BIOMECHANICS PERFECTION: FROM ROOT TO TOTAL ARCH MOVEMENT - Frankfurt

Prof. Kee-Joon LEE

Prof. Kee-Joon LEE

• President of WIOA
• Professor, Department of Orthodontics, Yonsei University, Korea
• Visiting scholar, Dept of Biochemistry, University of Pennsylvania (2002~2004)
• Adjunct professor, Department of Orthodontics, University of Pennsylvania(2010~2011, 2016~2019), Temple University(2010~2011)
• Visiting Scholar, the Children’s Hospital of Philadelphia (2010~2011)
• The Inventor of MARPE skeletal anchorage concept in 2009

COURSE OUTLINE

Orthodontists analyze the irregularity of dentition, space deficiency and denture alignment pattern as well as the skeletal pattern in order to prescribe proper force system represented by force/moment and their combination. However in reality majority of the orthodontists are using single continuous arch wire from the beginning to the end of treatment.

Orthodontics brackets and archwires are basic tools mediating force systems for tooth movement. It is well known that an archwire inserted between adjacent teeth would create various geometries leading to combinations of vertical forces and moments. While indirect bonding of the brackets is proposed for precise alignment, an ‘ideal’ setup model and following indirect bonding procedure do not provide the key information on the force system they would produce. Reduced predictability of the so–called ‘idealized’ setup and indirect bonding is deeply associated with the nature of the shape-driven appliance. Hence understanding the geometry is crucial to anticipate and interpret unwanted tooth movement.

In this presentation a guideline for preliminary segmental movement for minor tooth movement will be proposed from a clinical perspective. Moreover, some of the remedies to overcome the inherent biomechanical limitation of conventional brackets will be suggested in the following aspects.

1. Understanding the bracket geometries
2. Single tooth movement for impacted tooth
3. Reciprocal symmetric or asymmetric molar correction using precision lingual arch
4. Arbitrary root movement for effective space closure
5. Incisor torque control for effective finishing
6. Force-driven single wire technique for transverse/vertical correction