Biomechanics & Esthetics

Controlling Apical Root Position and Its Long-term Stability
Jang-Yeol Lee

Lecture Description
The aim of orthodontic treatment is to establish a harmonious occlusion of the maxillary and mandibular teeth along with the proper jaw relationship. If the sagittal position of the maxilla and mandible is severely displaced, orthognathic surgery is necessary, but if the amount of skeletal discrepancy is not large, good occlusion and facial esthetics can be achieved through orthodontic camouflage treatment. Especially, it is fortunate that this kind of camouflage treatment has been more possible and successful since we used skeletal anchorage in orthodontic field. However, it is important to form a good occlusion at the crown level, but more in-depth consideration is required on how to set the position of the root, which is an important aspect in securing long-term stability from a physiological, periodontal and biomechanical viewpoint.

Therefore, in this presentation, I will look at the considerations necessary for planning the location of the roots during orthodontic camouflage treatment according to each skeletal malocclusion and consider the problems that may arise when these parts are overlooked. In addition, I would like to discuss treatment strategies and biomechanical considerations to solve problems, look at changes in root position that can occur after long-term observation, and review how to control factors that affect long-term treatment stability.

In addition, through this process, I will discuss the method of setting a more analytical and detailed goal-oriented treatment planning for the target position of the anterior crown and root from the initial treatment planning stage.
Learning objective
  1. Understanding the considerations necessary for planning the location of the roots during orthodontic treatment.
  2. Understanding long-term changes in root position and controlling factors that affect long-term stability.