energy on supra- and subgingival plaque formation in man: Literature review, Journal of Clinical Periodontology, 22: 1–14, 1995.
• Vandekerckhove B.N., Bollen C.M., Dekeyser C., Darius P., Quirynen M., Full- vs. partial-mouth disinfection in periodontal infections: Long-term clinical pilot study, Journal of Periodontology, 67: 1251–1259, 1996.
• Quirynen M., Bollen C.M., Papaioannou W., Van Eldere J., van Steenberghe D., Influence of titanium abutment surface roughness on plaque accumulation and gingivitis: Short-term observations, International Journal of Oral & Maxillofacial Implants, 11: 169–178, 1996.
• Quirynen M., Bollen C.M., Papaioannou W., Van Eldere J., van Steenberghe D., Influence of titanium abutment surface roughness on plaque accumulation and gingivitis: Short-term observations, Quintessence Dental Implantology, 3: 681–691, 1996. [Japanese]
• Papaioannou W., Bollen C.M., Van Eldere J., Quirynen M., Adherence of periodontopathogens to periodontal probes: A possible factor in intra-oral transmission, Journal of Periodontology, 67: 1164–1169, 1996.
• Bollen C.M., Vandekerckhove B.N., Papaioannou W., Van Eldere J., Quirynen M., Full- vs. partial-mouth disinfection in periodontal infections: Long-term microbiological pilot study, Journal of Clinical Periodontology, 23: 960–970, 1996.
• Bollen C.M., Quirynen M., Microbiological response to mechanical treatment with adjunctive therapy: Literature review, Journal of Periodontology, 67: 1143–1158, 1996.
• Bollen C.M., Papaioannou W., Van Eldere J., Schepers E., Quirynen M., van Steenberghe D., Influence of abutment surface roughness on plaque accumulation and peri-implant mucositis, Clinical Oral Implants Research, 7: 201–211, 1996.
• van Steenberghe D., Yoshida K., Papaioannou W., Bollen C.M., Reybrouck G., Quirynen M., Complete nose coverage to prevent airborne contamination via nostrils is unnecessary, Clinical Oral Implants Research, 8: 512–516, 1997.
• Papaioannou W., Bollen C.M., Quirynen M., One-stage full-mouth disinfection to overcome intra-oral transmission of periodontopathogens, Anaerobe, 3: 163–168, 1997.
• Bollen C.M., Lambrechts P., Quirynen M., Comparison of surface roughness of oral hard materials to threshold roughness for plaque retention: Literature review, Dental Materials, 13: 258–269, 1997.
• Bollen C.M., Mongardini C., Papaioannou W., Van Steenberghe D., Quirynen M., Effect of one-stage full-mouth disinfection on intra-oral niches: Clinical and microbiological observations, Journal of Clinical Periodontology, 25: 56–66, 1998.
• Quirynen M., Van Eldere J., Pauwels M., Bollen C.M., van Steenberghe D., In vitro volatile sulfur compound production of oral bacteria in different culture media, Quintessence International, 30: 351–356, 1999.
• Quirynen M., Mongardini C., Pauwels M., Bollen C.M., Van Eldere J., van Steenberghe D., Full- vs. partial-mouth disinfection in chronic adult or generalized early-onset periodontitis: Long-term microbial impact, Journal of Periodontology, 70: 646–656, 1999.
• Delanghe G., Ghyselen J., Bollen C., van Steenberghe D., Vandekerckhove B.N., Feenstra L., Inventory of patient responses to treatment at a multidisciplinary breath odor clinic, Quintessence International, 30: 307–310, 1999.
• Delanghe G., Bollen C., Desloovere C., Halitosis – foetor ex ore, Laryngorhinootologie, 78: 521–524, 1999. [German]
• Bollen C.M., Rompen E.H., Demanez J.P., Halitosis: A multidisciplinary problem, Revue Médicale de Liège, 54: 32–36, 1999. [French]
• Bollen C., Sampling of plaque specimens in oral microbiology, Revue Belge de Médecine Dentaire, 54: 190–194, 1999. [French]
• Bollen C.M.L., Jepsen S., Halitosis: A multi-disciplinary problem, Prophylaxis Dialogue, 18–21, 2009.
• Bollen C.M.L., Jepsen S., Halitosis: Ein multi-disziplinäres Problem, Prophylaxe Dialog, 18–21, 2009. [German]
• Bollen C.M.L., Beikler T., Halitosis: The multi-disciplinary approach, International Journal of Oral Science, 4: 55–63, 2012.
• Bollen C.M.L., Peri-implantitis: A new disease!, Journal of Dental Health Oral Disorders Therapy, 1(3): 00018, 2014.
• Bollen C.M.L., How to handle halitosis examinations?, EC Dental Science, 2(2): 254–259, 2015.
• Bollen C., Save lives: Do an HPV-detection test!, Journal of Dental Health Oral Disorders Therapy, 4(1): 00097, 2016.
