Dr. Kee-Joon Lee is professor and chairman of the Department of Orthodontics, Yonsei University College of Dentistry, Korea. He received DDS and PhD degree from Graduate school, College of Dentistry, Yonsei University. He completed the orthodontics specialty training in Yonsei University. He was a visiting scholar at the Department of Biochemistry, University of Pennsylvania School of Dental Medicine in 2002-2004 and at the Division of Plastic Surgery, the Children’s Hospital of Philadelphia in 2010-2011. He is currently an adjunct professor at the Department of Orthodontics, University of Pennsylvania. He is one of the founding members of the Korean Association of Lingual Orthodontists. He has contributed many book chapters on biomechanics of miniscrew-driven orthodontics, non-extraction treatment in adults, up-to-date lingual orthodontic mechanics and surgery-first approached using TADs. He is the first who demonstrated the miniscrew-assisted rapid palatal expander (MARPE) for adults in AJO-DO and has published many articles regarding the treatment of non-eruption, and total arch movement for hyperdivergent face in orthodontic journals including two cover issues in AJO-DO. His fields in research include clinical biomechanics regarding TADs application and the suture and bone responses to orthodontic stimulus. He has served as a reviewer in major orthodontic journals, including AJO-DO, Angle Orthodontists and European Journal of Orthodontics. He has been invited to numerous international orthodontic conferences around the world.
The ‘Paradox’ of Lip Protrusion Based on Soft Tissue Paradigm & 4D Total Arch Intrusion
Vertical growth or jaw rotation, in addition to the anteroposterior jaw relation, is a major factor which results in various lateral profiles. While a hyperdivergent face tends to cause lip protrusion and convex profile due to the relativity of the jaw relation, the vertical control has been considered highly challenging due to its genetic nature. A simultaneous displacement of the whole arch, named as total arch intrusion using miniscrews may be suggested as an alternative. Its feasibility, treatment outcome and the validity will be extensively discussed in the following aspects.
1) Diagnosis and etiology
Some soft tissue phenotypes such as lip incompetency and mentalis hyperactivity have been a significant contributor for facial aberrancy. Our recent study surprisingly revealed no significant relationship between vertical hard and soft tissue phenotypes. Taken together, it is reasonable to recognize the vertical facial morphology based on soft tissue phenotypes.
2) Biomechanics of labial/lingual total arch intrusion
Considering the strong genetic nature of the circummaxillary sutures, it is reasonable to conduct major dentoalveolar intrusion rather than suppression of sutural growth. The total arch intrusion in both labial and lingual orthodontics will be demonstrated. Depending on the time point when the total arch intrusion was performed, the clinical outcome may vary. Moreover, clinical effects of four-dimensional total arch intrusion will be demonstrated.