38-Year History
A record of practice continued in one place since 1988.

- 1982
Dr. Key graduates from Yonsei University College of Dentistry
- 1983
First two-jaw (bimaxillary) surgery in Korea (August, Oral & Maxillofacial Surgery, Yonsei University)
- 1985
Completes oral & maxillofacial surgery residency at Yonsei · Full-time professor at Soonchunhyang University College of Medicine (until 1987)
- 1988
Greenmall Dental Clinic opens · First successful endosseous implant procedure in Korea
- 2000
First general-anesthesia operating room among private dental clinics in Korea; orthognathic surgery begins
- 2001
EBS “Health Clinic” lecture “The Truth and Myths of Implants” · Implant live surgery (2001–2003)
- 2005
Publishes “Overcoming Implant Failures” (Uichihaksa) · Speaker, 1st CAMLOG Symposium · Implant lectures at SIDEX (until 2010)
- 2006
Ph.D., Inha University Graduate School
- 2008
CAMLOG Foundation (Germany) research support — five-years retrospective study of CAMLOG ROOT-LINE implants (Ref. CF40808)
- 2009
Speaker, 1st Korea CAMLOG Congress (COEX) · President, oral & maxillofacial surgery practitioners’ meeting
- 2010
Founded the Greenmall implant surgical training course
- 2011
Guest lecture & interview on EBS “Myeongsa Chodaeseok”
- 2019
Publishes “Essentials of Clinical Dental Implantology” (Chinese edition)
- 2025
Publishes “Reconstruction Implant” (English) and a reconstructive implantology case collection
- 2026
PDRN skin booster treatment begins
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