• Aydin M., Bollen C.M., Özen M.E., Diagnostic value of halitosis examination methods, Compendium of Continuing Education in Dentistry, 37: 174–178, 2016.
• Aydin M., Bollen C.M.L., Özen M.E., A halitosis vizsgálati módszereinek diagnosztikai értékelése, Magyar Fogorvos, 4: 184–191, 2016. [Hungarian]
• Bollen C.M.L., White is the new grey!, Oral Health and Dentistry, 1: 1–3, 2016.
• Bollen C.M.L., White or grey? Ceramic or metal?, EC Dental Science, 28–29, 2016.
• Bollen C., Myths about halitosis, Journal of Dental Health Oral Disorders Therapy, 5: 00143, 2016.
• Bollen C.M.L., Zirconia: The material of choice in implant dentistry? An update, Journal of Dental Health Oral Disorders Therapy, 2017. doi: 10.15406/jdhodt.2017.06.00219.
• Bollen C.M.L., Winkel O.H.C., Implantate und Halitosis: Gibt es einen Zusammenhang?, ZMK, 34: 762–770, 2018. [German]
• Bollen C., Almasri M., Zirconia: The material of choice in implant dentistry?, Implant Dentistry Today, 3: 8–14, 2020.
• Bollen C., Almasri M., Zirconium-dioxide as preferred material for dental implants: A narrative review, Part I, Ceramic Implants, 4: 20–22, 2020.
• Bollen C., Dargel I., Einzelzahnversorgung mit Keramikimplantat nach Trauma, Implantologie Journal, 7–8: 26–30, 2020. [German]
• Bollen C., Almasri M., Zirconium-dioxide as preferred material for dental implants: A narrative review, Part II, Ceramic Implants, 5: 1–5, 2020.
• Bollen C., Dargel I., Almasri M., Replacement of 2 incisors by zirconia implants: Extended case report, Journal of Dental Reports, 1: 1–8, 2020.
• Bollen C., Najimi Y., Almasri M., COVID-19 and dental implants: Impact and perspectives, Implant Dentistry Today, 1: 7–11, 2021.
• Bollen C., Dargel I., Replacement of 2 incisors by zirconia implants, Ceramic Implants, 1: 36–39, 2021.
• Bollen C., Impact of COVID-19 on implant dentistry, Journal of Dental Reports, 2(1): 1–4, 2021.
• Bollen C., Tipton T., Single tooth replacement by ceramic dental implants, Clinical Dentistry, February: 1–6, 2022.
• Bollen C., Tipton P., Working with zirconia implants requires a different approach, Journal of Dental Reports, 2: 1–9, 2021.
• Veljanovski D., Atanasovska-Stojanovska A., Pivkova-Veljanovska A., Mijiritsky E., Bollen C., Vertical soft tissue thickness and subcrestal implant placement as factors for peri-implant crestal bone, Open Access Macedonian Journal of Medical Sciences, 9: 257–263, 2021.
• Boogaard M., Bollen C., Use of a synthetic putty graft in extraction sockets with immediate implant installation – 3 cases, Journal of Dental Reports, 3: 1–9, 2022.
• Boogaard M., Bollen C., Sofortimplantate in Extraktionsalveolen mit synthetischem Kitt-Transplantat, Implantologie, 2022. [German]
• Bollen C., Tipton P., Single tooth replacement by ceramic dental implants: A case series, Ceramic Implants, 1: 18–22, 2022.
• Bollen C., Tipton P., Shortening implant times by influencing healing response: Positive effects of platelet-rich fibrin on osseointegration, Clinical Dentistry, September: 61–64, 2022.
• Dudeck D.U., Bollen C.M.L., Update Oberflächenanalysen: Steril verpackte Implantate unter der Lupe, Zahnmedizin up2date, 16: 1–14, 2022. [German]
• Boogaard M., Bollen C., Immediate implant placement, Implant Dentistry, October: 69–76, 2022.
• Hakobyan G., Seyranyan A., Yessayan L., Davit M., Bollen C., Surgical regenerative treatment with magnetic laser supportive therapy for peri-implantitis, Bulletin of Stomatology and Maxillofacial Surgery, 18: 84–93, 2022.
• Bollen C.M.L., Diederich H., Al-Masri M., Cone beam computed tomography in implant dentistry – An update, Journal of Dental Reports, 4: 1–7, 2023.
• Bollen C.M.L., Hakobyan G., S3 Guidelines on ceramic dental implants and titanium hypersensitivity: Statements and recommendations for the worldwide implant dentistry community, Bulletin of Stomatology and Maxillofacial Surgery, 19: 75–83, 2023. doi: 10.58240/1829006X-2023.19.71-75.
• Bollen C., Jörgens M., 1-piece and 2-piece ceramic dental implants, Ceramic Implants, 3: 24–29, 2023.
• Bollen C., Jörgens M., Clinical and scientific differences between 1-piece and 2-piece ceramic dental implants, EDI Journal, 3: 50–54, 2023.
