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

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

The 8th Korea-Japan Joint Symposium - Long Term Stability

The stability of open bite treated by anterior teeth extrusion, molar intrusion and surgery
Dr. Yasushi Nishii
  • Personal Information
  • Affiliation: Tokyo Dental College department of Orthodontics
  • Address: 2-9-18 Kanda Misaki-cho Chiyoda-ku, Tokyo Japan
  • E-mail: nishii@tdc.ac.jp
  • Education
  • 1994 Resident course in Tokyo Dental College Department of Orthodontics
  • 1986 Tokyo Dental College
  • Degrees
  • 2001 Doctor of Dentistry in Tokyo Dental College
  • 1986 Degree of Dental Surgery in Tokyo Dental College
  • Work Experience
  • 2019 Professor and Chair in Tokyo Dental College Department of Orthodontics
  • 2018 Associate Professor in Tokyo Dental College Department of Orthodontics
  • 2014 Senior Assistant Professor in Tokyo Dental College Department of Orthodontics
  • 2007-2008 Visiting Scholar in Dental School of University of Southern California
  • 1998 Assistant Professor in Tokyo Dental College Department of Orthodontics
  • 1986-1994 Private dental office
  • Awards/Honors
  • Outstanding poster award of 26th Congress of the Japanese Society for Jaw Deformities
  • Outstanding poster award of The 55th Congress of the Korean Association of Maxillofacial Plastic and Reconstructive Surgeons

Treatment strategy has drastically changed in orthodontics after the appearance of TAD. Molar intrusion, one of the most difficult tooth movement, has become possible by TAD. The only treatment alternative to open bite was extrusion of anterior teeth before TAD; now, we have obtained treatment strategy of not only anterior teeth extrusion but also molar intrusion with TAD. Also, surgical orthodontics, as usual, is applied to severe open bite as another treatment method.
The diagnosis has become a more important issue in choosing treatment strategies such as anterior teeth extrusion, molar intrusion and surgery. The stability of retention in open bite should be affected by these treatment alterations. Molar intrusion, that is a relatively new treatment method, has not sufficiently demonstrated the retention stability.
We evaluated relation between facial morphology in vertical component and choice of treatment strategy, anterior teeth extrusion, molar intrusion, and surgery with the retrospect study, and also compared the relapse among three treatment strategies.
I would like to share our data information and my treatment opinion with KAO members. It would be great if my lecture could contribute to the daily clinical practice of KAO members even just a little.