The 53rd Annual Scientific Congress of the Korean Association of Orthodontists PASSION FOR A LONG JOURNEY :
Nature vs Nurture

November 5(Thu) - 6(Fri), 2020
Precongress: November 1(Sun) / VOD: November 7(Sat) - 8(Sun)


TADs in orthodontics: decision-making factors for extraction or non-extraction
Dr. Jang Yeol Lee
  • Dr. Lee is the director of the Smileagain orthodontic center in Seoul, Korea. He received his dental and orthodontic education at Yonsei University, Seoul, Korea and completed his master and Ph. D degrees in the same school. Dr. Lee is a visiting scholar in the department of orthodontics, school of dentistry at the University of North Carolina and UCLA, USA. He is also a Clinical Professor in Department of Orthodontics, Yonsei University and Samsung Medical Center, Sungkunkwan University in Seoul, Korea. Dr Lee was the former Secretary General of World Implant Orthodontic Association.
  • Director, Smileagain Orthodontic Center, Seoul, Korea
  • Clinical Professor, Dept. of Orthodontics, Yonsei University, Seoul, Korea
  • Clinical Professor, Dept. of Orthodontics, Samsung Medical Center, Seoul, Korea
  • Visiting Professor, Dept. of Orthodontics, University of California, Los Angeles, USA
  • Visiting Scholar, Dept. of Orthodontics, University of North Carolina at Chapel Hill, USA
  • Associate Fellow, Dept. of Orthodontics, Warwick University, UK
  • Advisory Board Member, World Implant Orthodontic Association
  • Rm 204, Seocho-daero 397, Seocho-dong, Seocho-gu, Seoul, Korea 06616
  • +82-2-566-2833, +82-2-566-2815(F)

It has been over 20 years since we started using skeletal anchorage in the orthodontic field. In order to solve problems such as crowding and lip protrusion, which are one of main complaints in Korean orthodontic patients, we have been using solutions through extraction, which is the same now. However, since the use of skeletal anchors, the proportion of extraction patients has been decreasing, which is beneficial and encouraging for both patients and orthodontists.

In the past, what were the indicators of diagnosis that determined extraction and non-extraction in the diagnosis of correction? Above all, the absolute amount of crowding, the horizontal position of the anterior teeth, and the aesthetic position of the lips would have been important factors. Depending on the amount of space needed to solve the crowding and the amount of posterior movement of the anterior teeth have been key factors for deciding extractions. Although the above factors are still important at the present time with skeletal anchorage, the criteria for applying these indicators have changed somewhat. That is, the available space after premolar extraction can be different with skeletal anchorage and it is possible to create a new available space even in the case of non-extraction. Therefore, it is now possible to make a more complete treatment plan by considering various other factors besides the usual indicators of crowding and lip position.

In this presentation, it will be considered how the criteria for diagnosis that can determine extraction and non-extraction should be changed and applied at the present time using the skeletal anchorage. Also, the physiological aspects of guidelines that can address the aesthetic needs of patients will be discussed.