Three-dimensional evaluation of changes in lip position from before to after orthodontic appliance removal. Lindsey Eidson, Lucia H.S. Cevidanes, Leonardo Koerich de Paula, H. Garland Hershey, Gregory Welch, P. Emile Rossouw
Article: Three-dimensional evaluation of changes in lip position from before to after orthodontic appliance removal.
Authors: Lindsey Eidson, Lucia H.S. Cevidanes, Leonardo Koerich de Paula, H. Garland Hershey, Gregory Welch, P. Emile Rossouw
Source: American Journal of Orthodontics & Dentofacial Orthopedics; Volume 142, Issue 3 , pp 410-418.
Date: September 2012
Introduction: Our objectives were to develop a reproducible method of superimposing 3-dimensional images for measuring soft-tissue changes over time and to use this method to document changes in lip position after the removal of orthodontic appliances.
Methods: Three-dimensional photographs of 50 subjects were made in repose and maximum intercuspation before and after orthodontic appliance removal with a stereo camera. For reliability assessment, 2 photographs were repeated for 15 patients. The images were registered on stable areas, and surface-to-surface measurements were made for defined landmarks.
Results: Mean changes were below the level of clinical significance (set at 1.5 mm). However, 51% and 18% of the subjects experienced changes greater than 1.5 mm at the commissures and lower lips, respectively.
Conclusions: The use of serial 3-dimensional photographs is a reliable method of documenting soft-tissue changes. Soft-tissue changes after appliance removal are not clinically significant; however, there is great individual variability.