Ikumi N, Tsutsumi S. Assessment of correlation between computerized tomography values of the bone and cutting torque values at implant placement. A clinical study. Int J Oral Maxillofac Implants, 20, 253- 260, 2005
Ikumi N, Suzawa T, Yoshimura K, Kamijo R. Bone response to static compressive stress at bone-implant interface: A pilot study of critical static compressive stress, Int J Oral Maxillofac Implants, 30,827-833,2015.
Hyon SH, Matsumura K, Ikumi N, Tsutumi S, Regeneration of the periodontal ligament onto the titanium implant surface, Journal of Dental Research 82, 419-419, 2003.
Matsumura K, Tsutsumi S, Ikumi N, Nakajima N, Peng, SH Hyon C, Trial toward the regeneration of periodontal tissues around titanium implant, Journal of Dental Research 82, B62-B62, 2003.
Matsumura K, Tsutsumi S, Ikumi N, Nakajima N, Peng, SH Hyon C, Biological response of surface-modified titanium,Journal of Dental Research 82, B62-B62, 2003.
Sato Y , Ikumi N, et al., A preliminary report on dental implant condition among dependent elderly based on the survey among Japanese dental practitioners, International Journal of Implant Dentistry （2018） 4:14,
Sato Y, Ikumi N, Koyama S, Watanabe F, et al, Dental implant care and trouble among dependent patients based on the questionnaire survey among Japanese dental practitioners, BMC Oral Health, (2020) 20:335.
Ikumi N. Assessment of alveolar bone at the site of implantation of maxillary premolar and molar. At 86th annual meeting of American Academy of Periodontology （AAP） （USA）, 2000.
Ikumi N. Interpretation of CT-based anatomy and optimization of treatment planning, At Continuing Education1 （CE1） symposium in 96th annual meeting of American Academy of Periodontology （AAP） （USA）, 2010.
Ikumi N, Formulation and Optimization of Implant Treatment Design – Achieving Good Aesthetics and Function Based on the Optimal Design Concept, At 30th Congress of German Association of Oral Implantology （DGI）, Hamburg, Germany, 2016.