• Bollen C., Jörgens M., Hakobayan G., 1-piece versus 2-piece ceramic dental implants, British Dental Journal, 236: 383–387, 2024.
• Hakobyan T., Grigoryan A., Bollen C., Hakobyan G., Immediate implant placement and immediate loading with fully digital fabricated screw-retained implant prosthesis: A controlled case series, Bulletin of Stomatology and Maxillofacial Surgery, 20(2): 117–125, 2024. doi: 10.58240/1829006X-2024.2-117.
• Bollen C., Tipton P., Kocharyan M., Hakobyan G., Impact of periodontitis on systemic health and implants, Implants, 4: 18–21, 2024.
• Bollen C., Tipton P., Kocharyan M., Hakobyan G., Impact of periodontitis on systemic health and implants, Ceramic Implants, 2: 20–23, 2024.
• Aghasyan E., Yessayan L., Ramanarayana B., Bollen C., Khachatryan H., Hakobyan G., Current concepts of non-surgical periodontal therapy in chronic periodontitis, Journal of Dental Oral Health, 5: 1–10, 2024.
• Bollen C., Tipton P., Hakobyan G., Impact of periodontitis on systemic health and implants – Part 2, Ceramic Implants, 3: 20–22, 2024.
• Bollen C., Tipton P., Hakobyan G., Impact of periodontitis on systemic health and implants – Part 2, Implants, 1: 1–4, 2025.
• Ghambaryan N., Bollen C., Harutyunyan H., Habobyan G., Effect of crown-implant ratio of short implants on peri-implant stress: Finite element analysis, International Journal of Medical Science & Dental Health, 11: 38–47, 2025.
• Margaryan V., Aghasyan E., Yessayan L., Khachatryan H., Bollen C., Hakobyan G., Adjunctive therapea – A promising method in periodontal disease treatment, Clinical Oral Investigations, 29: 78–, 2025. doi: 10.1007/s00784-025-06163-1. PMID: 39849187.
• Ghambaryan N., Bollen C., Hakobyan G., Influence of crown-implant ratio on success rates of photofunctionalized short implants: 5-year prospective study, Oral and Maxillofacial Surgery, 29(1): 100, May 2025. doi: 10.1007/s10006-025-01395-7. PMID: 40358774.
• Bollen C., Beyond the oral cavity: The systemic impact of periodontitis – A narrative review, Bulletin of Stomatology and Maxillofacial Surgery, 22(2), 2026. doi: 10.58240/1829006X-2026.22.2.

• Quirynen M., Papaioannou W., Bollen C.M.L., van Steenberghe D., Major impact factors on the composition of the microflora around osseointegrated implants: In vivo and in vitro experiments, Proceedings of the 1st World Congress of Osseointegration, Venice, Sept 29–Oct 2, 1994, pp. 133–142.
• Quirynen M., Bollen C.M.L., Eyssen H., van Steenberghe D., Microbiological aspects of the passive fit at the implant/abutment junction, in Naert I.E. (ed.), Passive Fit of Implant Supported Superstructures: Fiction or Reality?, Leuven University Press, Leuven, 1995, pp. 87–97.
• Bollen C.M.L., Full-mouth disinfection and hard surface smoothening reduce the subgingival microbial load, Universitaire Pers Leuven, Leuven, 1996.
• Vandekerckhove B., Bollen C., Tandpasta’s en mondspoelmiddelen, Universitaire Pers Leuven, Leuven, 1996.
• Quirynen M., Bollen C.M.L., Vandekerckhove B.N.A., Papaioannou W., Eyssen H., Effect of full-mouth disinfection on periodontopathic anaerobic population in the oral cavity: A pilot study, in Eley A.R., Bennett K. (eds.), Anaerobic Pathogens, Sheffield Academic Press, Sheffield, 1997, pp. 281–291.
• Bollen C.M.L., Papaioannou W., Quirynen M., Influence of surface roughness of intra-oral hard substrata on early subgingival colonisation by anaerobic bacteria: Short-term microbiological observations, in Eley A.R., Bennett K. (eds.), Anaerobic Pathogens, Sheffield Academic Press, Sheffield, 1997, pp. 309–317.
• Bollen C.M.L., Papaioannou W., Quirynen M., Contribution of intra-oral translocation of pathogenic organisms in dental plaque formation, in Busscher H.J., Evens L.V. (eds.), Oral Biofilms and Plaque Control, Harwood Academic Publishers, Amsterdam, 1998, pp. 233–243.
• Vandekerckhove B., Bollen C., Epidemiologie bij de algemene bevolking, bijzondere bevolkingsgroepen en bij een multidisciplinair halitosespreekuur, in van Steenberghe D. (ed.), Ademgeur, Prelum Uitgevers, Houten, 2009, pp. 3–10.
• Bollen C., Dargel I., Einzelzahnversorgung mit Keramikimplantat nach Trauma, in Isbaner G. (ed.), Jahrbuch Implantologie ’21, Oemus Media, 2021, pp. 102–106. [German]

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