To investigate the changes of facial soft tissue asymmetry over time after orthognathic surgery in Class III patients, using three-dimensional (3-D) stereophotogrammetry. The study included 101 patients with skeletal Class III malocclusion (72 females, 29 males; age range 19-53 years; mean age 28.6 years), who underwent orthognathic surgery. The mean follow-up was at least 12 months. 3-D photographs were acquired using the 3dMDtrio (3dMD, Atlanta, GA) stereophotogrammetric system. 21 anthropometric landmark positions were evaluated at 3 time points: before (T0), 6 months (T1) and 12 months (T2) after surgery by superimposing the 3-D photographs. The facial asymmetry were assessed and classified as follows: 0-2 mm (mild); 2-5 mm (moderate); more than 5 mm (severe). The changes were compared between gender, type of surgery, 5 facial regions and time of image taking. The face asymmetry showed significant differences in relation to the average distance (AD) before surgery (T0 - median 0.73) and 6 months after the surgery (T1- median 0.64; p< 0.012). No statistical difference was between T0 and 12 months after surgery (T2) (p> 0.146). The Chin Volume Asymmetry Index (CVAI) between all 3 time points was statistically different (p<0.05), but no differences were found between gender or surgery type groups (p>0.05). The asymmetry of facial soft tissues significantly decreased after orthognathic surgery. However, there was a tendency for soft tissue asymmetry to return after 6 months, but not at the same level.
- 3.4. Other publications in conference proceedings (including local)