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

Deep bite correction by incisor intrusion - "Is it stable?"
Dr. Joong-Ki Lim
  • 1993 - 2006 Post Graduated Course, Graduate School, Yonsei University (M.S.D., Ph.D.)
  • 1992 - 1995 Certificate in Orthodontics, Yonsei University Dental Hospital
  • 1992. 2 Graduate from Dental College, Yonsei University, (Diploma D.D.S.)
  • 2003 - present
    - Clinical professor of Dept. of Orthodontics, College of Dentistry, Yonsei University, Seoul, KOREA
    - Former director of Finance of KAO (Korean Association of Orthodontists)
    - Vice President of KAOF (Korean Association of Orthodontists Foundation)
    - President of KALO (Korean Association of Lingual Orthodontists) Yon orthodontic clinic, Seoul, KOREA

Deepbite can exist with various malocclusions, such as Class I, II, or III, but the severity is mostly associated with the skeletal hypodivergence typically found in Class II division 2 (Ghafari 2013). Untreated deepbite can cause increased anterior crowding, maxillary dental flaring, periodontal problems, and TMJ problems (Varlik 2013). Unlike Openbite, it has less environmental impact (i.e. airway, habit, etc…) and more genetic factors. Though deepbite treatment itself is challenging for the clinicians, it is a lot more difficult to maintain the outcome of the treatment in a stable manner.

While the patients who are still growing are treated with relative incisor intrusion and molar extrusion in general, non-growing patients receive incisor intrusion because their molar extrusions are unstable. There were debates related to incisor intrusion and molar extrusion; however, there were many reports that there was no difference in the treatment results and retentions (Dake 1989, Preston 2008). It was because neither treatment was able to have the incisor intrusion without the molar extrusion.

The introduction of mini-implant has provided a new turning point in the treatment of deepbite. This is because absolute incisor intrusion without extrusion of the posterior teeth is possible and is relatively easy and safe to use in daily practices. When mini-implant was first developed in Korea, many clinicians and researchers took an interest and have reported on incisor intrusion. Nonetheless, there have been only few studies and reports on the long-term stability.

In this presentation, we would like to examine the treatment effect and stability of incisor intrusion using mini-implant through case reviews and descriptive statistics of a pilot study. In addition, I would like to examine the variables that affect deepbite correction stability - namely interincisal angle, lower incisor inclination, lower anterior crowding, etc. - and make some clinical suggestions.