One of the orthodontics physiological mechanism is periodontal ligament in response to orthodontic forces to make the teeth movement, the biomechanical properties of periodontal ligament(PDL) directly affect the structure, function and health of periodontal tissue, and is closely related to the process of orthodontic treatment, but about the biomechanics of PDL in the orthodontic process of the domestic study is less, so in this paper, the research progress on periodontal ligament biomechanics were reviewed.
